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Excitation‐energy‐dependent photoluminescence in glassy As–S and crystalline As 2 S 3
Author(s) -
Tanaka Keiji
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248519
Subject(s) - photoluminescence , luminescence , chalcogenide , excitation , photoluminescence excitation , materials science , crystal (programming language) , band gap , relaxation (psychology) , stoichiometry , chalcogenide glass , absorption (acoustics) , absorption spectroscopy , analytical chemistry (journal) , molecular physics , atomic physics , optics , optoelectronics , chemistry , physics , psychology , social psychology , chromatography , quantum mechanics , computer science , programming language , composite material
Photoluminescence in a chalcogenide glass system As–S and a related crystal As 2 S 3 (orpiment) has been studied with respect to excitation spectra, temperature dependence, and sample varieties. The crystal exhibits the strongest luminescence, and in the glass system, luminescence is the most intense at the stoichiometric composition As 2 S 3 . Luminescence characteristics in the As–S glasses are substantially different under excitation of bandgap and subgap light, which seem to be governed, respectively, by spatially extended electronic relaxation and direct excitation to the gap state that produces weak absorption tails.