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RESEARCH PRODUCT

Photoluminescent and paramagnetic centers in gamma irradiated porous silica

Alberto AneddaCarlo Maria CarbonaroSimonpietro AgnelloRiccardo Corpino

subject

PhotoluminescenceChemistrySilicaCondensed Matter PhysicsPhotochemistryElectronic Optical and Magnetic Materialslaw.inventionParamagnetismNuclear magnetic resonancelawMaterials ChemistryCeramics and CompositesIrradiationmesoporous silicaElectron paramagnetic resonancePorosityPorous mediumPhotoluminescenceGamma irradiation

description

Abstract The photoluminescence 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 × 1014 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.

yearjournalcountryeditionlanguage
2005-07-01
10.1016/j.jnoncrysol.2005.04.015http://hdl.handle.net/10447/32075