he photolummescence and electron spin resonance properties of gamma irradiated (up to 500 kGy) porous silica are reported. By exciting at 5.6 eV a photoluminescence contribution can be detected before irradiation, peaked at about 4.1 eV. Gamma irradiation causes the generation of the E' centers (about 1 x 10(14) defects cm(-3)) of paramagnetic hole centers and modifies the photoluminescence properties of the sample: the emission amplitude decreases and three contributions can be singled out at about 3.3, 3.8 and 4.4 eV.
ANEDDA A, CARBONARO CM, CORPINO R, AGNELLO S (2005). Photoluminescent and paramagnetic centers in gamma irradiated porous silica. JOURNAL OF NON-CRYSTALLINE SOLIDS, 351(21-23), 1784-1786 [10.1016/j.jnoncrysol.2005.04.015].
Photoluminescent and paramagnetic centers in gamma irradiated porous silica
AGNELLO, Simonpietro
2005-01-01
Abstract
he photolummescence and electron spin resonance properties of gamma irradiated (up to 500 kGy) porous silica are reported. By exciting at 5.6 eV a photoluminescence contribution can be detected before irradiation, peaked at about 4.1 eV. Gamma irradiation causes the generation of the E' centers (about 1 x 10(14) defects cm(-3)) of paramagnetic hole centers and modifies the photoluminescence properties of the sample: the emission amplitude decreases and three contributions can be singled out at about 3.3, 3.8 and 4.4 eV.
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