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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 23 — Dec. 1, 2007
  • pp: 3444–3446

White light emission from blue and near ultraviolet light-emitting diodes precoated with a Sr 3 SiO 5 : Ce 3 + , Li + phosphor

Ho Seong Jang and Duk Young Jeon  »View Author Affiliations


Optics Letters, Vol. 32, Issue 23, pp. 3444-3446 (2007)
http://dx.doi.org/10.1364/OL.32.003444


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Abstract

White-light-emitting diodes (WLEDs) were fabricated by combining a yellow Sr 3 SiO 5 : Ce 3 + , Li + phosphor with a blue light-emitting diode (LED) ( 460 nm chip) or a near ultraviolet (n-UV) LED ( 405 nm chip), respectively. Color temperature ( T c ) of Sr 3 SiO 5 : Ce 3 + , Li + -based WLEDs could be tuned from 6500 to 100,000 K (blue LED pumping) and from 4900 to 50,000 K (n-UV LED pumping) without mixing with other phosphors. The blue LED-pumped WLED showed excellent white light (luminous efficiency= 31.7 lm W , T c = 6857 K ) at 20 mA . This WLED showed a stable color coordinates property against an increase of the forward current. An n-UV LED-pumped WLED also showed bright white light ( 25.0 lm W , 5784 K ) at 20 mA .

© 2007 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: August 14, 2007
Revised Manuscript: October 11, 2007
Manuscript Accepted: October 12, 2007
Published: November 28, 2007

Citation
Ho Seong Jang and Duk Young Jeon, "White light emission from blue and near ultraviolet light-emitting diodes precoated with a Sr3SiO5:Ce3+,Li+ phosphor," Opt. Lett. 32, 3444-3446 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-23-3444


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