Introduction In BaFCl crystal which is of PbFCl type structure in tetragonal system, Ba;ions situate at sites of C;point symmetry, while F;and Cl;ions occupy sites of D;and C;symmetry, respectively. The rare earth ion...Introduction In BaFCl crystal which is of PbFCl type structure in tetragonal system, Ba;ions situate at sites of C;point symmetry, while F;and Cl;ions occupy sites of D;and C;symmetry, respectively. The rare earth ions RE;doped in BaFCl should randomly replace the sites of Ba;ions, and their extra positive charges may be compensated by展开更多
The roles of different point defects in persistent luminescence of SrAl2O4:Eu,Dy phosphors were investigated. The research results showed that Dyer plays an important role in the persistent luminescence of SrA1EO4:E...The roles of different point defects in persistent luminescence of SrAl2O4:Eu,Dy phosphors were investigated. The research results showed that Dyer plays an important role in the persistent luminescence of SrA1EO4:Eu, Dy phosphors. It can serve as the electron trap of suitable depth for persistent luminescence. V~ does not serve as the electron trap of suitable depth, but its existence can increase the depth of electron traps. There is interaction between the Dy^3+( DySr ) and the Eu^2+(Eu^x Sr ), and only if the distance between the Dy^3+(DySr) and the Eu^2+ (Eu^x Sr) is close enough, the Dyer can work as an effective electron trap. The point defect of V" Sr can be hole trap, but the change of its density in crystal matrix does not arouse the obvious change of persistent luminescence.展开更多
基金Supported by the National Natural Science Foundation of China.
文摘Introduction In BaFCl crystal which is of PbFCl type structure in tetragonal system, Ba;ions situate at sites of C;point symmetry, while F;and Cl;ions occupy sites of D;and C;symmetry, respectively. The rare earth ions RE;doped in BaFCl should randomly replace the sites of Ba;ions, and their extra positive charges may be compensated by
基金This study is financially supported by the Jiangxi University of Finance and Economy (Project No. 0421205) Jiangxi Provincial Department of Education (Project No. (2007) 260)
文摘The roles of different point defects in persistent luminescence of SrAl2O4:Eu,Dy phosphors were investigated. The research results showed that Dyer plays an important role in the persistent luminescence of SrA1EO4:Eu, Dy phosphors. It can serve as the electron trap of suitable depth for persistent luminescence. V~ does not serve as the electron trap of suitable depth, but its existence can increase the depth of electron traps. There is interaction between the Dy^3+( DySr ) and the Eu^2+(Eu^x Sr ), and only if the distance between the Dy^3+(DySr) and the Eu^2+ (Eu^x Sr) is close enough, the Dyer can work as an effective electron trap. The point defect of V" Sr can be hole trap, but the change of its density in crystal matrix does not arouse the obvious change of persistent luminescence.