Document Detail


Spectral conversion with fluorescent microspheres for light emitting diodes.
MedLine Citation:
PMID:  18521128     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An innovative spectral conversion scheme for light emitting diodes using fluorescent microspheres has been demonstrated. An optimally mixed proportion of green and red fluorescent microspheres were coated onto a high-extraction-efficiency GaN micro-LED with emission centred at 470 nm. The microspheres self-assemble into ordered hexagonally arrays, forming regular and uniform coating layers. Devices with cool and warm white emission were achieved. The bluish-white LED has a luminous efficacy of 27.3 lm/W (at 20 mA) with CIE coordinates of (0.26, 0.28) and 8500K CCT, while the yellowish-white LED has a luminous efficacy of 26.67 lm/W (at 20 mA) with CIE coordinates of (0.36, 0.43) and 13000K CCT.
Authors:
K N Hui; P T Lai; H W Choi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Optics express     Volume:  16     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-06-03     Completed Date:  2008-08-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  13-8     Citation Subset:  IM    
Affiliation:
Department of Electrical and Electronic Engineering, University of Hong Kong.
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MeSH Terms
Descriptor/Qualifier:
Color*
Equipment Design
Equipment Failure Analysis
Lighting / instrumentation*,  methods
Microspheres
Semiconductors*
Spectrometry, Fluorescence / instrumentation*,  methods

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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