標題: Eu2+-activated silicon-oxynitride Ca3Si2O4N2: a green-emitting phosphor for white LEDs
作者: Chiu, Yi-Chen
Huang, Chien-Hao
Lee, Te-Ju
Liu, Wei-Ren
Yeh, Yao-Tsung
Jang, Shyue-Ming
Liu, Ru-Shi
應用化學系
Department of Applied Chemistry
公開日期: 9-May-2011
摘要: The green-emitting phosphor Ca3Si2O4N2:Eu2+ was synthesized using a solid-state reaction. The luminescence properties, diffuse reflection spectrum, and thermal quenching were firstly studied, and a white light-emitting diode (wLED) was fabricated using the Eu2+-activated Ca3Si2O4N2 phosphor. Eu2+-doped Ca3Si2O4N2 exhibited a broad green emission band centered between 510 and 550 nm depending on the concentration of Eu2+. The optimal doping concentration of Eu2+ in Ca3Si2O4N2 was 1 mol%. The energy transfer between Eu2+ ions proceeds by an electric multipolar interaction mechanism, with a critical transfer distance of approximately 30.08 angstrom. A wLED with an color-rendering index R-a of 88.25 at a correlated color temperature of 6029 K was obtained by combining a GaN-based n-UV LED (380 nm) with the blue-emitting BaMgAl10O17:Eu2+, green-emitting Ca3Si2O4N2: Eu2+, and red-emitting CaAlSiN3:Eu2+ phosphors. The results present Ca3Si2O4N2:Eu2+ as an attractive candidate for use as a conversion phosphor for wLED applications. (C) 2011 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.19.00A331
http://hdl.handle.net/11536/150301
ISSN: 1094-4087
DOI: 10.1364/OE.19.00A331
期刊: OPTICS EXPRESS
Volume: 19
Issue: 10
起始頁: 0
結束頁: 0
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