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Title: On the photo and thermally stimulated luminescence properties of U doped SrBPO{sub 5}

Highlights: • Synthesis of SrBPO{sub 5}:U phosphor by solid state route. • Confirmed the stabilization of uranium as UO{sub 2}{sup 2+}. • Evaluation of order of kinetics and trap parameters of the system. • ESR-TSL correlation of the observed glow peak. • Probable mechanism proposed for the TSL glow peak. - Abstract: Un-doped and uranium doped SrBPO{sub 5} samples were synthesized using solid-state reaction route and investigated for their photo and luminescence properties. Photoluminescence (PL) spectrum of uranium doped sample showed five peaks at 502, 524, 547, 569 and 597 nm. The average frequency of symmetric stretching of O=U=O in the ground electronic state was found to be about 757 cm{sup −1}. PL decay time measurements on the system confirmed the stabilization of uranium as UO{sub 2}{sup 2+} in the matrix. Thermally stimulated luminescence (TSL) measurements carried out on gamma irradiated SrBPO{sub 5}:U sample showed a glow peak at 390 °K, whose spectral characteristics was found to be typical of UO{sub 2}{sup 2+}. The trap parameters were evaluated using different heating rate method. Room temperature EPR data suggested the formation of borate and oxygen based radical centers in the gamma-irradiated sample. Detailed EPR-TSL correlation studies confirmed the destruction of themore » oxygen radical to be responsible for the observed glow peak.« less
Authors:
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Publication Date:
OSTI Identifier:
22420724
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORATES; BORON PHOSPHATES; CORRELATIONS; DOPED MATERIALS; ELECTRON SPIN RESONANCE; HEATING RATE; IRRADIATION; MATRIX MATERIALS; OXYGEN; PARAMAGNETISM; PHOTOLUMINESCENCE; STABILIZATION; STRONTIUM COMPOUNDS; TEMPERATURE RANGE 0273-0400 K; THERMOLUMINESCENCE; TRAPS; URANIUM; URANIUM DIOXIDE; URANIUM NITRIDES