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 |