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Article: Angularly uniform white light-emitting diodes using an integrated reflector cup

TitleAngularly uniform white light-emitting diodes using an integrated reflector cup
Authors
KeywordsColor uniformity
Laser micromachining
Light extraction
White light-emitting diode (LED)
Issue Date2010
PublisherIEEE.
Citation
Ieee Photonics Technology Letters, 2010, v. 22 n. 7, p. 513-515 How to Cite?
AbstractWe report on white light-emitting diodes (LEDs) with a truncated-conical (TC) geometry produced by laser micromachining. A blue LED was shaped into a circular disc with 50°-inclined sidewall using a modified laser micromachining setup. A layer of Al was coated onto the inclined sidewall and the bottom surface to form an integrated reflector. Due to the highly reflective mirror, laterally propagating photons are redirected into the upward direction, contributing to an increase of 21.7% of light intensity in the normal direction. With quantum dots applied to the surface, white light emission from this TC-LED structure demonstrated a 37% enhancement in color uniformity, compared with a conventional device. © 2010 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/124663
ISSN
2015 Impact Factor: 1.945
2015 SCImago Journal Rankings: 1.433
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 7118/09E
Funding Information:

This work was supported by a CERG grant of the Research Grant Council of Hong Kong ( project HKU 7118/09E).

References

 

DC FieldValueLanguage
dc.contributor.authorZhu, Len_HK
dc.contributor.authorWang, XHen_HK
dc.contributor.authorLai, PTen_HK
dc.contributor.authorChoi, HWen_HK
dc.date.accessioned2010-10-31T10:47:13Z-
dc.date.available2010-10-31T10:47:13Z-
dc.date.issued2010en_HK
dc.identifier.citationIeee Photonics Technology Letters, 2010, v. 22 n. 7, p. 513-515en_HK
dc.identifier.issn1041-1135en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124663-
dc.description.abstractWe report on white light-emitting diodes (LEDs) with a truncated-conical (TC) geometry produced by laser micromachining. A blue LED was shaped into a circular disc with 50°-inclined sidewall using a modified laser micromachining setup. A layer of Al was coated onto the inclined sidewall and the bottom surface to form an integrated reflector. Due to the highly reflective mirror, laterally propagating photons are redirected into the upward direction, contributing to an increase of 21.7% of light intensity in the normal direction. With quantum dots applied to the surface, white light emission from this TC-LED structure demonstrated a 37% enhancement in color uniformity, compared with a conventional device. © 2010 IEEE.en_HK
dc.languageengen_HK
dc.publisherIEEE.-
dc.relation.ispartofIEEE Photonics Technology Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsIEEE Photonics Technology Letters. Copyright © IEEE.-
dc.rights©2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.-
dc.subjectColor uniformityen_HK
dc.subjectLaser micromachiningen_HK
dc.subjectLight extractionen_HK
dc.subjectWhite light-emitting diode (LED)en_HK
dc.titleAngularly uniform white light-emitting diodes using an integrated reflector cupen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1041-1135&volume=22&issue=7&spage=513&epage=515&date=2010&atitle=Angularly+uniform+white+light-emitting+diodes+using+an+integrated+reflector+cup-
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.doi10.1109/LPT.2010.2041651en_HK
dc.identifier.scopuseid_2-s2.0-77955201631en_HK
dc.identifier.hkuros175232en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955201631&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume22en_HK
dc.identifier.issue7en_HK
dc.identifier.spage513en_HK
dc.identifier.epage515en_HK
dc.identifier.isiWOS:000275370700014-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhu, L=36351290800en_HK
dc.identifier.scopusauthoridWang, XH=34168501000en_HK
dc.identifier.scopusauthoridLai, PT=7202946460en_HK
dc.identifier.scopusauthoridChoi, HW=7404334877en_HK

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