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Journal of Physical Studies 20(3), Article 3401 [4 pages] (2016)
DOI: https://doi.org/10.30970/jps.20.3401 TEMPERATURE INFLUENCE ON THE OPTICAL PROPERTIES OF ERBIUM-DOPED Ag0.05Ga0.05Ge0.95S2 GLASSESV. V. Halyan, A. H. Kevshyn, M. V. Shevchuk, S. A. Fedosov, P. P. Shygorin
Lesya Ukrainka Eastern European National University |
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Studied in this article has been the optical absorption spectra of chalcogenide glasses based on Ag$_{0.05}$Ga$_{0.05}$Ge$_{0.95}$S$_2$, which include 0.12, 0.16, 0.27 at.\0.000000E+000r at the temperature of 80 K. We have registered the absorption bands with the maxima at 490, 520, 660, 805 and 980 nm that correspond to the transitions between ground state $^4$I$_{15/2}$ and $^4$F$_{7/2}$, $^2$H$_{11/2}$, $^4$F$_{9/2}$, $^4$I$_{9/2}$, $^4$I$_{11/2}$ levels in the erbium ion, respectively. For our samples we have established that the energy band-gap will increase when temperature decreases. At a low temperature, the change of band-gap is 0.15-0.20 eV in comparison with the room temperature case. In this case samples were irradiated by laser at a wavelength of 532 nm in a visible and near infrared region. We also investigated the temperature dependence of radiation peaks with the wavelength of 660, 860, 980 nm in the temperature range of 80-300 K. Our theoretical explanation of the emission spectra is based on the energy level structure in the erbium ions. The activation dependence of the emission intensity change for 860 nm peak was obtained. Presented here are the experimental curves for a dependence of the intensity of photoluminescence on temperature.
PACS number(s): 42.70.Ce, 42.70.M,N, 77.84.Bw, 78.66.Jg