Time resolved photoluminescence associated with non-bridging oxygen hole centers in irradiated silica
| Autor: | Boscaino Roberto, Marco Cannas, Vaccaro Lavinia |
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| Přispěvatelé: | CANNAS M, VACCARO L, BOSCAINO R |
| Rok vydání: | 2008 |
| Předmět: |
Nuclear and High Energy Physics
Range (particle radiation) Photoluminescence Materials science Kinetics Analytical chemistry Defects Silica Radiation effects Laser Molecular physics Spectral line law.invention law Astrophysics::Earth and Planetary Astrophysics Irradiation Luminescence Instrumentation Excitation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:2945-2948 |
| ISSN: | 0168-583X |
| Popis: | We report time resolved photoluminescence spectra of irradiated silica under excitation with a laser tunable in the visible and UV range. The investigated samples exhibit the emission band at 1.9 eV associated with non-bridging oxygen hole centers, whose spectral and kinetics properties do not depend on the kind of irradiation (γ, β and neutrons). The 1.9 eV luminescence decay follows a multi-exponential curve with a characteristic lifetime that increases from 8.9 μs to 10.4 μs on increasing the emission energy. This dependence accounts for the blue-shift of the emission band during its decay and is interpreted as due to the inhomogeneous properties of silica leading to a distribution of kinetics features of this defect. |
| Databáze: | OpenAIRE |
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