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Article: Color-tunable and Phosphor-free White-light Multilayered Light-emitting Diodes

TitleColor-tunable and Phosphor-free White-light Multilayered Light-emitting Diodes
Authors
KeywordsColor tuning
Light-emitting diode (LED)
Issue Date2013
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=16
Citation
IEEE Transactions on Electron Devices, 2013, v. 60 n. 1, p. 333-338 How to Cite?
AbstractA tightly integrated 3-D RGB light-emitting diode (LED) stack is demonstrated. Chips of identical dimensions are stacked on top of each other, with wire bonds embedded within. This is achieved by integrating laser-micromachined channels onto the sapphire face of InGaN LEDs, serving to accommodate wire bonds from the chip beneath. The resultant structure eliminates leakage of monochromatic light from individual chips, producing optimally mixed emission through the top aperture. The device can emit a wide range of colors and is an efficient phosphor-free white-light LED as well. When emitting at correlated color temperatures (CCTs) of 2362 K, 5999 K, and 7332 K, the device generates ~ 20 lm/W, exhibiting performance invariant of CCT. Thermal characteristics of this multilayered device are investigated via infrared thermometry.
Persistent Identifierhttp://hdl.handle.net/10722/189019
ISSN
2019 Impact Factor: 2.913
2015 SCImago Journal Rankings: 1.436
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCheung, YF-
dc.contributor.authorChoi, HW-
dc.date.accessioned2013-09-17T14:24:34Z-
dc.date.available2013-09-17T14:24:34Z-
dc.date.issued2013-
dc.identifier.citationIEEE Transactions on Electron Devices, 2013, v. 60 n. 1, p. 333-338-
dc.identifier.issn0018-9383-
dc.identifier.urihttp://hdl.handle.net/10722/189019-
dc.description.abstractA tightly integrated 3-D RGB light-emitting diode (LED) stack is demonstrated. Chips of identical dimensions are stacked on top of each other, with wire bonds embedded within. This is achieved by integrating laser-micromachined channels onto the sapphire face of InGaN LEDs, serving to accommodate wire bonds from the chip beneath. The resultant structure eliminates leakage of monochromatic light from individual chips, producing optimally mixed emission through the top aperture. The device can emit a wide range of colors and is an efficient phosphor-free white-light LED as well. When emitting at correlated color temperatures (CCTs) of 2362 K, 5999 K, and 7332 K, the device generates ~ 20 lm/W, exhibiting performance invariant of CCT. Thermal characteristics of this multilayered device are investigated via infrared thermometry.-
dc.languageeng-
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=16-
dc.relation.ispartofIEEE Transactions on Electron Devices-
dc.rightsIEEE Transactions on Electron Devices. Copyright © IEEE.-
dc.subjectColor tuning-
dc.subjectLight-emitting diode (LED)-
dc.titleColor-tunable and Phosphor-free White-light Multilayered Light-emitting Diodes-
dc.typeArticle-
dc.identifier.emailChoi, HW: hwchoi@eee.hku.hk-
dc.identifier.authorityChoi, HW=rp00108-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/TED.2012.2228866-
dc.identifier.scopuseid_2-s2.0-84871739995-
dc.identifier.hkuros221360-
dc.identifier.volume60-
dc.identifier.issue1-
dc.identifier.spage333-
dc.identifier.epage338-
dc.identifier.isiWOS:000316816200050-
dc.publisher.placeUnited States-

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