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Erschienen in:
1988 | OriginalPaper | Buchkapitel
Self-Trapped Excitons in Amorphous and Crystalline SiO2
verfasst von : Noriaki Itoh, Katsumi Tanimura, Chihiro Itoh
Erschienen in: The Physics and Technology of Amorphous SiO2
Verlag: Springer US
Enthalten in: Professional Book Archive
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Properties of the self-trapped excitons in amorphous and crystalline SiO2 studied through transient volume and optical absorption change and luminescence are compared. It is emphasized that local lattice relaxation induced upon electronic excitation in crystalline and amorphous materials is similar except that the time decay of the self-trapped excitons in the amorphous is non-exponential. Based on the fact that the self-trapped exciton in crystalline SiO2 is a close vacancy-interstitial pair, we propose a new mechanism for the luminescence in amorphous SiO2 exhibiting a non-exponential time decay.