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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 26 — Sep. 10, 2009
  • pp: 4942–4946

Design and fabrication of white light emitting diodes with an omnidirectional reflector

Jung-Chieh Su, Chun-Lin Lu, and Cheng-Wei Chu  »View Author Affiliations


Applied Optics, Vol. 48, Issue 26, pp. 4942-4946 (2009)
http://dx.doi.org/10.1364/AO.48.004942


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Abstract

This study investigates white light emitting diodes (LEDs), packaged with an omnidirectional reflector (ODR) and UV LED of 378 ‚ÄČ nm . The current work designs an ODR to solve the problems of UV leak and low phosphors conversion efficiency with a thin film structure of S / ( H L H ) n / air modified from a quarter-wave stack. Since an ODR is a perfect dielectric mirror for UV light, the UV leak can be eliminated and recycled to enhance phosphors conversion efficiency. By measuring the emission spectrum of a white LED with an ODR, the orientation distribution of the color properties, and the radiation power, the current study did not detect any UV leak. The average luminous intensity enhancement is 15%.

© 2009 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4040) Optical devices : Mirrors
(230.4170) Optical devices : Multilayers
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Optical Devices

History
Original Manuscript: May 20, 2009
Revised Manuscript: August 13, 2009
Manuscript Accepted: August 13, 2009
Published: September 2, 2009

Citation
Jung-Chieh Su, Chun-Lin Lu, and Cheng-Wei Chu, "Design and fabrication of white light emitting diodes with an omnidirectional reflector," Appl. Opt. 48, 4942-4946 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-26-4942

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