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

Journal Article · Mon Dec 15 04:00:00 EST 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.09.076· OSTI ID:22420724

Kumar, Mithlesh; Mohapatra, M.; Natarajan, V.

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 the oxygen radical to be responsible for the observed glow peak.

• OSTI ID: 22420724
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 60; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

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