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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 16 — Aug. 15, 2014
  • pp: 4887–4890

Narsarsukite-structure fluorosilicate as a blue component for white LEDs: structural and optical properties

Yoon Hwa Kim and Won Bin Im  »View Author Affiliations


Optics Letters, Vol. 39, Issue 16, pp. 4887-4890 (2014)
http://dx.doi.org/10.1364/OL.39.004887


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Abstract

A new blue-emitting phosphor, K2ScSi4O10F:Eu2+ (KSSOF:Eu2+), was synthesized through a solid-state reaction. The structural and optical properties of KSSOF:Eu2+ phosphor, in addition to its thermal quenching and fabrication of white LEDs (WLEDs), were investigated for the first time. The phosphor showed broad blue emission, with a maximum at 434nm under near-ultraviolet excitation due to 5d4f transition of the Eu2+ ion. The critical distance was calculated to be 12 Å using the critical concentration of Eu2+ and Dexter’s theory for energy transfer. WLEDs were fabricated by blending KSSOF:Eu2+, commercial Lu3Al5O12:Ce3+, and (Sr,Ca)AlSiN3:Eu2+ phosphors, showed a high color rendering index of 88 at a correlated color temperature of 4134 K under a forward bias current of 100 mA.

© 2014 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence

ToC Category:
Spectroscopy

History
Original Manuscript: June 23, 2014
Revised Manuscript: July 15, 2014
Manuscript Accepted: July 18, 2014
Published: August 14, 2014

Citation
Yoon Hwa Kim and Won Bin Im, "Narsarsukite-structure fluorosilicate as a blue component for white LEDs: structural and optical properties," Opt. Lett. 39, 4887-4890 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-16-4887


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