Edited Books
H.W. Choi, 'Handbook of Optical Microcavities', Pan Stanford Publishing, ISBN 978-9-81446-324-9, (August 2014).

Book Chapters

(1)   K.H. Li and H.W. Choi, "Photonic Crystal Light-Emitting Diodes by Nanosphere Lithography", in 'Handbook of Solid-state Lighting and LEDs", edited by Zhe Chuan Feng, Taylor and Francis (2017).

 

(2)   H.W. Choi, 'Light-emitting Diode Technologies", in 'Handbook of Semiconductor Lasers and Diode-based Light Sources in Biophotonics", edited by Peter Andersen and Paul Michael Petersen, The Institution of Engineering and Technology (2017).

 

(3)   K.H. Li and H.W. Choi, 'Nanosphere-patterned Gallium Nitride Optical Microcavities', in 'Handbook of Optical Microcavities', edited by H.W. Choi, Pan Stanford Publishing, ISBN 978-9-81446-324-9, (September 2014).

 

(4)   Z.T. Ma, Y.F. Cheung and H.W. Choi, 'Colour Tuneable LEDs", in 'Nitride semiconductor light-emitting diodes (LEDs): Materials, performance and applications", edited by J.J. Huang, H.C. Kuo and S.C. Chen, Woodhead Publishing, ISBN 978-0-85709-507-7, (January 2014).

 

(5)   H.W. Choi, 'Nitride Microdisplay and Micro-scale Light Emitting Diodes", in 'III-Nitride Devices and Nano-Engineering", edited by Zhe Chuan Feng, Imperial College Press, ISBN 978-1-84816-223-5 (August 2008).



Patents
(a) Granted

(1)           'White nanoLED Without Requiring Color Conversion" US Patent 9,401,453 (July 2016).

 

(2)           '칩 적층 방법 (Chip Stacking)", Korean Patent 10-1622930-0000 (May 2016).

 

(3)           '半导体颜色可调谐宽带光源和全色微显示器 (Semiconductor Color-tunable Broadband Light Sources and Full-Color Microdisplays)", Chinese Patent ZL 2009 8 0139766.5 (March 2013).

 

(4)           '반도체의 색 조절가능한 광대역 광원 및 풀 컬러 마이크로디스플레이 (Semiconductor Color-tunable Broadband Light Sources and Full-Color Microdisplays)", Korean Patent 10-1207796-0000 (November 2012).

 

(5)           'Semiconductor Color-tunable Broadband Light Sources and Full-Color Microdisplays" US Patent 7,982,228 (July 2011).

 

(6)           '制作白光LED和颜色连续可调LED的方法(Method of making white light LEDs and continuously wavelength tunable LEDs)", Chinese patent ZL 2007 8 002814.1 (November 2010).

 

(7)           'Micro-LEDs", US Patent 7,598,149 (October 2009).


(b) Pending
(8) 'Flexible GaN Light-emitting Diodes', US Patent Application 14/831,300.

(9) 'Chip Stacking', US Patent Application 13/506,839.

Journal Articles    ISI Total cites: 1375; h-index: 21

(1)           X.H. Zhang, C.H. To and H.W. Choi, 'Optically-free-standing InGaN Microdisks with Metallic Reflector", Japanese Journal of Applied Physics (2017).  [IF : 1.122]

 

(2)           L.N. Liu, H.W. Choi, J.P. Xu and P.T. Lai, 'Effects of Y incorporation in TaON gate dielectric on electrical performance of GaAs metal-oxide-semiconductor capacitor", Physica Status Solidi- Rapid Research Letters (2016). [IF : 2.578]

 

(3)           Y.F. Cheung, K.H. Li and H.W. Choi, 'Flexible free-standing III-nitride thin-films for emitters and displays", ACS Applied Materials & Interfaces 8, 21440 (2016). [IF : 7.145]

 

(4)           Y.Y. Zhang, J.A. Huang, K.H. Li, D. Bai, Y. Wang, T. Wang and H.W. Choi, 'Influence of Strain on Emission from GaN-on-Si microdisks", Journal of Physics D: Applied Physics 37, 375103 (2016).  [IF : 2.58]

 

(5)           C. Feng, J.A. Huang and H.W. Choi, 'Monolithic Broadband Light-emitting Diode", ACS Photonics 3, 1294 (2016).  [IF : 5.404]

 

(6)           X.H. Zhang, H.W. Choi, 'GaN Nano-cones Prepared by Jet-printed Nanospheres Arrays", IEEE Transactions on Nanotechnology 15, 423 (2016).  [IF : 1.702]

 

(7)           K.H. Li, Y.F. Cheung, C.W. Tang, C. Zhao, K.M. Lau and H.W. Choi, 'Optical Crosstalk Analysis of Micro-pixelated GaN-based Light-emitting Diodes on Sapphire and Si Substrates", Physics Status Solidi (a) 213, 1193 (2016).  [IF : 1.648]

 

(8)           Y. Zhang, C. Feng, T. Wang and H.W. Choi, 'GaN Hemispherical Micro-cavities", Applied Physics Letters (2016) 108, 031110 (2016).  [IF : 3.142]

 

(9)           L.N. Liu, H.W. Choi, J.P. Xu and P.T. Lai, 'Passivation of Oxide Traps and Interface States in GaAs Metal-Oxide-Semiconductor Capacitor by LaTaON Passivation Layer and Fluorine Incorporation", Applied Physics Letters 107, 213501 (2015).  [IF : 3.142/ Cited: 1]

 

(10)         K.H. Li, Y.F. Cheung, W.S. Cheung and H.W. Choi, 'Confocal microscopic analysis of optical crosstalk in GaN micro-pixel light-emitting diodes", Applied Physics Letters 107, 171103 (2015).  [IF : 3.142/ Cited : 2]

 

(11)         L.N. Liu, H.W. Choi, P.T. Lai and J.P. Xu, 'Passivation of oxide traps in GaAs metal-oxide-semiconductor capacitor with high-k dielectric by using fluorine incorporation", Journal of Vacuum Science and Technology B 33, 050601 (2015).  [IF : 1.398/ Cited : 1]

 

(12)         W.S. Cheung, Y.F. Cheung, H.T. Chen, R.S.Y. Hui, E. Waffenschmidt and H.W. Choi, 'InGaN Light-emitting Diode Stripes with Reduced Luminous Exitance", OSA Optics Express 23, 15021 (2015).  [IF : 3.148/ Cited: 1]

 

(13)         K.H. Li, Y.F. Cheung and H.W. Choi, 'Whispering Gallery Mode Lasing in Optically-isolated III-Nitride Nano-Rings", OSA Optics Letters 40, 2564 (2015).  [IF : 3.040]

 

(14)         H.T. Chen, Y.F. Cheung, H.W. Choi, S.C. Tan and S.Y.R. Hui, 'Reduction of Thermal Resistance and Optical Power Loss Using Thin-Film Light-Emitting Diode (LED) Structure", IEEE Transactions on Industrial Electronics 62, 6925 (2015). [IF : 6.383]

 

(15)         Y. Zhang, X. Zhang, K.H. Li, Y.F. Cheung, C. Feng and H.W. Choi, 'Advances in III-nitride Semiconductor Microdisk Lasers", Feature Article, Physica Status Solidi (a), 212, 960 (2015).  [IF : 1.648/ Cited: 3]

 

(16)         X. Wang, M. Yuan, X. Xiong, M. Chen, M. Qin, L. Qiu, H. Lu, G. Zhang, G. Lv and A.H.W. Choi, 'Process Optimization for Inkjet Printing of Triisopropylsilylethynyl Pentacene with Single-solvent Solutions", Thin Solid Films 578, 11 (2015).  [IF : 1.76]

 

(17)         X.H. Zhang, Y.F. Cheung, Y.Y. Zhang and H.W. Choi, 'Whispering-gallery Mode Lasing from Free-standing InGaN Microdisks", OSA Optics Letters 39, 5614 (2014).  [IF : 3.040/ Cited: 9]

 

(18)         C. Feng and H.W. Choi, 'Density-tunable non-close-packed monolayer of silica nanospheres prepared by single-step freeze-drying", Journal of Vacuum Science and Technology B 32, 051805 (2014).  [IF : 1.398]

 

(19)         Y.F. Cheung, K.H. Li, R.S.Y. Hui and H.W. Choi, 'Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes", Applied Physics Letters 105, 071104 (2014).  [IF : 3.142/ Cited : 2]

 

(20)         Y.Y. Zhang, Z.T. Ma, X.H. Zhang, T. Wang and H.W. Choi, 'Optically-pumped whispering-gallery mode lasing from 2-micron GaN micro-disks pivoted on Si", Applied Physics Letters 104, 221106 (2014).  [IF : 3.142/ Cited : 6]

 

(21)         K.H. Li, C. Feng, H.W. Choi, 'Analysis of Micro-lens Integrated Flip-chip InGaN Light-emitting Diodes by Confocal Microscopy", Applied Physics Letters 104, 051107 (2014).  [IF : 3.142/ Cited : 6]

 

(22)         K.H. Li, K.Y. Zang, S.J. Chua and H.W. Choi, 'Embedding nano-pillar arrays into InGaN light-emitting diodes', Physica Status Solidi (c) 11, 742 (2014). 

