Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403931 | Journal of Luminescence | 2007 | 4 Pages |
Abstract
Ce3+-doped SrAl2O4 single-crystal fibers have been prepared by laser-heated pedestal growth method. A broad emission band peaking at 385Â nm and originating from the Ce3+ 5d-4f transition is observed with excitations at 340, 320, 291, and 259Â nm, which correspond to the crystal field splitting components of the Ce3+ 5d states in SrAl2O4. The emission shows strong persistence for longer than 10Â h after UV radiation at 254Â nm from mercury lamp. Trapping dynamics of 5d electrons of Ce3+ in SrAl2O4 host is studied. The electron traps at 0.75Â eV are found to be responsible for the long persistent phosphorescence. Excitation-dependent thermoluminescence spectra are also recorded and analyzed. The lowest 5d state of Ce3+ in SrAl2O4 is found to be about 0.1Â eV below the host conduction band.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Dongdong Jia, Xiao-jun Wang, W. Jia, W.M. Yen,