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.
MEDJAHDI K, BOUKENTER A, OUERDANE Y, MESSINA F, CANNAS M (2007). Role of diffusing molecular hydrogen on relaxation processes in Ge-doped glass. JOURNAL OF NON-CRYSTALLINE SOLIDS, 353, 447-450 [10.1016/j.jnoncrysol.2006.10.012].
Role of diffusing molecular hydrogen on relaxation processes in Ge-doped glass
MESSINA, Fabrizio;CANNAS, Marco
2007-01-01
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.
| File | Dimensione | Formato | |
|---|---|---|---|
|
1-s2.0-S0022309306013597-main.pdf
Solo gestori archvio
Dimensione
359.35 kB
Formato
Adobe PDF
|
359.35 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