 

(23)         G. Chen, H.W. Choi, P.T. Lai and W.M. Tang, 'A Schottky-diode hydrogen sensor based on InGaN/GaN multiple quantum wells", Journal of Vacuum Science and Technology B 32, 011212 (2014).  [IF : 1.398]

 

(24)         Z. Yue, Y.F. Cheung, H.W. Choi, Z. Zhao, B.Z. Tang and K.S. Wong, 'Hybrid GaN/Organic white light emitters with aggregation induced emission organic molecule", Optical Materials Express 3, 1906 (2013).  [IF : 2.657/ Cited : 3]

 

(25)         K.H. Li, K.Y. Zang, S.J. Chua and H.W. Choi, 'III-nitride Light-emitting Diode with Embedded Photonic Crystals", Applied Physics Letters 102, 181117 (2013).  [IF : 3.142/ Cited : 8]

 

(26)         K.H. Li, Q. Zhang and H.W. Choi, '1-Ám Micro-lens Array on Flip-chip Light-emitting Diodes", Japanese Journal of Applied Physics 52, 08JH08 (2013).  [IF : 1.122]

 

(27)         K.H. Li, Y.F. Cheung, Q. Zhang and H.W. Choi, 'Optical and Thermal Analyses of Thin-Film Hexagonal Micro-Mesh Light-Emitting Diodes", IEEE Photonics Technology Letters 25, 374 (2013).  [IF : 1.945/ Cited: 5]

 

(28)         Y.F. Cheung and H.W. Choi, 'Color-tunable and Phosphor-free White-light Multi-layered Light-emitting Diodes", IEEE Transactions on Electron Devices 60, 333 (2013).  [IF : 2.207/ Cited: 6]

 

(29)         Q. Zhang, K.H. Li and H.W. Choi, 'Polarized emission from InGaN light-emitting diodes with self-assembled nanosphere coatings" IEEE Photonics Technology Letters 24, 1642 (2012).  [IF : 1.945/ Cited: 4]

 

(30)         L.F. Deng, Y.R. Liu, H.W. Choi, C.M. Che and P.T. Lai, 'Improved Performance of Pentacene OTFTs with HfLaO Gate Dielectric by Using Fluorination and Nitridation",  IEEE Transactions on Device and Materials Reliability 12, 107 (2012).  [IF : 1.437/ Cited: 2]

 

(31)         K.H. Li, Z.T. Ma and H.W. Choi, 'Tunable clover-shaped GaN photonic bandgap structures patterned by dual-step nanosphere lithography", Applied Physics Letters 100 141101 (2012). [IF : 3.142/ Cited : 9]

 

(32)         Q. Zhang, K.H. Li and H.W. Choi, 'InGaN light-emitting diodes with indium-tin-oxide sub-micron lenses patterned by nanosphere lithography", Applied Physics Letters 100, 061120 (2012). [IF : 3.142/ Cited: 22]

 

(33)         L.F. Deng, Y.R. Liu, H.W. Choi, J.P. Xu, C.M. Che and P.T. Lai, 'Effects of Annealing Temperature and Gas on Pentacene OTFTs with HfLaO as Gate Dielectric", IEEE Transactions on Device and Materials Reliability 12, 107 (2012).  [IF : 1.437/ Cited: 2]

 

(34)         S.Y. Huang, W.C. Chew, Y.G, Liu, B.-I. Wu and H.W. Choi, 'A Pancake-shaped Nano-aggregate for Focusing Surface Plasmons", Journal of Applied Physics 111, 034308 (2012).  [IF : 2.101/ Cited: 2]

 

(35)         K.H. Li, Zetao Ma and H.W. Choi, 'Single-mode Whispering Gallery Lasing from Metal-clad GaN Nano-pillars", OSA Optics Letters 37, 374 (2012).  [IF : 3.040/ Cited: 8]

 

(36)         X.H. Wang, J.Q. Ning, S.J. Xu and H.W. Choi, 'Raman and photoluminescence characterization of focused ion beam patterned InGaN/GaN multi-quantum-wells nanopillar array", Journal of Applied Physics 110, 093111 (2011).   [IF : 2.101/ Cited: 5]

 

(37)         L. Zhu, S.Y. Huang, P.T. Lai and H.W. Choi, 'Fiber-coupled Light-emitting Diode with a Capillary-bonded Hemispherical Lens", IEEE Photonics Technology Letters 23, 1859 (2011).  [IF : 1.945/ Cited: 2]

 

(38)         K.H. Li and H.W. Choi, 'InGaN light-emitting diodes with Indium-Tin-Oxide photonic crystal current-spreading layer", Journal of Applied Physics 110, 053104 (2011).   [IF : 2.101/ Cited: 19]

(39)         L. Zhu, P.T. Lai and H.W. Choi, 'Microlens Array on Flip-chip LED Patterned with an Ultraviolet Micro-pixelated Emitter", IEEE Photonics Technology Letters 23, 1067 (2011).  [IF : 1.945/ Cited: 5]

 

(40)         G.Y. Mak, L. Zhu, Z. Ma, S. Huang, E.Y. Lam and H.W. Choi, 'Plasmonically-enhanced quantum-dot white-light InGaN light-emitting diode", Journal of Physics D: Applied Physics 44, 224016 (2011).  [IF : 2.58/ Cited :3]

 

(41)         K.H. Li, Z.T. Ma and H.W. Choi, 'High-Q whispering-gallery mode lasing from nanosphere-patterned GaN nano-ring arrays", Applied Physics Letters 98, 071106 (2011).  [IF : 3.142/ Cited: 10]

 

(42)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Liquid-immersion Laser Micromachining of GaN Grown on Sapphire", Applied Physics A 102, 441 (2011).  [IF : 1.444/ Cited: 9]

 

(43)         K.H. Li and H.W. Choi, 'Tuning of photonic bandgap via dimensional control of nanopillars", Physica Status Solidi (c) 8, 2351 (2011).  [Cited: 1]

 

(44)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Liquid-immersion Laser Micromachining of GaN Trenches and its Applications in Device Fabrication", Physica Status Solidi (c) 8, 2229 (2011).

 

(45)         Z.L. Li, K.H. Li and H.W. Choi, 'Reliability Study on Micro-structured InGaN Light-emitting Diodes", Physica Status Solidi (c) 8, 2258 (2011).

 

(46)         K.H. Li and H.W. Choi, 'Air-spaced GaN nanopillar photonic bandgap structures patterned by nanosphere lithograpy", Journal of Applied Physics 109, 023107 (2011).  [IF : 2.101/ Cited: 23]

 

(47)         L. Zhu, Z.T. Ma, P.T. Lai and H.W. Choi, 'Vertically-mounted InGaN-on-Sapphire Light-emitting Diodes", IEEE Transactions on Electron Devices 58, 490 (2011).  [IF : 2.207/ Cited: 2]

 

(48)         L.F. Deng, P.T. Lai, W.B. Chen, J.P. Xu, Y.R. Liu, H.W. Choi and C.M. Che, 'Effects of Different Annealing Gases on Pentacene OTFT with HfLaO Gate Dielectric", IEEE Electron Device Letters 32, 93 (2011).  [IF : 2.528/ Cited: 15]

 

(49)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Interconnected alternating-current light-emitting diode arrays isolated by laser micromachining", Journal of Vacuum Science and Technology 29, 011025 (2011).  [IF : 1.398/ Cited : 2]

 

(50)         Z.L. Li, K.H. Li and H.W. Choi, 'Mechanism of Optical Degradation in micro-structured InGaN Light-emitting Diodes", Journal of Applied Physics 108, 114511 (2010).  [IF : 2.101/ Cited : 7]

 

(51)         X.H. Wang, P.T. Lai and H.W. Choi, 'The contribution of sidewall light extraction to efficiencies of polygonal LEDs shaped with laser micro-machining", Journal of Applied Physics 108, 023110 (2010).  [IF : 2.101/ Cited : 9]

 

(52)         R. Chen, H.D. Sun, T. Wang, K.N. Hui and H.W. Choi, 'Optically-pumped Ultraviolet Lasing from Nitride Nanopillars at Room Temperature", Applied Physics Letters 96, 241101 (2010).  [IF : 3.142/ Cited : 30]

 

(53)         Z.L. Li, P.T. Lai and H.W. Choi, 'Failure Analysis of InGaN/GaN LEDs with Emission Wavelength between 440 nm and 550 nm", Physica Status Solidi (c) 7, 2202 (2010).

