Optical properties of NaY（MoO4）2:Eu3+ nanophosphors prepared by molten salt method  

作　　者：Lin Bai Qingyu Meng Mingxue Huo Yu Sui 

机构地区：[1]Department of Physics,Harbin Institute of Technology,Harbin 150001,China [2]School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China [3]Research Center of Basic Space Science,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Rare Earths》2019年第12期1261-1268,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51002041)

摘　　要：We synthesized NaY(MoO4)2:Eu3+phosphors of different doping concentrations by a molten salt method.This facile way possesses advantages such as simple process,lower calcination temperature(350℃)and small particle size(70 nm).The crystal system is tetragonal phase and crystal lattice is body centered.The photo luminescence measurements including emission spectra,excitation spectra and fluorescence decay curves were carried out,elucidating that NaY(MoO4)2:Eu3+can be effectively excited by near UV and blue light.Moreover,it can be concluded that Eu3+energy transfer type is exchange interaction.Huang-Rhys factor and the critical energy transfer distance(Rc)were calculated to be 0.043 and 0.995 nm,respectively.Auzel’s model was used to obtain the intrinsic radiative transition lifetime of5 D0 level(τ0=0.923 ms).Furthermore,a calculation method was used to calculate refractive index n of nontransparent NaY(MoO4)2:1 mol%Eu3+phosphor,and n was obtained to be 1.86.We synthesized NaY（MoO4）2:Eu3+phosphors of different doping concentrations by a molten salt method.This facile way possesses advantages such as simple process,lower calcination temperature（350℃） and small particle size（70 nm）.The crystal system is tetragonal phase and crystal lattice is body centered.The photo luminescence measurements including emission spectra,excitation spectra and fluorescence decay curves were carried out,elucidating that NaY（MoO4）2:Eu3+can be effectively excited by near UV and blue light.Moreover,it can be concluded that Eu3+energy transfer type is exchange interaction.Huang-Rhys factor and the critical energy transfer distance（Rc） were calculated to be 0.043 and 0.995 nm,respectively.Auzel’s model was used to obtain the intrinsic radiative transition lifetime of5 D0 level（τ0=0.923 ms）.Furthermore,a calculation method was used to calculate refractive index n of nontransparent NaY（MoO4）2:1 mol% Eu3+phosphor,and n was obtained to be 1.86.

关 键 词：Energy transfer Red PHOSPHORS EU^3+ MOLYBDATES Rare earths 

分 类 号：O61[理学—无机化学]