期刊
JOURNAL OF APPLIED PHYSICS
卷 110, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3653272
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资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Instituto Nacional de Nanotecnologia para Marcadores Integrados (INAMI) (Brazil)
Energy transfer processes in Yb3+-Tb3+ co-doped, low-silica calcium aluminosilicate glasses were analyzed. Luminescence and time-resolved measurements were used to study upconversion processes, such as Yb-Tb cooperative sensitization, Yb-Yb cooperative luminescence, and Yb-Tb cross relaxation. The quantum cross relaxation efficiency was evaluated as a function on the Yb3+ concentration, and the maximum estimated value was approximately 51%. In addition, the intensity of the upconversion luminescence from the Tb3+:D-5(4) level decreased by two orders of magnitude comparing the value at room temperature with that at 123 K. As a consequence, Yb-Yb cooperative luminescence around 500 nm became comparable with the intensity of upconversion from the Tb3+:D-5(4) level. Furthermore, a dependence of the upconversion kinetics luminescence on temperature was observed. The upconversion rise time was constant and equal to 65 mu s for temperatures between 296 to 473 K and decreased from 65 to 19 mu s, without variation in the decay part, when the temperature was lowered from 296 to 123 K. These results were explained by a phonon-assisted cooperative sensitization process for the population of the Tb3+:D-5(4) level. (C) 2011 American Institute of Physics. [doi:10.1063/1.3653272]
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