 

(54)         X.H. Wang, P.T. Lai and H.W. Choi, 'Design and Performance of LEDs with Circular Geometry", Physica Status Solidi (c) 7, 2144 (2010).

 

(55)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Deep Etch of GaN by Laser Micromachining", Physica Status Solidi (c) 7, 2151 (2010).  [Cited: 3]

 

(56)         L. Zhu, P.T. Lai and H.W. Choi, 'An Ultraviolet micro-LED Array and its Application for Microlens Fabrication", Physica Status Solidi (c) 7, 2174 (2010).

 

(57)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Precision Laser Micromachining of Trenches in GaN-on-sapphire", Journal of Vacuum Science and Technology 28, 380 (2010).   [IF : 1.398/ Cited : 9]

 

(58)         Z.L. Li, P.T. Lai and H.W. Choi, 'Reliability Study on Green InGaN/GaN Light-emitting Diodes", Journal of Physics: Conference Series 209, 012065 (2010).  [Cited: 2]

 

(59)         W.Y. Fu, K.Y.Y. Wong and H.W. Choi, 'Room Temperature Photonic Crystal Band-edge Lasing from Nanopillar Array on GaN patterned by Nanosphere Lithography", Journal of Applied Physics 107, 063104 (2010).   [IF : 2.101/ Cited : 10]

 

(60)         L. Zhu, X.H. Wang, P.T. Lai and H.W. Choi, 'Angularly-uniform White Light-emitting Diodes Using and Integrated Reflector Cup," IEEE Photonics Technology Letters 22, 513 (April 2010).  [IF : 1.945/ Cited: 12]

 

(61)         X.H. Wang, W.Y. Fu, P.T. Lai and H.W. Choi, 'Evaluation of InGaN/GaN Light-emitting Diodes of Circular Geometry", OSA Optics Express 17, 22311 (2009).   [IF : 3.148/ Cited: 22]

 

(62)         Z.L. Li, S. Tripathy, P.T. Lai and H.W. Choi, 'Effect of Indium Content on Performance and Reliability of InGaN/GaN Light-emitting Diodes", Journal of Applied Physics 106, 094507 (2009).  [IF : 2.101/ Cited : 2]

 

(63)         W.Y. Fu, K.K.Y. Wong and H.W. Choi, 'Closed-packed Hemi-ellipsoid Arrays: A Photonic Bandgap Structure Patterned by Nanosphere Lithography", Applied Physics Letters 95, 133125 (2009).  [IF : 3.142/ Cited : 22]

 

(64)         Z.L. Li, P.T. Lai and H.W. Choi, 'A Reliability Study on Green InGaN/GaN Light-emitting Diodes", IEEE Photonics Technology Letters 21, 1429 (2009).  [IF : 1.945/ Cited: 19]

 

(65)         Q. Chen, H.W. Choi and N. Wong, 'Robust Simulation Methodology for Surface Roughness Loss in Interconnect and Package Modelings", IEEE Transcations on CAD 28, 1654 (2009).  [IF : 1.181/ Cited: 5]

 

(66)         K.N. Hui, X.H. Wang, Z.L. Li, P.T. Lai and H.W. Choi, 'Design of Vertically-stacked Polychromatic Light-emitting Diodes", OSA Optics Express 17, 9873 (2009).  [IF : 3.148/ Cited: 9 (71 in Google Scholar, mainly by patents)]

 

(67)         W.Y. Fu, K.N. Hui, X.H. Wang, K.K.Y. Wong, P.T. Lai and H.W. Choi, 'Geometrical Shaping of InGaN Light-emitting Diodes by Laser Micromachining", IEEE Photonics Technology Letters 21, 1078 (2009).  [IF : 1.945/ Cited: 17]

 

(68)         L. Zhu, C.W. Ng, N. Wong, K.K.Y. Wong, P.T. Lai and H.W. Choi, 'Pixel-to-pixel Fiber-coupled Emissive Micro-light-emitting Diode Arrays", IEEE Photonics 1,1 (2009).  [IF : 2.177/ Cited: 27]

 

(69)         X.H. Wang, P.T. Lai and H.W. Choi, 'Laser-micromachining of Optical Microstructures with Inclined Sidewall Profile", Journal of Vacuum Science and Technology B 27, 1048 (2009).  [IF : 1.398/ Cited : 11]

 

(70)         K.N. Hui, P.T. Lai and H.W. Choi, 'Vertically-stacked color-tunable LEDs", Physica Status Solidi (c) 6, S902 (2009).  [Cited: 2]

 

(71)         G.Y. Mak, W.Y. Fu, E.Y. Lam and H.W. Choi, 'Metallic Nanoparticle Array on GaN by microsphere lithography", Physica Status Solidi (c) 6, S654 (2009).  [Cited: 9]

 

(72)         W.Y. Fu, K.K.Y. Wong and H.W. Choi, 'A Novel GaN Photonic Crystal Structure Comprising Nanopillars with Inclined Sidewalls", Physica Status Solidi (c) 6, S639 (2009).  [Cited:2]

 

(73)         K.N. Hui, Y.F. Fu, W.N. Ng, C.H. Leung, P.T. Lai, K.K.Y. Wong and H.W. Choi, 'Polychromatic Light-emitting Diodes with a Fluorescent Nanosphere Opal Coating", Nanotechnology 19, 355203 (2008).  [IF : 3.573/ Cited : 12]

 

(74)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Photonic Crystal Light-emitting Diodes Fabricated by Microsphere Lithography", Nanotechnology 19, 255302 (2008). [IF : 3.573/ Cited : 37]

 

(75)         K.N. Hui, P.T. Lai and H.W. Choi, 'Spectral Conversion with fluorescent microspheres for light emitting diodes", OSA Optics Express 16, 13 (2008).  [IF : 3.148/ Cited: 10]

 

(76)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Nanostructuring GaN using Microsphere Lithography", Journal of Vacuum Science and Technology B 26, 76 (2008).  [IF : 1.398/ Cited : 7]

 

(77)         K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Polychromatic Emission from Fluorescent-Microsphere- Coated LEDs", Physica Status Solidi 5, 2201 (2008).

 

(78)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Micro-pixel Light Emitting Diodes with Wavelength-tunable Output", Physica Status Solidi 5, 2198 (2008).

 

(79)         W.N. Ng, X.H. Wang, C.H. Leung, P.T. Lai and H.W. Choi, 'Nanopatterning GaN with Microspheres", Physica Status Solidi 5, 1615 (2008). 

 

(80)         H.W. Choi, B.L. Yang, P.T. Lai, P. Chen and S.J. Chua, 'GaN-MQW Microdisks Pivoted on Si Substrate", Physica Status Solidi (a) 204, 272 (2007).  [IF : 1.648]

 

(81)         H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, J.H. Teng, S. Tripathy and S.J. Chua, 'Stimulated Emission from Free-standing GaN/Si Microdisk Structures", Physica Status Solidi (c) 4, 2358 (2007).

 

(82)         H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, S. Tripathy, J.H. Teng and S.J. Chua, 'Lasing in GaN Microdisks Pivoted on Si", Applied Physics Letters 89, 211101 (2006).   [IF : 3.142/ Cited : 44]

 

(83)         H.W. Choi and S.J. Chua, 'Honeycomb GaN Micro-light-emitting Diodes", Journal of Vacuum Science and Technology B 24, 800 (2006).  [IF : 1.398/ Cited : 13]

 

(84)         H.W. Choi and S.J. Chua, 'Hexagonally-closed-packed Micro-light-emitting Diodes", Physica Status Solidi (c) 3, 2219 (2006).

