Subramaniam, N. G.; Selvasekarapandian, S.; Bhavani, G.; Kang, T. W.; Pal, H. (RC&CDD)
Source
Optical Materials, 2004. Vol. 27: pp. 515-519
ABSTRACT
CsBr0.9I0.1:Eu2+ crystals were grown by Bridgman technique. Optical absorption spectrum of the unirradiated CsBr0.9I0.1:Eu2+ crystals show absorption bands at 270 nm and 340 nm. Irradiated CsBr0.9I0.1:Eu2+ shows single F band for F(Br-) and F(I-) centers at 730nm. Conversion of Eu2+ to Eu3+ after irradiation is confirmed by optical absorption technique. Sharp and single Photoluminescence (PL) emission band is observed at 440 nm for CsBr0.9I0.1:Eu2+ crystals. Photostimulated Luminescence (PSL) emission band observed for CsBr0.9I0.1:Eu2+ crystals at 442 nm due to excitation at 730 nm shows that the F centers are photostimulable. PSL emission intensity increases linearly with irradiation dose up to 2.5Krad.