Effect of pressure on luminescence properties of Sm3+ ions in potassium niobate tellurite glass |
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| Authors: | C.K. Jayasankar K. Upendra Kumar V. Venkatramu P. Babu Th. Tröster W. Sievers G. Wortmann |
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| Affiliation: | 1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;2. Department of Physics, Yogi Vemana University, Kadapa 516003, India;3. Department of Physics, Government Degree College, Wanaparthy 509103, India;4. Fakultät für Maschinenbau, Lehrstuhl für Leichtbau im Automobil, Universität Paderborn, D-33098 Paderborn, Germany;5. Department of Physics, University of Paderborn, D-33095 Paderborn, Germany;1. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain;2. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, 28049 Madrid, Spain;3. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain |
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| Abstract: | Emission spectra and decay properties of the 4G5/2 level of Sm3+ ions in TeO2+K2O+Nb2O5 glass have been measured as a function of pressure upto 14.6 GPa at room temperature. A progressive red shift in the barycentres of 4G5/2→6HJ (J=9/2, 7/2 and 5/2) emission bands and increase in splitting of these bands have been observed with increasing pressure. The luminescence decay profile of the 4G5/2 level at ambient condition shows a nearly single exponential nature and with increase in pressure it becomes gradually non-exponential associated with a decrease in lifetime. The non-exponential decay curves are well-fitted to the Inokuti–Hirayama model for S=6, indicating that the interaction for cross-relaxation energy transfer between Sm3+ ions is of dipole–dipole type. The results obtained after release of pressure reveal that there is a small hysteresis. |
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