Title: Novel yellowish-orange Sr(8)Al(12)O(24)S(2):Eu(2+) phosphor for application in blue light-emitting diode based white LED
Authors: Kuo, Te-Wen
Huang, Chien-Hao
Chen, Teng-Ming
Department of Applied Chemistry
Issue Date: 21-Jun-2010
Abstract: A new yellowish-orange phosphor, Sr(8)Al(12)O(24)S(2):Eu(2+), was synthesized by the solid-state method and its photoluminescence properties were investigated by excitation and emission spectra. Its excitation band is extending from 400-500 nm, which is adaptable to the emission band of blue LED chips (450-470 nm). Upon the excitation of 450 nm light, the phosphor exhibits strong yellowish-orange emission centered at 605 nm with good thermal stability. A white light-emitting diode (W-LED) that consists of a blue LED chip (similar to 470 nm) and a (Sr(0.92)Eu(0.08))(8)Al(12)O(24)S(2) phosphor is demonstrated. The CIE 1931 chromaticity coordinates (x, y) are (0.34, 0.25), the correlated color temperature (CCT) is 4300 K, and the luminous efficacy of this W-LED is 14.2 1m/W at room temperature and with a forward-bias current of 400 mA. (C) 2010 Optical Society of America
URI: http://hdl.handle.net/11536/5253
ISSN: 1094-4087
Volume: 18
Issue: 13
Begin Page: A231
End Page: A236
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