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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 11 — May. 24, 2010
  • pp: 11063–11072

Full down-conversion of amber-emitting phosphor-converted light-emitting diodes with powder phosphors and a long-wave pass filter

Jeong Rok Oh, Sang-Hwan Cho, Hoo Keun Park, Ji Hye Oh, Yong-Hee Lee, and Young Rag Do  »View Author Affiliations


Optics Express, Vol. 18, Issue 11, pp. 11063-11072 (2010)
http://dx.doi.org/10.1364/OE.18.011063


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Abstract

This paper reports the possibility of a facile optical structure to realize a highly efficient monochromatic amber-emitting light-emitting diode (LED) using a powder-based phosphor-converted LED combined with a long-wave pass filter (LWPF). The capping of a blue-reflecting and amber-passing LWPF enhances both the amber emission from the silicate amber phosphor layer and the color purity due to the blocking and recycling of the pumping blue light from the InGaN LED. The enhancement of the luminous efficacy of the amber pc-LED with a LWPF (phosphor concentration 20 wt%, 39.4 lm/W) is 34% over that of an amber pc-LED without a LWPF (phosphor concentration 55 wt%, 29.4 lm/W) at 100 mA and a high color purity (> 96%) with Commission International d’Eclairage (CIE) color coordinates of x = 0.57 and y = 0.42.

© 2010 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.0230) Optical devices : Optical devices
(230.1480) Optical devices : Bragg reflectors
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Optical Devices

History
Original Manuscript: March 29, 2010
Revised Manuscript: April 22, 2010
Manuscript Accepted: May 3, 2010
Published: May 11, 2010

Citation
Jeong Rok Oh, Sang-Hwan Cho, Hoo Keun Park, Ji Hye Oh, Yong-Hee Lee, and Young Rag Do, "Full down-conversion of amber-emitting phosphor-converted light-emitting diodes with powder phosphors and a long-wave pass filter," Opt. Express 18, 11063-11072 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-11-11063


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