Evidence from photoluminescence studies for a low-energy absorption tail in chalcogenide glasses and crystals
- 1 August 1975
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 32 (2) , 431-439
- https://doi.org/10.1080/14786437508219966
Abstract
The photoluminescence excitation spectra in some arsenic chalcogenide semiconductors have been explored to low energies, from which absorption coefficients down to 10−1 cm−1 can be derived. New evidence is presented for a weak absorption tail in both crystals and glasses, and the data are discussed in terms of an optical transition involving a localized defect state. It is shown that the data support a recent model in which the photoluminescence recombination centre is a shallow state that has a strong electron-phonon coupling.Keywords
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