 

(85)         C.-L. Lee, H.W. Choi, E. Gu and M.D. Dawson, 'Fabrication and Characterization of Diamond Micro-optics", Diamond and Related Materials 15, 725 (2006).  [IF : 2.125/ Cited : 23/ Contribution: 25%]

 

(86)         H.W. Choi, E. Gu, C. Liu, C. Griffin, J.M. Girkin and M.D. Dawson, 'Fabrication of Natural Diamond Microlenses by Plasma Etching", Industrial Diamond Review 65, 29 (2005).

 

(87)         H.W. Choi and M.D. Dawson, 'Improved Current Spreading in 370 nm AlGaN Micro-ring Light Emitting Diodes", Applied Physics Letters 85, 053504 (2005).  [IF : 3.142/ Cited : 8]

 

(88)         H.W. Choi, C.W. Jeon, M.D. Dawson, P.R. Edwards, R.W. Martin, S. Tripathy and S.J. Chua, 'InGaN Nano-ring Structures for High-efficiency LEDs", Applied Physics Letters 86, 021101 (2005).  [IF : 3.142/ Cited : 27]

 

(89)         H.W. Choi, E. Gu, C. Liu, J.M. Girkin and M.D. Dawson, 'Fabrication and Evaluation of GaN Negative and Bifocal Microlenses", Journal of Applied Physics 97, 063101 (2005). [IF : 2.101/ Cited : 17]

 

(90)         C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, G. McConnell, J.M. Girkin and M.D. Dawson, 'Beam Divergence Measurements of InGaN/GaN Micro-arrayed Light-emitting Diodes Using Confocal Microscopy", Applied Physics Letters 86, 041111 (2005).  [IF : 3.142/ Cited : 23]

 

(91)         H.W. Choi, E. Gu, C. Liu, C. Griffin, J.M. Girkin and M.D. Dawson, 'Fabrication of Natural Diamond Microlenses by Plasma Etching", Journal of Vacuum Science and Technology B 23, 130 (2005).  [IF : 1.398/ Cited : 26]

 

(92)         H.W. Choi, C.W. Jeon and M.D. Dawson, 'Tapered-sidewall Dry Etching for GaN and its Applications in Device Fabrication", Journal of Vacuum Science and Technology B 23, 99 (2005). [IF : 1.398/ Cited : 12]

 

(93)         H.W. Choi, C. Liu, M.G. Cheong, J. Zhang and S.J. Chua, 'Exposure of Defects in GaN by Plasma Etching", Applied Physics A 80, 405 (2005).  [IF : 1.444/ Cited : 9]

 

(94)         H.W. Choi and M.D. Dawson, 'Enhanced areal efficiency from 370 nm AlGaN micro-ring light emitting diodes', Physica Status Solidi (c) (2005).

 

(95)         H.W. Choi, E. Gu, J.M. Girkin and M.D. Dawson, 'Nitride micro-display with integrated micro-lenses', Physica Status Solidi (c) (2005).

 

(96)         H.W. Choi, C.W. Jeon and M.D. Dawson, 'High-resolution 128x96 Nitride Microdisplay", IEEE Electron Device Letters 25, 277 (2004).  [IF : 2.528/ Cited : 30]

 

(97)         C.W. Jeon, H.W. Choi, E. Gu and M.D. Dawson, 'High-density, Matrix-addressable AlInGaN-based 368 nm Micro-array Light-emitting Diodes", IEEE Photonics Technology Letters 16, 2421 (2004). [IF : 1.945/ Cited: 36]

 

(98)         H.W. Choi, C. Liu, E. Gu, G. McConnell, J.M. Girkin, I.M. Watson and M.D. Dawson, 'GaN micro-Light Emitting Diode Arrays with Monolithically-integrated Sapphire micro-lenses", Applied Physics Letters 84, 2253 (2004).  [IF : 3.142/ Cited : 86]

 

(99)         J.M. Girkin, E. Gu, C. Griffin, H.W. Choi, M.D. Dawson and G. McConnell, 'Use of Confocal and Multiphoton Microscopy for the Evaluation of Micro-optical Components and Emitters", Microscopy Research and Techniques 64, 293 (2004).  [IF : 1.130/ Cited: 1]

 

(100)       E. Gu, H.W. Choi, G. McConnell, C. Liu, C. Griffin, J.M. Girkin, I.M. Watson, and M.D. Dawson, 'Reflection / Transmission Confocal Microscopy Characterisations of Single Crystal Diamond Microlens Arrays", Applied Physics Letters 84, 2754 (2004).  [IF : 3.142/ Cited : 44]

 

(101)       H.W. Choi, C.W. Jeon and M.D. Martin, 'Fabrication of Matrix-addressable Micro-LED Arrays Based on a Novel Etch Technique" Journal of Crystal Growth 268, 527 (2004).  [IF : 1.462/ Cited: 13]

 

(102)       E. Gu, C.W. Jeon, H.W. Choi, G. Rice, M.D. Dawson, E.K. Illy and M.R.H. Knowles, 'Micromachining and dicing of sapphire, gallium nitride and micro-LED devices with UV copper vapour laser", Thin Solid Films 453, 462 (2004).  [IF : 1.761/ Cited: 27]

 

(103)       H.W. Choi, P.R. Edwards, C.W. Jeon, R.W. Martin, M.D. Dawson, S. Tripathy and S.J. Chua, 'Sub-micron InGaN Ring Structures for High-efficiency LEDs", Physica Status Solidi (c) 1, 202 (2004).

 

(104)       H.W. Choi, C.W. Jeon and M.D. Dawson, 'InGaN Microring Light Emitting Diodes", IEEE Photonics Technology Letters 16, 33 (2004).  [IF : 1.945/ Cited: 18]

 

(105)       H.W. Choi, P.R. Edwards, R.W. Martin and M.D. Dawson, 'High Extraction Efficiency InGaN Micro-ring Light Emitting Diodes", Applied Physics Letters 83, 4483 (2003).   [IF : 3.142/ Cited : 74]

 

(106)       M.A. Rana, T. Osipowicz, H.W. Choi, M.B.H. Breese and S.J. Chua, 'A Study of the material loss and other processes involved during annealing of GaN at growth temperatures", Chemical Physics Letters 380, 105 (2003).  [IF : 1.860/ Cited: 20]

 

(107)       H.W. Choi, C.W. Jeon and M.D. Dawson, 'InGaN Light Emitting Diodes of Micro-ring Geometry", Physica Status Solidi (c) 0, 2185 (2003).

 

(108)       H.W. Choi, C.W. Jeon and M.D. Dawson, 'Low Resistivity p-type Contacts to GaN by Plasma Treatments", Physica Status Solidi (c) 0, 2210 (2003).

 

(109)       C.W. Jeon, H.W. Choi and M.D. Dawson, 'A Novel Fabrication Method for a 64x64 Matrix-addressable GaN-based micro-LED Array", Physica Status Solidi (a) 200, 79 (2003). [IF : 1.648/ Cited :7]

 

(110)       C.W. Jeon, H.W. Choi and M.D. Dawson, 'Fabrication of Matrix-addressable InGaN-based Microdisplays of High Array Density", IEEE Photonics Technology Letters 15, 1516 (2003).  [IF : 1.945/ Cited: 21]

 

(111)       H.W. Choi, M.G. Cheong, M. Rana, S.J. Chua, T. Osipowicz and J.S. Pan, 'Rutherford Backscattering Analysis of GaN Decomposition", Journal of Vacuum Science and Technology B 21, 1080 (2003).  [IF : 1.398/ Cited : 9]

 

(112)       M.A. Rana, T. Osipowicz, H.W. Choi, M.B.H. Breese, F. Watt and S.J. Chua, 'Stoichiometric and Structural Alterations in GaN Thin Films during Annealing", Applied Physics A 77, 103 (2003).  [IF : 1.444/ Cited : 11]

 

(113)       H.W. Choi, C.W. Jeon, M.D. Martin, P.R. Edwards, R.W. Martin and S. Tripathy, 'Mechanism of Enhanced Light Output Efficiency in InGaN-based Micro-light Emitting Diodes", Journal of Applied Physics 93, 5978 (2003).  [IF : 2.101/ Cited : 54]

 

