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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 33, Iss. 18 — Sep. 15, 2008
  • pp: 2140–2142

Origin of the discrepancy between photoluminescence brightness of TAG:Ce and electroluminescence brightness of TAG:Ce-based white LED expected from phosphor brightness

Ho Seong Jang, Jong Hyuk Kang, Yu-Ho Won, Kun-Mo Chu, and Duk Young Jeon  »View Author Affiliations


Optics Letters, Vol. 33, Issue 18, pp. 2140-2142 (2008)
http://dx.doi.org/10.1364/OL.33.002140


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Abstract

A yellow-emitting Tb 3 Al 5 O 12 : Ce 3 + (TAG:Ce) phosphor was coated on blue light-emitting diodes (LEDs) to obtain white LEDs (WLEDs). Since TAG:Ce showed 90% of the brightness of Y 3 Al 5 O 12 : Ce 3 + (YAG:Ce), it was expected that TAG:Ce-based WLEDs showed 90% of brightness of YAG:Ce-based ones. However, the TAG:Ce-based WLED showed 74% of the brightness of YAG:Ce-based one. Considering the density and size of the phosphors, the higher density and larger size of TAG:Ce induced a great deal of sedimentation of TAG:Ce particles in an epoxy resin. It is believed that this is one of main reasons for the reduced optical power of the TAG:Ce-based WLED compared to that of the WLED expected from the brightness of TAG:Ce.

© 2008 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Optical Devices

History
Original Manuscript: July 16, 2008
Revised Manuscript: August 15, 2008
Manuscript Accepted: August 15, 2008
Published: September 12, 2008

Citation
Ho Seong Jang, Jong Hyuk Kang, Yu-Ho Won, Kun-Mo Chu, and Duk Young Jeon, "Origin of the discrepancy between photoluminescence brightness of TAG:Ce and electroluminescence brightness of TAG:Ce-based white LED expected from phosphor brightness," Opt. Lett. 33, 2140-2142 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-18-2140


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References

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