Synthesis,crystal structure and photoluminescence properties of novel double perovskite La2CaSnO6:Eu3+red-emitting phosphors  

作　　者：Yangyi Xu Guifang Li Xufeng Guan Yunge Wei Maolin Zhang 

机构地区：[1]School of Advanced Materials and Nano Technology,Xidian University,Xi'an710071,China

出　　处：《Journal of Rare Earths》2022年第11期1682-1690,I0001,共10页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(61974114)。

摘　　要：A series of new double perovskite LaEuCaSnO(0≤x≤0.8)red phosphors were synthesized by traditional solid-state reaction.The phase,micro structure,photoluminescence(PL)properties,quantum efficiency,and thermal stability of the phosphors were investigated.LaCaSnOmatrix has a monoclinic double perovskite structure with space group P2/n.Under near-ultraviolet(UV)light at395 nm,LaEuCaSnOphosphors exhibit the most typical red emission peak at 614 nm,which corresponds to~5 D→~7 Felectric dipole transition of Eu.The optimum Eudoping content is attained at x=0.5,and the LaEuCaSnOphosphor shows a moderate quantum efficiency(32.3%)and high color purity(92.2%).Besides,the temperature-dependent spectrum of the phosphor was studied.The emission intensity of Euat 423 K decreases to 70.94%of the initial intensity at 303 K,and the activation energyΔE is estimated to be 0.232 eV,suggesting that the phosphors possess good thermal stability.The fabricated w-LED based on the phosphors has higher Ra(89),lower CCT(4539 K),and better chromaticity coo rdinates(0.371,0.428).These results prove that the Eu-doped LaCaSnOred phosphor has great potential applications in w-LEDs.

关 键 词：PHOSPHORS Double perovskite Luminescence properties La2CaSnO6 Rare earths 

分 类 号：TB34[一般工业技术—材料科学与工程] TN312.8[电子电信—物理电子学]