Fabrication and photoluminescence characteristics of novel red-emitting Ba_(2)LuNbO_(6):Eu^(3+)double-perovskite phosphors on near UV WLEDs  

作　　者：Haihong Guo Ting Wang Bitao Liu Wei Gao Liang Xiu Zhenen Cui Hao Zhang Qianrui Ma Shaoqing Wang Ziyang Li Longchao Guo Guilong Yan Siufung Yu Xue Yu Xuhui Xu Jianbei Qiu 

机构地区：[1]College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China [2]The Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong 999077,China [3]Research Institute for New Materials Technology,Chongqing University of Arts and Sciences,Chongqing 402160,China [4]College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China [5]School of Mechanical Engineering,Chengdu University,Chengdu 610059,China

出　　处：《Journal of Rare Earths》2022年第8期1173-1180,共8页稀土学报（英文版）

基　　金：Project supported by the Excellent Youth Project of Yunnan Province Applied Basic Research Project(2019FI001);the National Natural Science Foundation of China(61775187,61965012,12064022);the Key Project of Yunnan Provincial Natural Science Foundation(202101AT070126)。

摘　　要：Red emitting phosphors play a significant role in accelerating the improvement of illumination quality for white light emitting diodes(WLEDs).In this work,by using solid-state reaction method,an efficient novel Ba_(2)LuNbO_(6):Eu^(3+)phosphor with double-perovskite structure was successfully prepared.Here,a series of Ba_(2)LuNbO_(6):Eu^(3+)red phosphors can be efficiently pumped by the near-ultraviolet(UV)light and then present high-brightness at orange emission(598 nm,~5D_(0)→~7 F_(1))and red emission(610 nm,~5D_(0)→~7 F_(2)).The ratio values of 610 to 598 nm in Ba_(2)LuNbO_(6):Eu^(3+)phosphors exceed 1 when the content of Eu^(3+)is larger than 0.4 mol,because the occupation of Eu^(3+)ions is changed from Lu^(3+)ions with symmetric sites to Ba^(2+)ions with asymmetric sites.Besides,the optimized concentration of Eu^(3+)at the~5D_(0)→~7 F_(2)transitions is obtained when x=1,indicating that there is non-concentration quenching in Ba_(2)LuNbO_(6):Eu^(3+)phosphors.Moreover,the CIE chromaticity coordinates of Ba_(2)LuNbO_(6):Eu^(3+)was calculated to be(0.587,0.361),the color purity was calculated to be 72.26%and internal quenching efficiency(IQE)was measured to be 67%.Finally,the thermal stability of Ba_(2)LuNbO_(6):Eu^(3+)phosphors was also studied.Our work demonstrates that the novel double-perovskite red-emitting Ba_(2)LuNbO_(6):Eu^(3+)phosphors are prospective red emitting elements for WLEDs applications.

关 键 词：Ba_(2)LuNbO_(6):Eu^(3+) phosphors Non-concentration quenching DOUBLE-PEROVSKITE Red emitting Rare earths 

分 类 号：TQ422[化学工程] TN312.8[电子电信—物理电子学]