PHOTODARKENING ENERGY STATE IN NANOCRYSTALLINECdSxSe1−x-DOPED GLASS PROBED BY TIME-RESOLVED RAMAN SPECTROSCOPY

Xiaojie Zhang and Hiro-O Hamaguchi
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Xiaojie Zhang: Molecular Spectroscopy Laboratory, Kanagawa Academy of Science and Technology (KAST), KSP East 301, 3–2–1 Sakato, Kawasaki 218, Japan
Hiro-O Hamaguchi: Molecular Spectroscopy Laboratory, Kanagawa Academy of Science and Technology (KAST), KSP East 301, 3–2–1 Sakato, Kawasaki 218, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 1101-1104

Abstract: We studied the photodarkening effect in nanocrystallineCdSxSe1−x-doped glasses by pump-probe time-resolved Raman spectroscopy. A marked decrease in the phonon Raman intensities was observed when the photodarkened samples (commercial glass color filters) were pre-excited by the pump pulse. Such an intensity change was not observed for the fresh (unphotodarkened) samples. These findings have been interpreted in terms of a new photodarkening-induced state that traps the photoexcited electrons efficiently. The magnitude of the decrease in Raman intensities increased linearly with increasing selenium fraction, suggesting that the photodarkening energy state is related to the Se anion or corresponding vacancy on the surface ofCdSxSe1−xmicrocrystallites.

Date: 1996
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DOI: 10.1142/S0218625X96001960

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