(114)       H.W. Choi, C.W. Jeon, M.D. Martin, P.R. Edwards and R.W. Martin, 'Fabrication and Performance of Parallel-addressed InGaN Micro-LED Arrays", IEEE Photonics Technology Letters 15, 510 (2003).  [IF : 1.945/ Cited: 36]

 

(115)       M.G. Cheong, C.W. Liu, H.W. Choi, B.K. Lee, E.ľK. Suh and H.J. Lee, 'Study of Luminescent Origin in High Indium Content Composition InGaN/GaN Quantum Wells" Journal of Applied Physics 93, 4691(2003).  [IF : 2.101/ Cited : 16/ Contribution: 20%]

 

(116)       H.W. Choi, M. Rana, S.J. Chua, T. Osipowicz and J.S. Pan, 'Surface Analysis of GaN Decomposition", Semiconductor Science Technology 17, 1223 (2002).  [IF : 2.098/ Cited : 20]

 

(117)       H.W. Choi, S.J. Chua and S. Tripathy, 'Morphological and Structural Analyses of Plasma-Induced Damage to n-type GaN", Journal of Applied Physics 92, 4381 (2002).  [IF : 2.101/ Cited : 11]

 

(118)       H.W. Choi, J. Zhang and S.J. Chua, 'Dislocation Scattering in n-type GaN", Material Science in Semiconductor Processing 4, 567 (2001).  [IF : 2.264/ Cited : 8]

 

(119)       S.J. Chua, H.W. Choi, J. Zhang and P.Li, 'Vacancy Effects on Plasma-Induced Damage to n-GaN", Physical Review B 64, 205302 (2001).  [IF : 3.718/ Cited : 20]

 

(120)       H.W. Choi and S.J. Chua, 'The Link Between Gallium Vacancies and Plasma Damage to n-GaN", Physica Status Solidi (a) 188, 393 (2001).  [IF : 1.648/ Cited :2]

 

(121)       H.W. Choi, X.J. Kang and S.J. Chua, 'Surface Modification and Ohmic Contact Formation to n- and p-type GaN", Physica Status Solidi (a) 188, 399 (2001).  [IF : 1.648/ Cited :9]

 

(122)       H.W. Choi, S.J. Chua, A. Raman, J.S. Pan, A.T.S. Wee, 'Plasma-Induced Damage to n-type GaN", Applied Physics Letters 77, 1795 (2000).   [IF : 3.142/ Cited : 63]



Invited Papers/ Talks
(1) H.W. Choi, 'Novel LED Geometries Enabled by Advanced Laser Processes', International Conference on Materials for Advanced Technologies 2015, Singapore (June 2015).

(2) H.W. Choi, 'Novel LED Geometries Enabled by Advanced Laser Processes', The 3rd International Conference on Light-emitting Devices and Their Industrial Applications, Yokohama, Japan (April 2015).

(3) H.W. Choi, 'Color-tunable Light-emitting Diodes for Lighting and Display', LED Technology Forum, SEMICON Singapore 2014, Singapore (April 2014).

(4) H.W. Choi, 'III-Nitride Light-emitting Diodes Incorporating Nanosphere-patterned Nanophotonic Structures', 2nd International Conference on Advanced Electromaterials, Jeju, South Korea (November 2013).

(5) K.M. Lau, H.W. Choi, W.H. Ki, R.S.W Lee, P.K.T. Mok, J.K.O. Sin and C.P. Yue, 'Cost-effective and Eco-friendly LED System-on-a-Chip', ChinaSSL 2013, Beijing, China (Nov 2013).

(6) H.W. Choi, 'Gallium Nitride Nanophotonic Structures Patterned by Nanosphere Lithography', 7th International Conference on Materials for Advanced Technologies, Singapore (July 2013).

(7) K.H. Li, H.W. Choi and S.J. Chua, 'InGaN light?emitting diode with an embedded nano?pillar array', Nanoelectronics and Nanophotonics Workshop, Hong Kong (May 2013).

(8) H.W. Choi, 'III?Nitride Nanophotonic Structures Using Nanosphere Lithography', International Conference on Emerging Advanced Nanomaterials, Brisbane, Australia (November 2012).

(9) H.W. Choi, 'Micro-, Nano- and Macro-structuring of InGaN Light-emitting Diodes', International Conference of Young Researchers on Advanced Materials 2012, Singapore, (July 2012).
(10) H.W. Choi, 'Color-tunable LED Technologies', Optical Engineering International Conference 2011, Hong Kong, (November 2011).

(11) H.W. Choi, 'Color-tunable Light-emitting Diode Technologies', International Conference on Advanced Electromaterials, Jeju, South Korea (November 2011).

(12) H.W. Choi, 'Vertical Integration of Light-emitting Diode Chips', 6th IEEE Electron Devices & Solid-State Circuits Conference, Tianjin, China (November 2011).

(13) H.W. Choi, 'The Potentials of Energy-savings Solid-state Lighting', 2011 HKIE Electrical Symposium, Hong Kong (October 2011).

(14) H.W. Choi, 'Color-tunable LED technologies for display and lighting', International Lighting & Display KOREA 2011, Daegu, Korea (September 2011).

(15) X.H. Wang, L. Zhu and H.W. Choi, 'Novel LED Geometries Shaped by Laser Micromachining', Photonics Global Conference 2010, Singapore (December 2010).

(16) W.Y. Fu, K.H. Li and H.W. Choi, 'From Nanosphere Lithography to Self-assembled Photonic Crystals', Progress in Electromagnetics Research Symposium, Cambridge MA, USA (July 2010).

(17) M.D. Dawson, H.W. Choi, C.W. Jeon, E. Gu, J.M. Girkin and C. Griffin, 'Advances in high-density InGaN micro-LED arrays with integrated micro-optical elements', ISBLLED-2004, Gyeongju, Korea, March 2004.

(18) C. Griffin, H.W. Choi, J. Girkin, E. Gu, C.W. Jeon, C. Liu, G. McConnell, I.M. Watson and M.D. Dawson, 'GaN Micro-LED Arrays with Integrated Microlenses', SPIE International Symposium Microelectronics, MEMs and Nanotechnology, Perth, Australia, December 2003.

Conferences Presentations

(1)           H.T. Lu, K.H. Li, and H.W. Choi, 'Monolithic Integration of Light-Emitting Diode and Photodetector for Self-Monitoring of Light Output", International Workshop on Nitride Semiconductors 2016, Orlando, USA (October 2016).

 

(2)           K.H. Li, Y.F. Cheung, K.M. Lau and H.W. Choi," Monolithically-integrated GaN Photonic Systems", International Workshop on Nitride Semiconductors 2016, Orlando, USA (October 2016).

 

(3)           W.Y. Fu and H.W. Choi, 'Indium-content dependent strain-relaxation mechanisms in InGaN/GaN micropillars", International Workshop on Nitride Semiconductors 2016, Orlando, USA (October 2016).

 

(4)           W.S. Cheung and H.W. Choi, 'Emission characteristics of light-emitting diodes by confocal microscopy", SPIE OPTO 2016, San Francisco, USA (Feb 2016).

 

(5)           Y.Y. Zhang, J.A. Huang, T. Wang and H.W. Choi, 'Strain Relaxation Effects In GaN/InGaN Microdisks Pivoted On Si", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(6)           C. Feng, J.A. Huang and H.W. Choi, 'Tuning The Recombination Rate Of InGaN/GaN Nanopillars With Voltage-Induced Space Charge Regions", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(7)           Y.F. Cheung, K.H. Li, J.A. Huang and H.W. Choi, 'Photo-Electro-Vibrational-Thermal Characterization Of Epi-Flexible GaN Light-Emitting Diode", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(8)           J.A. Huang, Y.Y. Zhang, C. Feng and H.W. Choi, 'Optical Investigation Of Ion Damage And Strain Relaxation On Plasma-Etched InGaN/GaN Microdisks By Scanning Near-Field Optical Microscopy And Spectroscopy", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(9)           K.H. Li, Y.F. Cheung, W.S. Cheung and H.W. Choi, 'Confocal microscopic analysis of optical crosstalk from micro-pixel light-emitting diodes", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(10)         W.S. Cheung, K.H. Li, C.W. Tang, C. Zhao, K.M. Lau and H.W. Choi, 'Optical Characteristics Of GaN/Si Micro-Pixel Light-Emitting Diode Arrays", 11th International Conference on Nitride Semiconductors, Beijing, China (Aug 2015).

