Intense blue-emitting Ca2PO4Cl:Eu2+ phosphor for near-ultraviolet converting white light-emitting diodes |
| |
Authors: | Yi-Chen Chiu,Wei-Ren Liu,Chun-Kuei Chang,Cheng-Chun Liao,Yao-Tsung Yeh,Shyue-Ming Jang,Teng-Ming Chen,.Material Chemical Research Laboratories,Industrial Technology Research Institute,Hsinchu,Taiwan,R.O.C ,.Phosphors Research Laboratory and |
| |
Affiliation: | Department of Applied Chemistry,National Chiao Tung University,Hsinchu 300,Taiwan,R.O.C;3.Electronics and Optoelectronics Research Laboratories,Industrial Technology Research Institute,Hsinchu 310,Taiwan,R.O.C.) |
| |
Abstract: | 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)2SiO4: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 Ra and correlated color temperature(Tc) 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. |
| |
Keywords: | Ca2PO4Cl:Eu2+ phosphors luminscense rare earths |
本文献已被 维普 等数据库收录! |
|