Document Detail

High-directional light source using photon recycling with a retro-reflective Dome incorporated with a textured LED die surface.
MedLine Citation:
PMID:  23938713     Owner:  NLM     Status:  In-Data-Review    
This paper demonstrates a novel retro-reflective dome that enhances the directionality of a light emitting diode (LED) by recycling photons reflected by a textured LED die surface. A simulation model is developed to describe both the photon recycling process within the dome and the role of specific pyramid patterns on the top surface of the LED die. Advanced simulations showed that a perfectly polished surface with 100% reflectivity potentially enhances the directionality of the dome by 340%, 250%, and 240% using reflective domes with 10°, 20°, and 30° light cones, respectively. In the experiment, the directionality of the domes exhibiting surface imperfections is enhanced by approximately 160%, 150%, and 130% using 10°, 20°, and 30° light cones, respectively. By incorporating a textured top surface on the LED die, the proposed dome effectively increases the directionality of the LED light source.
Ching-Cherng Sun; Shuang-Chao Chung; Shuang-Hao Yang; Yeh-Wei Yu; Wei-Ting Chien; Huang-Kuen Chen; Shih-Peng Chen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  21     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-08-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18414-23     Citation Subset:  IM    
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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