期刊
RADIATION MEASUREMENTS
卷 80, 期 -, 页码 38-45出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radmeas.2015.07.002
关键词
Sr3Al2O5Cl2; Eu2+; Pr3+; Photoluminescence; Thermoluminescence; Long afterglow
资金
- National Natural Science Foundation of China [21271049]
The Sr3Al2O5Cl2:Eu2+, Pt3+ phosphor has been synthesized via high temperature solid state reaction. The X-ray powder diffraction confirms that the obtained samples are pure orthorhombic Sr3Al2O5Cl2 phases, with a space group of D2(4)-P2(1)2(1)2(1). Bluegreen emission is observed when the sample is doped with Pr3+ ions and an orange red emission with Eu2+ ions doping. Both of the samples show obvious afterglow emission. The intensity and lifetime of such afterglow can be substantially enhanced in the case of Pr3+ - Eu2+ co-doped, whose afterglow can last for approximately 300 min in the dark and the intensity is five times higher than the sample single doped with Eu2+. According to the thermoluminescence glow curves, the trap depth of these double-doped samples is about 0.95 eV, which is suitable for the generation of afterglow luminescence. And Pr3+ ions help to enhance the traps concentrations and modify the trap depth, which contributes to prolong the afterglow duration and increase the afterglow intensity of the phosphors. Finally, a feasible explanation of this afterglow generation is also discussed in this work. (C) 2015 Elsevier Ltd. All rights reserved.
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