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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 9 — Apr. 27, 2009
  • pp: 7450–7457

Enhanced forward efficiency of Y3Al5O12:Ce3+ phosphor from white light-emitting diodes using blue-pass yellow-reflection filter

Jeong Rok Oh, Sang-Hwan Cho, Yong-Hee Lee, and Young Rag Do  »View Author Affiliations


Optics Express, Vol. 17, Issue 9, pp. 7450-7457 (2009)
http://dx.doi.org/10.1364/OE.17.007450


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Abstract

This paper reports a simple approach for the design of blue-excitation-light passing and phosphor-yellow-emission-light reflecting dielectric multilayers to recycle the backward emission of Y3Al5O12:Ce3+ (YAG:Ce) yellow phosphors on top of a blue InGaN light-emitting diode (LED) cup. The insertion of modified quarter-wave films of alternate high- and low-refractive index dielectric films (TiO2/SiO2) into the interface between a YAG:Ce phosphor layer and glass substrate resulted in 1.64 and 1.95 fold increase in efficiency and luminous efficacy of the forward white emission compared with that of a conventional phosphor on top of a blue LED cup with a lower correlated color temperature (< 4000K).

© 2009 OSA

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(230.3670) Optical devices : Light-emitting diodes
(310.1620) Thin films : Interference coatings

ToC Category:
Thin Films

History
Original Manuscript: January 30, 2009
Revised Manuscript: April 17, 2009
Manuscript Accepted: April 19, 2009
Published: April 21, 2009

Citation
Jeong Rok Oh, Sang-Hwan Cho, Yong-Hee Lee, and Young Rag Do, "Enhanced forward efficiency of Y3Al5O12:Ce3+ phosphor from white light-emitting diodes using blue-pass yellow-reflection filter," Opt. Express 17, 7450-7457 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-9-7450


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