High-directional light source using photon recycling with a retro-reflective Dome incorporated with a textured LED die surface

Ching Cherng Sun, Shuang Chao Chung, Shuang Hao Yang, Yeh Wei Yu, Wei Ting Chien, Huang Kuen Chen, Shih Peng Chen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)18414-18423
Number of pages10
JournalOptics Express
Volume21
Issue number15
DOIs
StatePublished - 29 Jul 2013

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