 

(11)         X.H. Zhang and H.W. Choi, 'GaN Nano-cones Prepared by Jet-printed Nanosphere Arrays", 15th IEEE International Conference on Nanotechnology, Rome, Italy (July 2015).

 

(12)         W.S. Cheung and H.W. Choi, 'Improved Thermal and Optical Performance of Chip-on-board Light-emitting Diode Panel Lamps", SPIE OPTO 2015, San Francisco, USA (February 2015).

 

(13)         Y.F. Cheung, K.H. Li, R.S.Y. Hui and H.W. Choi, 'Thermal Performances of Photonic Crystal Thin-film Light-emitting Diodes", 10th International Symposium on Semiconductor Light Emitting Devices" Kaohsiung, Taiwan (December 2014).

 

(14)         K.H. Li, Y.F. Cheung and H.W. Choi, 'Flexible GaN Light-emitting Diodes", late new presentation, International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(15)         W.S. Cheung, K.H. Li, Y.F. Cheung and H.W. Choi, 'Cross-talk-free optically-isolated micro-light-emitting diode arrays", International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(16)         Y.Y. Zhang, T. Wang and H.W. Choi, 'GaN micro-dome whispering-gallery resonator", International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(17)         Y.Y. Zhang, Z.T. Ma, X.H. Zhang, T. Wang and H.W. Choi, 'Room-temperature blue lasing from InGaN/GaN microdisks pivoted on Si", International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(18)         C. Feng and H.W. Choi, 'Non-phosphor Polychromatic Emission from InGaN/GaN Nano-pillars of Multiple Dimensions", International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(19)         C. Feng, J.A. Huang and H.W. Choi, 'Internal Quantum Efficiency Tuning in Metal-Oxide-Semiconductor InGaN/GaN Nanopillars", International Workshop on Nitride Semiconductors 2014, Wroclaw, Poland (August 2014).

 

(20)         X.H. Zhang and H.W. Choi, 'Single Whispering-gallery Mode Lasing from Free-standing Microdisk with InGaN/GaN Quantum Wells", 26th International Symposium on Compound Semiconductors, Montpellier, France (May 2014).

 

(21)         W.S. Cheung, Y.F. Cheung and H.W. Choi, 'Light-emitting Diode Panel Lamps", Conference on LED and its Industrial Application '14, Yokohama, Japan (Apr 2014).

 

(22)         K.H. Li and H.W. Choi, 'Flip-chip InGaN Light-emitting Diodes with an Integrated Microlens Array", late news presentation, 18th Micro-optics Conference, Tokyo, Japan (Oct 2013).

 

(23)         K.H. Li, K. Zang, S.J. Chua and H.W. Choi, 'Embedding Nano-pillar Arrays in InGaN Light-emitting Diodes", 10th International Conference on Nitride Semiconductors, Washington DC, USA (Aug 2013).

 

(24)         Z.T. Ma, Y.F. Cheung and H.W. Choi, 'Thin film color-tunable micro-pixelated RGB light-emitting diodes", 10th International Conference on Nitride Semiconductors, Washington DC, USA (Aug 2013).

 

(25)         Z. Yue, Y.F. Cheung, H.W. Choi, Z. Zhao, B.Z. Tang and K.S. Wong, 'White light emission from InGaN/organic molecule light-emitting diode", 10th Conference on Lasers and Electro-optics Pacific Rim, art. 6600382 (Jun 2013).

 

(26)         K.H. Li and H.W. Choi, 'Monolithic Integration of Close-packed Micro-lens Array on Flip-chip LEDs", 6th Asia-Pacific Workshop on Widegap Semiconductor, New Taipei City, Taiwan (May 2013).

(27)         W.S.Cheung, Y.F. Cheung, Z.T. Ma, K.H. Li and H.W. Choi, 'Light-emitting Diodes of Stripe Geometries", 6th Asia-Pacific Workshop on Widegap Semiconductor, New Taipei City, Taiwan (May 2013).

 

(28)         K.H. Li and H.W. Choi, Broadband emission from an ensemble of nano-pillars with multiple diameters", SPIE OPTO, San Francisco, IS (February 2013).

 

(29)         K.H. Li, Y.F. Cheung, and H.W. Choi, 'Thin-film Vertical Micro-LEDs", International Workshop on Nitride Semiconductors 2012, Sapporo, Japan (October 2012).

 

(30)         K.H. Li, Q. Zhang and H.W. Choi, '1-μm Micro-lens Array on Flip-chip LEDs", International Workshop on Nitride Semiconductors 2012, Sapporo, Japan (October 2012).

 

(31)         X.H. Zhang, Z.T. Ma and H.W. Choi, 'Evaluation of 200-nm GaN Nanopillar Photonic Crystals", International Workshop on Nitride Semiconductors 2012, Sapporo, Japan (October 2012).

 

(32)         L. Zhu and H.W. Choi, 'InGaN Light-emitting Diodes of Linear Geometry for Floodlighting", International Workshop on Nitride Semiconductors 2012, Sapporo, Japan (October 2012).

 

(33)         Q. Zhang, K.H. Li and H.W. Choi, 'Polarized Emission from InGaN Light-emitting Diode with Self-assembled Opal Coating", 12th International Conference on Nanotechnology, Birmingham, UK (August 2012).

 

(34)         Y.F. Cheung, K.H. Li and H.W. Choi, 'Thin-film Photonic Crystal Vertical LED patterned by Nanosphere Lithography", International Symposium on Semiconductor Light Emitting Devices, Berlin, Germany (July 2012).

 

(35)         K.H. Li, Z.T. Ma and H.W. Choi, 'Clover-shaped GaN Photonic Bandgap Structures Patterned by Repeated Nanosphere Lithography", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(36)         Z.T. Ma and H.W. Choi, 'Color-tunable Emitter Implemented with a Group-addressable micro-LED and Jet-printed Pixels", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(37)         K.H. Li, G.Y. Mak and H.W. Choi, 'Hexagonally-arranged Ag nanoparticles embedded within GaN nanopillar arrays", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(38)         K.H. Li and H.W. Choi, 'Light-emitting diode with photonic crystal on ITO film", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(39)         Q. Zhang, X.H. Zhang, K.H. Li and H.W. Choi, 'Polarization of GaN light-emitting diode with 3D opal-based photonic crystals", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(40)         Y.F. Cheung and H.W. Choi, 'Color-tunable LEDs implemented by a tightly-integrated chip stacking approach", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(41)         K.H. Li, K.Y. Zhang, S.J. Chua and H.W. Choi, 'Interconnected nano-pillar photonic crystal LEDs via epitaxial lateral overgrowth", 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).

 

(42)         X.H. Wang, J.Q. Ning, S.J. Xu and H.W. Choi, 'Optical Investigations of FIB patterned InGaN/GaN MQW Nanopillar Array", 38th International Symposium on Compound Semiconductors, Berlin, Germany (May 2011).

 

(43)         K.H. Li and H.W. Choi, 'Single whispering gallery mode lasing from metal-clad GaN nanopillar array", 38th International Symposium on Compound Semiconductors, Berlin, Germany (May 2011).

 

(44)         R. Chen, H.D. Sun, T. Wang, K.N. Hui and H.W. Choi, 'Ultraviolet Lasing from AlGaN Nanopillars Patterned by Nanosphere Lithography", 2010 Microoptics Conference, Hsinchu, Taiwan (October 2010).

 

(45)         K.H. Li and H.W. Choi, 'Hexagonal-close-packed Nano-ring Array Fabricated by Nanosphere Lithography", 2010 Microoptics Conference, Hsinchu, Taiwan (October 2010).

