Role of diffusing molecular hydrogen on relaxation processes in Ge-doped glass |
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Institution: | 1. Laboratoire Traitement du Signal et Instrumentation, UMR CNRS 5516, Université J. Monnet, 18 rue Benoıˆt Lauras Bât. F, 42000 Saint-Etienne, France;2. Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, via Archirafi 36, I-90123 Palermo, Italy |
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Abstract: | Temperature dependencies of steady-state and time-resolved photoluminescence (PL) from triplet state at 3.1 eV and singlet state at 4.2 eV ascribed to the twofold-coordinated Ge have been measured in unloaded and H2-loaded Ge-doped silica samples under 5.0 eV excitation in the 10–310 K range. Experimental evidences indicate that diffusing molecular hydrogen (H2) depopulates by a collisional mechanism the triplet state, decreasing both its lifetime of about 14% and the associated triplet PL intensity, whereas those of the singlet are insensitive to the presence of H2. |
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