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Luminescence Properties and Energy Transfer in La5-x-ySi2BO13:xCe3+, yTb3+ Phosphor

Journal paper
Hui Xu, Zhiguo Xiaz, Haikun Liu and Libing Liao
ECS J. Solid State Sci. Technol. 2013 volume 2, issue 9, R186-R189

Abstract

paper1

La5-x-ySi2BO13:xCe3+, yTb3+ phosphors were synthesized by a solid-state reaction, and their luminescence properties have been investigated. The luminescent emission (PL) and excitation (PLE) spectra reveal that a broad absorption band between 200–400 nm is ascribed to the sensitizer of Ce3+, and the multiple emission bands are corresponding to the characteristic transitions of Ce3+ and Tb3+, respectively. On the basis of the analysis of the luminescence spectra, the energy transfer from Ce3+ to Tb3+ ions takes place in the La5-x-ySi2BO13:xCe3+, yTb3+ phosphor, which demonstrated to be a dipole-dipole mechanism. The energy transfer efficiency increases with increasing Ce3+ doping content. The critical distance Rc of Ce3+ to Tb3+ ions in La5Si2BO13 host was calculated to be 0.973 nm.