 

(46)         Y. Gong, T. Wang, H.D. Sun and H.W. Choi, '343.7 nm Lasing from III-nitride Based Vertical Cavity Surface Emitting Laser via Optical Pumping", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(47)         F.S. Yeung, Z.T. Ma and H.W. Choi, 'Color-tunable LEDs based on a group-addressable micro-LED array", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(48)         L. Zhu, S.Y. Huang, P.T. Lai and H.W. Choi, 'Hemispherical InGaN/GaN Light-emitting Diode for efficient fiber coupling", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(49)         G.Y. Mak, Y.F. Cheung, E.Y. Lam and H.W. Choi, 'Liquid-immersion Laser Micromachining of GaN Trenches and its Application in Device Fabrication", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(50)         X.H. Wang, S.J. Xu and H.W. Choi, 'FIB Fabrication of GaN Nano-conical Tips", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(51)         L. Zhu, P.T. Lai and H.W. Choi, 'Vertically-stacked polychromatic light-emitting diodes via liquid capillarity", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(52)         K.H. Li and H.W. Choi, 'Tuning of Photonic Bandgap via Dimensional Control of Nanopillars", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(53)         G.Y. Mak, L. Zhu, E.Y. Lam and H.W. Choi, 'Plasmonically-enhanced quantum-dot white-light InGaN light-emitting diode", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(54)         Z.L. Li, K.H. Li and H.W. Choi, 'Reliability Study on Micro-structured InGaN Light-emitting Diodes", International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).

 

(55)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Capacitively-coupled Althernating-current Light-emitting Device for 12V Applications", 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp43-4 (July 2010).

 

(56)         K.H. Li and H.W. Choi, 'Site-controlled GaN Photonic Crystals by Nanosphere Lithography", 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp45-6 (July 2010).

 

(57)         L. Zhu, P.T. Lai and H.W. Choi, 'Hemispherical InGaN/GaN Light-emitting Diodes for Efficient Fiber Coupling",  12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp523-4 (July 2010).

 

(58)         X.H. Wang, K.Y. Lam, P.T. Lai and H.W. Choi, 'Novel Polygon LEDs for Higher Light Extraction", 8th International Symposium on Semiconductor Light Emitting Devices, Beijing, China (May 2010).

 

(59)         L. Zhu, P.T. Lai and H.W. Choi, 'Vertically-mounted LEDs for Superior Light Extraction", 8th International Symposium on Semiconductor Light Emitting Devices, Beijing, China (May 2010).

 

(60)         L. Zhu, X.H. Wang, P.T. Lai and H.W. Choi, 'Angular uniform white light-emitting diodes with an internal reflector cup", 2nd International Conference on White LEDs and Solid State Lighting, Taipei, Taiwan (December 2009).

 

(61)         K.N. Hui, P.T. Lai and H.W. Choi, 'RGB Stacked White LEDs", 2nd International Conference on White LEDs and Solid State Lighting, Taipei, Taiwan (December 2009).

 

(62)         G. Chen, H.W. Choi and P.T. Lai, 'A Study on InGaN/GaN Multiple Quantum-well Hydrogen Sensor with HfTiO as Gate Dielectric", 2009 International Conference on Electron Devices and Solid-state Circuits, pp127-130, Xian, China (December 2009).

 

(63)         L.F. Deng, H.W. Choi, P.T. Lai, Y.R. Liu and J.P. Xu, 'Low-voltage polymer thin-film transistors with high-k HfTiO gate dielectric annealed in NH3 or N2",  2009 International Conference on Electron Devices and Solid-state Circuits, pp201-204, Xian, China (December 2009).

 

(64)         X.H. Wang, P.T. Lai and H.W. Choi, 'Design and Performance of LEDs with Circular Geometry", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(65)         W.Y. Fu, K.K.Y. Wong and H.W. Choi, 'Hemi-ellipsoid Photonic Crystal Structure for Light Extraction", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(66)         W.Y. Fu, K.K.Y. Wong and H.W. Choi, 'Room-temperature lasing from an array of GaN nano-tips", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(67)         Z.L. Li, P.T. Lai and H.W. Choi, 'Failure Analysis of InGaN/GaN LEDs with Emission Wavelength between 440 nm and 550 nm", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(68)         G.Y. Mak, E.Y. Lam and H.W. Choi, 'Deep Etch of GaN by Laser Micromachining", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(69)         L. Zhu, P.T. Lai and H.W. Choi, 'An ultraviolet micro-LED array and its application for microlens fabrication", 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).

 

(70)         L. Zhu, C.W. Ng, N. Wong, K.Y. Wong, P.T. Lai and H.W. Choi, 'Fiber-coupled Emissive Micro-LED Arrays",  Society for Information Display- Display Week, San Antonio, USA (June 2009).

 

(71)         X.H. Wang, K.N. Hui, W.Y. Fu, K.Y. Wong, P.T. Lai and H.W. Choi, 'Truncated-pyramidal Light-emitting Diodes Processed by Laser Micromachining", 5th International Congress on Laser Advanced Materials Processing, Kobe, Japan (June 2009).

 

(72)         X.H. Wang, P.T. Lai and H.W. Choi, 'Laser Micro-machining of Three-dimensional Microstructures in Optical Materials", Materials Research Society Symposium Proceedings 1179, 99 (April 2009).

 

(73)         Z.L. Li, P.T. Lai and H.W. Choi, 'Reliability Study on Green InGaN/GaN Light-emitting Diodes", Microscopy of Semiconducting Materials XVI, Oxford, United Kingdom (March 2009).

 

(74)         W.Y. Fu, K.K.Y. Wong and H.W. Choi, 'A Novel GaN Photonic Crystal Structure Comprising Angled Nanopillars", International Nitride Workshop 2008, Montreux, Switzerland (October 2008).

 

(75)         G.Y. Mak, W.Y. Fu, E.Y. Lam and H.W. Choi, 'Metallic Nanoparticle Array on GaN by Microsphere Lithography", International Nitride Workshop 2008, Montreux, Switzerland (October 2008).

 

(76)         W.N. Ng, S. Tripathy, C.H. Leung, P.T. Lai and H.W. Choi, 'Fabrication of Strain-relaxed GaN Nanopillars by Nanosphere Lithography", International Nitride Workshop 2008, Montreux, Switzerland (October 2008).

(77)         K.N. Hui, P.T. Lai and H.W. Choi, 'Vertically-stacked Color-tunable LEDs", International Nitride Workshop 2008, Montreux, Switzerland (October 2008).

 

(78)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Light-emitting Diodes with Photonic Crystal Grating Fabricated by Microsphere Lithography", 32th Workshop on Compound Semiconductor Devices and Integrated Circuits, Leuven, Belgium (May 2008), p167.

 

(79)         K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'High Performance White LEDs using Fluorescent Microspheres", 1st International Conference on White LEDs and Solid State Lighting, Tokyo, Japan (November 2007), p188.

 

(80)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'White LEDs with Variable Colour Temperature", 1st International Conference on White LEDs and Solid State Lighting, Tokyo, Japan (November 2007), p496.

 

(81)         K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Polychromatic Emission from Fluorescent-Microsphere-Coated LEDs", 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).

 

(82)         W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Light Emitting Diodes with Wavelength-Tunable Output", 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).

 

(83)         W.N. Ng, X.H. Wang, C.H. Leung, P.T. Lai and H.W. Choi, 'Nanopatterning GaN with Microspheres", 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).

 

(84)         W.N. Ng, K.N. Hui, C.H. Leung, P.T. Lai and H.W. Choi, 'Fabrication of Microstructures in GaN Light Emitting Diodes by Microsphere Lithography", International Conference on Materials for Advanced Technologies 2007, Singapore (July 2007).

 

(85)         K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, 'Novel Energy-efficient Solid-state White Light Sources", International Conference on Electrical Engineering 2007, Hong Kong (July 2007).

 

(86)         W.N. Ng, K.N. Hui, C.H. Leung, P.T. Lai and H.W. Choi, 'Microstructures on GaN by microsphere lithography", Microscopy of Semiconducting Materials XV, Cambridge, United Kingdom (April 2007).

 

(87)         H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, J.H. Teng, S. Tripathy and S.J. Chua, 'Stimulated Emission from Free-standing GaN/Si Microdisk Structures", International Workshop on Nitride Semiconductors 2006, Kyoto, Japan (October 2006).

 

(88)         H.W. Choi, B.L. Yang, P.T. Lai, P. Chen and S.J. Chua, 'Free-standing GaN-MQW Microdisks Pivoted on Si Substrate", International Symposium on Blue Laser and Light Emitting Diodes, Montpellier, France (May 2006).

 

(89)         C.-L. Lee, H.W. Choi, E. Gu and M.D. Dawson, 'Fabrication and Characterization of Diamond Micro-optics", Diamond 2005, Toulouse, France (September 2005).

 

(90)         H.W. Choi, 'White Light LEDs", International Conference on Nitride Semiductors, Bremen, Germany (September 2005).

 

(91)         H.W. Choi and S.J. Chua, 'Hexagonally-closed-packed Micro-light-emitting Diodes", International Conference on Nitride Semiductors, Bremen, Germany (September 2005).

