{"id":173,"date":"2022-01-04T18:13:25","date_gmt":"2022-01-04T10:13:25","guid":{"rendered":"https:\/\/www.eee.hku.hk\/microLED\/?p=173"},"modified":"2022-01-04T18:13:27","modified_gmt":"2022-01-04T10:13:27","slug":"geometrical-shaping-of-ingan-light-emitting-diodes-by-laser-micromachining","status":"publish","type":"post","link":"https:\/\/www.eee.hku.hk\/microLED\/geometrical-shaping-of-ingan-light-emitting-diodes-by-laser-micromachining\/","title":{"rendered":"Geometrical Shaping of InGaN Light-Emitting Diodes by Laser Micromachining"},"content":{"rendered":"\n<p class=\"has-text-align-right\">&#8211; <em>WY Fu, KN Hui, XH Wang, KKY Wong, PT Lai, and HW Choi<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"459\" height=\"550\" src=\"https:\/\/www.eee.hku.hk\/microLED\/wp-content\/uploads\/2022\/01\/4957011-fig-4-source-small.gif\" alt=\"\" class=\"wp-image-174\"\/><figcaption>Optical microphotographs showing (a) cuboid LED and (b) truncated pyramidal-LED biased at 10 mA after laser micromachining.<\/figcaption><\/figure>\n\n\n\n<p><strong><em>IEEE Photonics Technology Letters, vol. 21, 15, pp. 1078-1080 (2009)<\/em><\/strong><\/p>\n\n\n\n<p>Geometrical shaping of InGaN light-emitting diodes (LEDs) by laser micromachining is introduced. The sapphire substrate is shaped with inclined sidewalls at 50deg, serving as a prism favoring light redirection for out-coupling from the top window. Compared to conventional cuboid LEDs with a calculated light extraction efficiency eta\u00a0<sub>ext<\/sub>\u00a0of 18.3%, these shaped LEDs offers a pronounced increase in eta\u00a0<sub>ext<\/sub>\u00a0of up to 85.2%, verified by experimental results.<\/p>\n\n\n\n<p>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 rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1364\/OE.17.009873\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1364\/OE.17.009873\" target=\"_blank\"><\/a><a href=\"https:\/\/doi.org\/10.1109\/LPT.2009.2022751\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/LPT.2009.2022751\"><a rel=\"noreferrer noopener\" target=\"_blank\" href=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1109\/LPT.2009.2022751\">10.1109\/LPT.2009.2022751<\/a><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8211; WY Fu, KN Hui, XH Wang, KKY Wong, PT Lai, and HW Choi IEEE Photonics Technology Letters, vol. 21, 15, pp. 1078-1080 (2009) Geometrical&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":[6,4,8],"class_list":["post-173","post","type-post","status-publish","format-standard","hentry","category-publications","tag-light-extraction","tag-microled","tag-monolithic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/173","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=173"}],"version-history":[{"count":1,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/173\/revisions"}],"predecessor-version":[{"id":175,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/173\/revisions\/175"}],"wp:attachment":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/media?parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/categories?post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/tags?post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}