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Study on the PSL mechanism in BaFCI:Eu2+ phosphors

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In this paper, the ESR and photoluminescence (PL) of BaFCl and BaFCl:Eu2+ radiated or un-radiated by X-ray were observed. The single electron in the color center could be produced in BaFCl without Eu2+. A series of traps of different energy level in BaFCl lattice were formed, and some shallow traps of them could be bleached by Vis-light, and the other deep traps could not. The bleaching effects on ESR and photostimulated luminescence (PSL) were investigated. An F–H–Eu2+ complex (F color center, H color center and Eu2+ complex) in the lattice of BaFCl:Eu2+ was suggested when the phosphor was X-ray irradiated. The Eu2+ located in the complex has only contribution to the ESR signal, but has no contribution to PL spectrum. The excitation of both F-center and located Eu2+ could decompose the complex to induce bleaching. The 440 nm light could excite the F-centers and the 220 nm and 270 nm could excite the located Eu2+, and the excitation disturbed the F–H–Eu2+ complex and caused a decrease of the PSL.

Affiliations: 1: School of Chemistry & Chemical Engineering, Shanghai Jiao-tong University, Shanghai 200240, China; 2: Lab. for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China


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