Università degli Studi di Cagliari
Photoluminescent and paramagnetic centers in gamma irradiated porous silica
CARBONARO, CARLO MARIA;CORPINO, RICCARDO;
2005-01-01
Abstract
The 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. (c) 2005 Elsevier B.V. All rights reserved.
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