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Article: Evaluation of InGaN/GaN light-emitting diodes of circular geometry

TitleEvaluation of InGaN/GaN light-emitting diodes of circular geometry
Authors
KeywordsAxial symmetry
Circular disk
Circular geometry
Emission beams
Emission pattern
Issue Date2009
PublisherOptical Society of America. The Journal's web site is located at http://www.opticsexpress.org
Citation
Optics Express, 2009, v. 17 n. 25, p. 22311-22319 How to Cite?
AbstractBlue GaN light emitting diodes (LEDs) in the shape of cuboids and circular disks have been fabricated by laser micromachining. The proposed circular geometry serves to enhance overall light extraction on a macro-scale and to improve uniformity of the emission pattern due to the rotational symmetry of the chip. Analysis of the chip shaping effect is carried out by ray-tracing simulations and further supported with mathematical modeling using ideal LED models, and subsequently verified with fabricated devices. In comparison, a 10% improvement in overall emission was observed for circular LEDs over the regular cuboids, consistent with simulations and calculations. The measured emission pattern from the circular LED confirms the axial symmetry of the emission beam. © 2009 Optical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/124735
ISSN
2015 Impact Factor: 3.148
2015 SCImago Journal Rankings: 2.186
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, XHen_HK
dc.contributor.authorFu, WYen_HK
dc.contributor.authorLai, PTen_HK
dc.contributor.authorChoi, HWen_HK
dc.date.accessioned2010-10-31T10:51:09Z-
dc.date.available2010-10-31T10:51:09Z-
dc.date.issued2009en_HK
dc.identifier.citationOptics Express, 2009, v. 17 n. 25, p. 22311-22319en_HK
dc.identifier.issn1094-4087en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124735-
dc.description.abstractBlue GaN light emitting diodes (LEDs) in the shape of cuboids and circular disks have been fabricated by laser micromachining. The proposed circular geometry serves to enhance overall light extraction on a macro-scale and to improve uniformity of the emission pattern due to the rotational symmetry of the chip. Analysis of the chip shaping effect is carried out by ray-tracing simulations and further supported with mathematical modeling using ideal LED models, and subsequently verified with fabricated devices. In comparison, a 10% improvement in overall emission was observed for circular LEDs over the regular cuboids, consistent with simulations and calculations. The measured emission pattern from the circular LED confirms the axial symmetry of the emission beam. © 2009 Optical Society of America.en_HK
dc.languageengen_HK
dc.publisherOptical Society of America. The Journal's web site is located at http://www.opticsexpress.orgen_HK
dc.relation.ispartofOptics Expressen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsOptics Express. Copyright © Optical Society of America.-
dc.rightsThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?uri=oe-17-25-22311. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.-
dc.subjectAxial symmetry-
dc.subjectCircular disk-
dc.subjectCircular geometry-
dc.subjectEmission beams-
dc.subjectEmission pattern-
dc.titleEvaluation of InGaN/GaN light-emitting diodes of circular geometryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1094-4087&volume=17&issue=25&spage=22311&epage=22319&date=2009&atitle=Evaluation+of+InGaN/GaN+light-emitting+diodes+of+circular+geometry-
dc.identifier.emailLai, PT:laip@eee.hku.hken_HK
dc.identifier.emailChoi, HW:hwchoi@eee.hku.hken_HK
dc.identifier.authorityLai, PT=rp00130en_HK
dc.identifier.authorityChoi, HW=rp00108en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1364/OE.17.022311en_HK
dc.identifier.pmid20052154-
dc.identifier.scopuseid_2-s2.0-72049108424en_HK
dc.identifier.hkuros175234en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72049108424&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue25en_HK
dc.identifier.spage22311en_HK
dc.identifier.epage22319en_HK
dc.identifier.isiWOS:000272761300005-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWang, XH=34168501000en_HK
dc.identifier.scopusauthoridFu, WY=24481323900en_HK
dc.identifier.scopusauthoridLai, PT=7202946460en_HK
dc.identifier.scopusauthoridChoi, HW=7404334877en_HK

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