 

(92)         C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, O.J. Rolinski, D.J. S. Birch, J.M. Girkin and M.D. Dawson, 'Fluorescence Excitation and Lifetime Measurements using GaN/InGaN microLED Arrays", LEOS 04, Puerto Rico (November 2004).

 

(93)         E. Gu, H.W. Choi, C. Liu, I.M. Watson, J.M. Girkin and M.D. Dawson, 'Bifocal and negative microlenses on hard optical materials", LEOS 04, Puerto Rico (November 2004).

 

(94)         E. Gu, H.W. Choi, C. Liu, I.M. Watson, J.M. Girkin and M.D. Dawson, 'Bifocal and negative microlenses on hard optical materials", 10th Micro-optics Conference, Jena, Germany (September 2004).

 

(95)         H.W. Choi, E. Gu, J.M. Girkin and M.D. Dawson, 'Nitride micro-display with integrated micro-lenses',International Nitride Workshop, Pittsburgh, USA (July 2004).

 

(96)         H.W. Choi and M.D. Dawson, 'Enhanced areal efficiency from 370 nm AlGaN micro-ring light emitting diodes, International Nitride Workshop, Pittsburgh, USA (July 2004).

 

(97)         C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, G. McConnell, J.M. Girkin and M.D. Dawson, 'Integration of InGaN/GaN Micro-array Light-emitting Diodes with Micro-lenses", Optics and Photonics 2004, Photon04, Glasgow, UK (September 2004).

 

(98)         P.R. Edwards, R.W. Martin, H.W. Choi and M.D. Dawson, 'Hyper-spectral cathodoluminescence imaging of blue light-emitting micro-devices", ISBLLED-2004, Gyeongju, Korea, March 2004.

 

(99)         H.W. Choi, C.W. Jeon, C.Liu and M.D. Dawson, 'GaN micro-LED arrays with integrated sapphire micro-lenses", 16th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Tucson, USA, pp654-5.

 

(100)       C.W. Jeon, H.W. Choi and M.D. Dawson, 'Fabrication and performance of high-density, matrix addressable green and ultra-violet micro-LED arrays',16th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Tucson, USA, pp878-9.

 

(101)       E. Gu, H.W. Choi, C.W. Jeon, G. Rice, C. Liu, I.M. Watson, M.D. Dawson, P.R. Edwards and R.W. Martin, 'Microstructure fabrication in Gallium Nitride, Silicon Carbide and Diamond", Wide Bandgap Semiconductor Technology (September 2003).

 

(102)       H.W. Choi, P.R. Edwards, C.W. Jeon, R.W. Martin, M.D. Dawson, S. Tripathy and S.J. Chua, 'Sub-micron InGaN Ring Structures for High-efficiency LEDs", European MRS Fall 2003, Warsaw, Poland (September 2003).

 

(103)       H.W. Choi, C.W. Jeon and M.D. Dawson, 'InGaN Light Emitting Diodes of Micro-ring Geometry", ICNS-5, Nara, Japan (May 2003).

 

(104)       H.W. Choi, C.W. Jeon and M.D. Dawson, 'Low Resistivity p-type Contacts to GaN by Plasma Treatments", ICNS-5, Nara, Japan (May 2003).

 

(105)       C.W. Jeon, H.W. Choi and M.D. Dawson, 'A Novel Fabrication Method for a 64x64 Matrix-addressable GaN-based micro-LED Array", ICNS-5, Nara, Japan (May 2003).

 

(106)       E. Gu, C.W. Jeon, H.W. Choi, G. Rice, M.D. Dawson, E.K. Illy and M.R.H. Knowles, 'Micromachining and dicing of sapphire, gallium nitride and micro-LED devices with UV copper vapour laser", E-MRS 2003 Spring Meeting, Strasbourg, France, June 2003.

 

(107)       G. McConnell, E. Gu, C. Griffin, C.W. Jeon, H.W. Choi, J.M. Girkin and M.D. Dawson, 'Structural and Performance Evaluation of Gallium Nitride micro-LED Arrays via Multiphoton Fluorescence Imaging", 15th International Conference on Confocal Microscopy, Italy, 2003.

 

(108)       H.W. Choi, C.W. Jeon and M.D. Martin, 'Fabrication of Matrix-addressable Micro-LED Arrays Based on a Novel Etch Technique" ICMAT 2003, Singapore (December2003).

 

(109)       G. McConnell, E. Gu, C. Griffin, C.W. Jeon, H.W. Choi, A.M. Gurney, J.M. Girkin and M.D. Dawson, 'Two-photon Fluorescence Imaging of Gallium Nitride Micro-LED Arrays", Proceedings of the 13rd International Conference on Microscopy of Semiconducting Materials, Institute of Physics Conference Series 180, pp341, Cambridge, UK, 2003.

(110)       H.W. Choi, C.W. Jeon, M.D. Dawson, P.R. Edwards and R.W. Martin, 'Efficient GaN-based micro-LED Arrays", in GaN and related alloys-2002, edited by C. Wetzel, E.T. Yu, J.S. Speck, A. Rizzi and Y. Arakawa, (MRS Symposium Proceedings, Pittsburgh, 2002), Vol 743.

 

(111)       M.A. Rana, H.W. Choi, M.B.H. Breese, T. Osipowicz, F. Watt and S.J. Chua, 'A Study of Decomposition of GaN During Annealing", in GaN and related alloys-2002, edited by C. Wetzel, E.T. Yu, J.S. Speck, A. Rizzi and Y. Arakawa, (MRS Symposium Proceedings, Pittsburgh, 2002), Vol 743.

 

(112)       C.W. Jeon, H.W. Choi and M.D. Dawson, '64x64 Matrix-Addressable Arrays of GaN-based MicroLEDs", 15th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Glasgow, UK, pp685-6.

 

(113)       H.W. Choi and S.J. Chua, 'The Relationship Between Gallium Vacancies and Plasma Damage to n-GaN", Fourth International Conference on Nitride Semiconductors (ICNS-4), July 2001, Denver, USA.

 

(114)       H.W. Choi, X.J. Kang and S.J. Chua, 'Surface Modification and Ohmic Contact Formation to n- and p-type GaN", Fourth International Conference on Nitride Semiconductors (ICNS-4), July 2001, Denver, USA.

 

(115)       H.W. Choi, J. Zhang and S.J. Chua, 'Dislocation Scattering in n-type GaN", International Conference on Materials for Advanced Technologies, July 2001, Singapore.

 

(116)       H.W. Choi, S.J. Chua, X.H.Xu, Y.J. Sun, 'Electrical Properties of Plasma Damaged n-GaN", International Workshop on Nitride Semiconductors (IWN2000), Nagoya, Japan, 2000, pp786-789.

 

(117)       H.W. Choi, S.J. Chua, J.W. Chai, A. Raman, 'Contrast Between ICP and RIE Plasma Exposed n-GaN", 25th International Conference on Physics of Semiconductors (ICPS25), Osaka, Japan, September 2000, pp1561-1562.

 

(118)       J.H. Teng, S.J. Chua, W. Liu, X.C. Wang, H.W. Choi, J.R. Dong, G. Li and D. Braddoc, 'Improved carrier transport in intermixed GaAs/AlGaAs laser structure with multi-quantum wells cladding" in Morphological and Compositional Evolution of Heteroepitaxial Semiconductor Thin Films, MRS Symposium Proceedings, Pittsburgh, 2000), Vol 618.

 

(119)       H.W. Choi and S.J. Chua, A. Ramam 'Flicker Noise Characteristics of Plasma-Induced Damaged GaN Planar Resistors", MRS Spring 2000.

 

(120)       H.W. Choi and S.J. Chua, 'Improvement of 1/f Noise Properties of n-GaN by ICP Plasma Exposure", International Workshop on Advances in Materials Science and Technology, Singapore (April 2000).

 

(121)       H.W. Choi and S.J. Chua, 'Flicker Noise Characterization of Plasma-Induced Damaged Gallium Nitride", 5th International Semiconductor Device Research Symposium (ISDRS99), Charlottesville, USA (December 1999).

 

(122)       H.W. Choi and S.J. Chua, 'Lattice Dynamics Calculation of Zone-Centre Phonon Frequencies for Gallium Nitride", 4th National Symposium on Progress in Material Research, Singapore (April 1998).

 

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