The emission features of Ge-oxygen deficient centers in a 100 nm thick Ge-doped silica films were investigated by looking at the photoluminescence spectra and time decay under synchrotron radiation excitation in the 10–300 K temperature range. These centers exhibit two luminescence bands centered at 4.3 eV and 3.2 eV associated with the de-excitation from singlet (S1) and triplet (T1) states, respectively, that are linked by an intersystem crossing process. The comparison with results obtained in a bulk Ge-doped silica sample shows that the efficiency of the intersystem crossing process depends on the properties of the matrix embedding the Ge-oxygen deficient centers, being more effective in the film than in the bulk counterpart.

MESSINA F, AGNELLO S, BOSCAINO R, CANNAS M, GRANDI S, QUARTARONE E (2007). Optical properties of Ge-oxygen deficient centers embedded in silica films. JOURNAL OF NON-CRYSTALLINE SOLIDS, 353, 670-673 [10.1016/J.JNONCRYSOL.2006.10.033].

Optical properties of Ge-oxygen deficient centers embedded in silica films

MESSINA, Fabrizio;AGNELLO, Simonpietro;BOSCAINO, Roberto;CANNAS, Marco;
2007-01-01

Abstract

The emission features of Ge-oxygen deficient centers in a 100 nm thick Ge-doped silica films were investigated by looking at the photoluminescence spectra and time decay under synchrotron radiation excitation in the 10–300 K temperature range. These centers exhibit two luminescence bands centered at 4.3 eV and 3.2 eV associated with the de-excitation from singlet (S1) and triplet (T1) states, respectively, that are linked by an intersystem crossing process. The comparison with results obtained in a bulk Ge-doped silica sample shows that the efficiency of the intersystem crossing process depends on the properties of the matrix embedding the Ge-oxygen deficient centers, being more effective in the film than in the bulk counterpart.
2007
MESSINA F, AGNELLO S, BOSCAINO R, CANNAS M, GRANDI S, QUARTARONE E (2007). Optical properties of Ge-oxygen deficient centers embedded in silica films. JOURNAL OF NON-CRYSTALLINE SOLIDS, 353, 670-673 [10.1016/J.JNONCRYSOL.2006.10.033].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/17542
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