Effect of Temperature on Upconversion Luminescence in Yb3+/Tb3+ Co-Doped Germanate Glass |
| M. Kochanowicz, D. Dorosz, J. Zmojda, P. Miluski and J. Dorosz
Department of Optoelectronics and Lighting Technology, Faculty of Electrical Engineering, Białystok University of Technology, Wiejska 45D, 15-351 Białystok, Poland |
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| In the article effect of temperature on the cooperative energy transfer in germanate glass co-doped with Yb3+/Tb3+ under 976 nm laser diode pumping was investigated. The optimization of Tb3+ concentration on the upconversion: luminescence was determined. Strong luminescence at 489, 543, 586, 621 nm corresponding to 5D4 → 7FJ (J = 6, 4, 3) transitions and luminescence at 381, 415, 435 nm resulting from 5D3, 5G6 → 7FJ (J=6, 5, 4) transitions were presented. The highest upconversion emission intensity was obtained in glass co-doped with 0.7 Yb2O3/0.7Tb2O3 (mol%). The effect of temperature on the luminescent properties of germanate glass in the range of 5-250°C indicates the presence of competing phenomena: an increase in the effective absorption cross-section of Yb3+ ions donor as a function of temperature and migration of energy between pairs of ions Yb3+-Yb3+ and of multiphonon excitation levels 7FJ. |
DOI: 10.12693/APhysPolA.124.471 PACS numbers: 42.70.-a, 42.79.Ag, 42.81.-i |