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Mechanoluminescence properties of gamma‐ray‐irradiated BaSO 4 :Eu phosphors
Author(s) -
Upadhyay A. K.,
Dhoble S. J.,
Kher R S
Publication year - 2010
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1254
Subject(s) - mechanoluminescence , phosphor , irradiation , radiochemistry , gamma ray , materials science , chemistry , physics , nuclear physics , optoelectronics
BaSO 4 activated with various concentrations of Eu were prepared by solid‐state reaction technique. Thermoluminescence (TL) and mecanoluminescence (ML) of γ ‐ray‐irradiated BaSO 4 :Eu 2 O 3 phosphors were recorded. In the TL glow curve of the phosphor a single peak at 170°C was observed. The TL of the phosphors were also recorded after deforming the phosphors by dropping a piston of mass 0.4 kg onto them with different impact velocities. TL intensity (after deformation) decreased with increasing the impact velocity. In the ML intensity vs time curve two peaks were observed. ML intensity increased with increasing impact velocity of the piston and the time corresponding to peak ML intensity shifted to a shorter time value. ML intensity decreased drastically when it was recorded after annealing the sample at 170°C. The BaSO 4 phosphors activated with 0.1 mol% of Eu 2 O 3 showed optimum TL and ML. The photoluminescence emission spectrum of the sample showed that Eu enters as Eu 2+ ion in host lattice. Copyright © 2010 John Wiley & Sons, Ltd.