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RESEARCH PRODUCT

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

K. MedjahdiYoucef OuerdaneFabrizio MessinaAziz BoukenterMarco Cannas

subject

PhotoluminescenceChemistryDopingRelaxation (NMR)Condensed Matter PhysicsPhotochemistryMolecular physicsElectronic Optical and Magnetic MaterialsHydrogen in glassOptical spectroscopyLuminescenceGermanatesSinglet fissionMaterials ChemistryCeramics and CompositesSinglet stateTriplet stateSpectroscopyExcitation

description

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.

yearjournalcountryeditionlanguage
2007-04-01Journal of Non-Crystalline Solids
https://doi.org/10.1016/j.jnoncrysol.2006.10.012