標題: Intense blue-emitting Ca2PO4Cl:Eu2+ phosphor for near-ultraviolet converting white light-emitting diodes
作者: Chiu, Yi-Chen
Liu, Wei-Ren
Chang, Chun-Kuei
Liao, Cheng-Chun
Yeh, Yao-Tsung
Jang, Shyue-Ming
Chen, Teng-Ming
應用化學系
Department of Applied Chemistry
關鍵字: Ca2PO4Cl:Eu2+;phosphors;luminscense;rare earths
公開日期: 1-十二月-2010
摘要: A blue phosphor Ca2PO4Cl:Eu2+ (CAP:Eu2+) was synthesized by solid state reaction. The Ca2PO4Cl:Eu2+ exhibited high quantum efficiency and excellent thermal stability. The luminescent intensity of Ca2PO4Cl:Eu2+ was found to be 128% under excitation at 380 nm, 149% under 400 nm, and 247% under 420 nm as high as that of BaMgAl10O17:Eu2+. The optimal doping concentration was observed to 11 mol.% of CAP:Eu2+. The energy transfer between Eu2+ ions in CAP were occurred via electric multipolar interaction, and the critical transfer distance was estimated to be 1.26 nm. A mixture of blue-emitting Ca2PO4Cl:Eu2+, green-emitting (Ba,Sr)(2)SiO4:Eu2+ and red-emitting CaAlSiN3:Eu2+ phosphors were selected in conjunction with 400 nm chip to fabricate white LED devices. The average color-rendering index R-a and correlated color temperature (T-c) of the white LEDs were found to be 93.4 and 4590 K, respectively. The results indicated that it was a promising candidate as a blue-emitting phosphor for the near-UV white light-emitting diodes.
URI: http://dx.doi.org/10.1016/S1002-0721(10)60374-2
http://hdl.handle.net/11536/150242
ISSN: 1002-0721
DOI: 10.1016/S1002-0721(10)60374-2
期刊: JOURNAL OF RARE EARTHS
Volume: 28
Issue: 1
起始頁: 250
結束頁: 253
顯示於類別:期刊論文