Tb{sup 3+} induced orange persistent luminescence in Cs{sub 2}CaP{sub 2}O{sub 7}:Eu{sup 2+}: The role of the auxiliary codopant
Highlights: • The orange persistent luminescence of Cs{sub 2}CaP{sub 2}O{sub 7}:Eu{sup 2+},Tb{sup 3+} was first reported. • The role of Tb{sup 3+} was discussed. • The TL curve reveals there are two traps responsible for the persistent luminescence. - Abstract: This study reports an orange emitting persistent phosphor Cs{sub 2}CaP{sub 2}O{sub 7}:Eu{sup 2+},Tb{sup 3+}. The material was synthesized by solid state reaction method in a reducing atmosphere. The persistent phosphor was characterized in detail by X-ray powder diffraction, photoluminescence, persistent luminescence and thermoluminescence spectra. After UV irradiation, Cs{sub 2}CaP{sub 2}O{sub 7}:Eu{sup 2+},Tb{sup 3+} phosphor shows an orange persistent luminescence (∼590 nm) at room temperature, whereas only photoluminescence is observed in Eu{sup 2+} singly doped samples. Both of the photoluminescence and persistent luminescence is due to the 4f{sup 6}5d{sup 1} → 4f{sup 7} transition of Eu{sup 2+} and the emission lines of Tb{sup 3+} are totally absent. The deconvolution of the thermoluminescence curve reveals there are two kinds of traps responsible for the persistent luminescence. The depth of the dominating trap is 0.61 eV. Based on experimental results, the role of Tb{sup 3+} and the trapping/detrapping processes of charge carriers were discussed. An energy level scheme was proposed to explain the mechanisms of persistent luminescence as well as photoluminescence.
- OSTI ID:
- 22730390
- Journal Information:
- Materials Research Bulletin, Vol. 93; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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