LiY_(1-x)Eu_x(MoO_4)_2 as a promising red-emitting phosphor of WLEDs synthesized by sol-gel process  

作　　者：周贤菊 周桐辉 李英茂 冯乔春 

机构地区：[1]Department of Mathematics and Physics,Chongqing University of Posts and Telecommunications [2]Chongqing Zhongtian Chemical In-dustry Co.Ltd.

出　　处：《Journal of Rare Earths》2012年第4期315-319,共5页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China (20903123);Key Project of Chinese Ministry of Education (211154);Natural Science Foundation Project of Chongqing (CSTC2010BA4009, KJTD201016 and CSTCjjA50006)

摘　　要：A series of LiY1-xEux（MoO4）2 red-emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray diffraction （XRD） and photo-luminescence （PL） spectra respectively. The effect of Eu3＋ doping concentration, annealing temperature and the molar ratio of citric acid to the total metal cations （C：M） on the optical properties of the red phosphors were studied and optimized. It was found that all the samples could be excited efficiently by blue light （465 nm）, which was well coincident with the emission of GaN based LED chips. The luminescent intensity reached maximum when annealing temperature was 750 ℃ and Eu3＋ doping concentration was 5% with C：M=3：1.A series of LiY1-xEux（MoO4）2 red-emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray diffraction （XRD） and photo-luminescence （PL） spectra respectively. The effect of Eu3＋ doping concentration, annealing temperature and the molar ratio of citric acid to the total metal cations （C：M） on the optical properties of the red phosphors were studied and optimized. It was found that all the samples could be excited efficiently by blue light （465 nm）, which was well coincident with the emission of GaN based LED chips. The luminescent intensity reached maximum when annealing temperature was 750 ℃ and Eu3＋ doping concentration was 5% with C：M=3：1.

关 键 词：LiY1-xEux（MoO4）2 red phosphor white LEDs sol-gel technique rare earths 

分 类 号：O614.33[理学—无机化学]