کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403931 | 1505931 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Trapping processes of 5d electrons in Ce3+ doped SrAl2O4
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volumes 122â123, JanuaryâApril 2007, Pages 311-314
Journal: Journal of Luminescence - Volumes 122â123, JanuaryâApril 2007, Pages 311-314
نویسندگان
Dongdong Jia, Xiao-jun Wang, W. Jia, W.M. Yen,