期刊
JOURNAL OF LUMINESCENCE
卷 157, 期 -, 页码 365-370出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2014.09.010
关键词
Tellurite glasses; Downconversion process; Energy transfer; Efficiency; Optical spectroscopy; Thermal lens spectroscopy
类别
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [140459/2011-1, 305063/2012-0, 307943/2012-7, 306970/2011-2, 306950/2011-1]
In this work we report the observed downconversion (DC) mechanism in Er3+/Yb3+-codoped tellurite glasses (in mol%, 80TeO(2)-10Li(2)O-10TiO(2)). The samples were synthesized by the conventional melt-quenching method and then studied using optical spectroscopy and thermal lens spectroscopy (TLS). These characterizations enabled investigation of the radiative and nonradiative processes involved in energy transfer from erbium to ytterbium. The visible Er3+ fluorescence intensities decreased as a function of the Yb3+ concentration, and there was a corresponding increase in the ytterbium emission at around 980 nm. Simultaneously, there was a reduction in the heat-generated due nonradiative decays (similar to 21%) when ytterbium was added. This temperature change was measured by TLS measurements and the results corroborate with the indicated by spectroscopic interpretation. (C) 2014 Elsevier B.V. All rights reserved.
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