期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 17, 页码 3004-3011出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc30182f
关键词
-
资金
- National Science Foundation for Distinguished Young Scholars [50925206]
A novel yellow emitting long-persistent phosphor Ca2BO3Cl:Eu2+, Dy3+ is developed. The incorporation of Dy3+ ions, which act as trap centers, largely extends the thermoluminescence characteristics and evidently enhances the persistent luminescence behavior of the phosphor. Both fluorescence and phosphorescence spectra of Ca2BO3Cl:Eu2+, Dy3+ reveal only one asymmetric broad emission band located at 580 nm, ascribed to the 5d-4f transitions of Eu2+ ions in two different sites. With the optimum doping concentration and sufficient excitation with UV light, the afterglow of samples can persist over 48 h above the recognizable intensity level (>= 0.32 mcd m(-2)), a phenomenon that is infrequent and excellent. Furthermore, Ca2BO3Cl possesses an indirect bandgap of about 5.1 eV. Detailed processes and possible mechanism are studied and discussed.
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