Optical absorption, photoluminescence (PL), and electron paramagnetic resonance (EPR) data on unirradiated and UV-irradiated Ge-doped silica are reported. The analysis of the UV-induced effects shows the following facts: (i) both components of the 5-eV absorption band are partially bleached, as well as the PL excited within this absorption band; (ii) more consistent UV-induced changes arise at higher energies where bands at 5.8 and 6.4 eV grow during the treatment; (iii) Ge-E' and Si-E' EPR centers are UV generated, confirming their involvement in the photoconversion process but ruling out previous attribution of the 6.4 eV to Ge-E' centers; and (iv) the absorption band at 6.4 eV shows previously unobserved emission properties, probably due to excitation transfer processes

Crivelli, B., Martini, M., Meinardi, F., Paleari, A., Spinolo, G. (1996). Photoinduced conversion of optically active defects in germanium-doped silica. PHYSICAL REVIEW. B, CONDENSED MATTER, 54(23), 16637-16640 [10.1103/PhysRevB.54.16637].

Photoinduced conversion of optically active defects in germanium-doped silica

MARTINI, MARCO;MEINARDI, FRANCESCO;PALEARI, ALBERTO MARIA FELICE;SPINOLO, GIORGIO MARIO
1996

Abstract

Optical absorption, photoluminescence (PL), and electron paramagnetic resonance (EPR) data on unirradiated and UV-irradiated Ge-doped silica are reported. The analysis of the UV-induced effects shows the following facts: (i) both components of the 5-eV absorption band are partially bleached, as well as the PL excited within this absorption band; (ii) more consistent UV-induced changes arise at higher energies where bands at 5.8 and 6.4 eV grow during the treatment; (iii) Ge-E' and Si-E' EPR centers are UV generated, confirming their involvement in the photoconversion process but ruling out previous attribution of the 6.4 eV to Ge-E' centers; and (iv) the absorption band at 6.4 eV shows previously unobserved emission properties, probably due to excitation transfer processes
Articolo in rivista - Articolo scientifico
photoinduced conversion, defects, silica
English
16637
16640
4
Crivelli, B., Martini, M., Meinardi, F., Paleari, A., Spinolo, G. (1996). Photoinduced conversion of optically active defects in germanium-doped silica. PHYSICAL REVIEW. B, CONDENSED MATTER, 54(23), 16637-16640 [10.1103/PhysRevB.54.16637].
Crivelli, B; Martini, M; Meinardi, F; Paleari, A; Spinolo, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/31711
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