{"id":226,"date":"2022-01-05T13:27:44","date_gmt":"2022-01-05T05:27:44","guid":{"rendered":"https:\/\/www.eee.hku.hk\/microLED\/?p=226"},"modified":"2022-01-05T13:27:45","modified_gmt":"2022-01-05T05:27:45","slug":"vertically-mounted-ingan-on-sapphire-light-emitting-diodes","status":"publish","type":"post","link":"https:\/\/www.eee.hku.hk\/microLED\/vertically-mounted-ingan-on-sapphire-light-emitting-diodes\/","title":{"rendered":"Vertically Mounted InGaN-on-Sapphire Light-Emitting Diodes"},"content":{"rendered":"\n<p class=\"has-text-align-right wp-block-paragraph\">&#8211; <em>L\u00a0Zhu, ZT Ma, PT Lai, and HW Choii<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"600\" src=\"https:\/\/www.eee.hku.hk\/microLED\/wp-content\/uploads\/2022\/01\/5659470-fig-1-source-large.gif\" alt=\"\" class=\"wp-image-227\"\/><figcaption>(a) Schematic diagram of a vmLED. (b) Assembled vmLED on TO-package before encapsulation. (c) and (d) Two different views of an encapsulated vmLED biased at 10 mA.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>IEEE Transactions on Electron Devices, vol. 58, 2, pp. 490-494 (2011)<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An InGaN\/GaN light-emitting diode (LED) chip mounted in a vertical configuration (vmLED) is demonstrated, exhibiting significant enhancement to light extraction, compared with a LED mounted in a conventional planar geometry. By flipping the chip orthogonally, two large illumination surfaces of the device are exposed for direct light extraction. Comparisons, through ray-trace modeling and experiment data with conventional surface-mounted LEDs, indicate that the vmLEDs achieve superior light extraction efficiency. A sapphire-prism-mounted vmLED is further proposed to improve heat sinking, which is well suited for higher current operations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DOI:<a href=\"https:\/\/doi.org\/10.1109\/LED.2004.826541\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/LED.2004.826541\"> <\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1088\/0957-4484\/19\/25\/255302\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1088\/0957-4484\/19\/25\/255302\" target=\"_blank\"><\/a><a href=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1088\/0957-4484\/19\/35\/355203\" data-type=\"URL\" data-id=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1088\/0957-4484\/19\/35\/355203\"><\/a><a href=\"https:\/\/doi.org\/10.1109\/JPHOT.2009.2020963\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/JPHOT.2009.2020963\"><\/a><a href=\"https:\/\/doi.org\/10.1109\/TED.2010.2091960\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/TED.2010.2091960\" target=\"_blank\" rel=\"noreferrer noopener\">10.1109\/TED.2010.2091960<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8211; L\u00a0Zhu, ZT Ma, PT Lai, and HW Choii IEEE Transactions on Electron Devices, vol. 58, 2, pp. 490-494 (2011) An InGaN\/GaN light-emitting diode (LED)&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,4],"class_list":["post-226","post","type-post","status-publish","format-standard","hentry","category-publications","tag-light-extraction","tag-microled"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/comments?post=226"}],"version-history":[{"count":1,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/226\/revisions"}],"predecessor-version":[{"id":228,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/226\/revisions\/228"}],"wp:attachment":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/media?parent=226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/categories?post=226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/tags?post=226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}