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TL and PL in BaSr(SO 4 ) 2 :Eu mixed sulphate
Author(s) -
Salah Numan,
Sahare P. D.,
Kumar Pratik
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521139
Subject(s) - materials science , condensed matter physics , chemistry , physics
A highly sensitive thermoluminescent (TL) phosphor based on BaSr(SO 4 ) 2 :Eu has been developed. The phosphor was recrystallized from H 2 SO 4 solution by evaporation. Photoluminescence studies of this mixed‐sulphate phosphor show that Eu is incorporated in the host in its divalent (emission at 383 nm) as well as trivalent (emissions at 575 and 731 nm) form due to 4f 6 5d → 8 S 7/2 and 5 D 0 → 7 F j transitions, respectively. The intensity of the 383 nm band increases with increasing irradiation, while that of the 731 nm band decreases, showing Eu 3+ → Eu 2+ conversion. The TL glow curve of the BaSr(SO 4 ) 2 :Eu material shows a single peak at 470 K along with a small shoulder at around 428 K. The relative intensities of these peaks are found to vary with γ‐ray exposure. The TL sensitivity of the mixed‐sulphate phosphor is nearly 2.5, 7 and 1.2 times higher than those of BaSO 4 :Eu, SrSO 4 :Eu and CaSO 4 :Dy phosphors, respectively. The annealing temperature and the impurity concentration effects are also studied. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)