Academic Staff

Gallium Nitride materials/ device design, modeling, processing and characterization

Anthony Choi joined the department in 2004 after postdoctoral training with Prof. M.D. Dawson at the Institute of Photonics, University of Strathclyde in Glasgow, UK. He studied electronic engineering at the National University of Singapore between 1994 and 2001. His PhD work was performed at the Centre for Optoelectronics under Prof S.J. Chua on plasma processing of GaN materials, obtaining his doctorate in 2003. In Glasgow, Dr Choi carried out pioneering development work on GaN-based emissive micro-light-emitting diode arrays, demonstrating applications in the areas of micro-displays and high-efficiency light sources.

At the Semiconductor Lighting and Display Laboratory, Dr Choi leads a team of researchers investigating frontier research topics including solid-state lighting, GaN micro-cavities, fiber-coupled micro-displays and 3D laser micromachining. His major contributions include using fluorescent microspheres for white light LEDs, design and implementation of a stacked polychromatic LED structure, emissive nitride microdisplays and pivoted GaN-on-Si microcavities amongst others. He has published over 100 papers in leading journals and international conferences, contributed to 2 book chapters, filed numerous US and PCT patents and is actively involved in professional activities, such as serving as chairperson for the international conference LEDsAsia 2009.

• 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 (2009).
  
  
• 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 (2009).
  
  
• 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 (2009).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• H.W. Choi, C.W. Jeon and M.D. Dawson,
  "High-resolution 128x96 Nitride Microdisplay", IEEE Electron Device Letters 25, 277 (2004).
  
  
• 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).
  
  
• H.W. Choi, C.W. Jeon and M.D. Dawson,
  "InGaN Microring Light Emitting Diodes", IEEE Photonics Technology Letters 16, 33 (2004).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).
  
  
• 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).