He X.,Jiangsu Teachers University of Technology |
He X.,Jiangsu Province Key Laboratory of Precious Metal ChemistryandTechnology |
Guan M.,Jiangsu Teachers University of Technology |
Guan M.,Jiangsu Province Key Laboratory of Precious Metal ChemistryandTechnology |
And 8 more authors.
Journal of Materials Research | Year: 2011
A series of red-emitting phosphors with compositions of La 2(Mo1-zSiz)2O9:0. 05Eu3+ (0 ≤ z ≤ 0.10) with strong near-UV absorption were prepared by solid-state method. The structure and luminescence properties were investigated by x-ray powder diffraction, UV-vis diffuse reflectivity, and photoluminescence spectra. The luminescent properties as a function of Si 4+ concentrations were systematically studied. Under excitation of a wide range near-UV (250-430 nm) or blue light, Si4+-doped series phosphors exhibit characteristic red emission of Eu3+ peaked at 615 nm. The incorporation of Si4+ into La2Mo2O 9:0.05Eu3+ phosphor leads to the improvement of the excitation broad band and sharp peaks, as well as the broadening of charge transfer band. Appropriate amount of Si4+ doping can enhance the red luminescence intensity. Finally, the possible reasons for the luminescence enhancement via the corporation of Si4+ were explained. © 2011 Materials Research Society. Source