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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 18414–18423

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, and Shih-Peng Chen  »View Author Affiliations


Optics Express, Vol. 21, Issue 15, pp. 18414-18423 (2013)
http://dx.doi.org/10.1364/OE.21.018414


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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.

© 2013 Optical Society of America

OCIS Codes
(150.2950) Machine vision : Illumination
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.3670) Optical devices : Light-emitting diodes
(150.2945) Machine vision : Illumination design
(080.4295) Geometric optics : Nonimaging optical systems

ToC Category:
Optical Devices

History
Original Manuscript: April 22, 2013
Revised Manuscript: June 18, 2013
Manuscript Accepted: July 16, 2013
Published: July 24, 2013

Citation
Ching-Cherng Sun, Shuang-Chao Chung, Shuang-Hao Yang, Yeh-Wei Yu, Wei-Ting Chien, Huang-Kuen Chen, and Shih-Peng Chen, "High-directional light source using photon recycling with a retro-reflective Dome incorporated with a textured LED die surface," Opt. Express 21, 18414-18423 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-15-18414


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