Role of diffusing molecular hydrogen on relaxation processes in Ge-doped glass

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 10K to 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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https://hal-ujm.archives-ouvertes.fr/ujm-00136417
Contributor : Youcef Ouerdane <>
Submitted on : Tuesday, March 13, 2007 - 6:57:39 PM
Last modification on : Wednesday, July 25, 2018 - 2:05:30 PM

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K. Medjahdi, Aziz Boukenter, Y. Ouerdane, Fabrizio Messina, Marco Cannas. Role of diffusing molecular hydrogen on relaxation processes in Ge-doped glass. Journal of Non-Crystalline Solids, Elsevier, 2007, 353 (5-7), pp.447-450. ⟨10.1016/j.jnoncrysol.2006.10.012⟩. ⟨ujm-00136417⟩

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