Document Detail


Phosphor converted LEDs with omni-directional-reflector coating.
MedLine Citation:
PMID:  20052060     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A packaging scheme utilizing omni-directional reflective (ODR) optical coating is described to enhance the light extraction of near UV excited, phosphor-converted LEDs. A simple 1D model was developed to analyze the spectra of the extracted light measured with an integration-sphere as a function of phosphor layer concentration and thickness. Quantitative determination of the absorption coefficients at the pump and fluorescent light wavelength along with the conversion coefficient of phosphors were obtained. The reflection of the ODR film and the back reflector are also characterized. These parameters are then used for efficiency optimization of the present packaging scheme. A maximum enhancement of 40% can be expected with the materials and the configuration used in the present work.
Authors:
Jim-Yong Chi; Ji-Siao Chen; Chuan-Yu Liu; Cheng-wen Chu; Kuo-Hsien Chiang
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Optics express     Volume:  17     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-01-06     Completed Date:  2010-03-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  23530-5     Citation Subset:  IM    
Affiliation:
Institute of Opto-Electronics Engineering, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C. chij@mail.ndhu.edu.tw
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MeSH Terms
Descriptor/Qualifier:
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Lenses*
Light
Lighting / instrumentation*
Scattering, Radiation
Semiconductors*

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


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