Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 781, Issue -, Pages 1119-1126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.12.038
Keywords
Tellurite glass; Cooperative energy transfer; Thermal lens effect; Down-conversion; Yb3+ ions; Te4+ ions
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparoa Pesquisa do Estado de Sao Paulo (FAPESP) [2013/19747-9]
- Fundacao de Apoio ao Desenvolvimento do Ensino, Ciencia e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT) [59/300.031/2015, 23/200.735/2014]
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Te4+/Yb3+ co-doped 80%TeO2-20%Li2O glasses (amounts in mol%) were prepared by the conventional melt-quenching method in an ambient atmosphere, in order to investigate their optical characteristics for application in solar cells. An efficient near-infrared down-conversion mechanism was observed in these samples, involving the emission of two near infrared photons (at around 978 nm) after the absorption of one photon in the ultraviolet-blue region. This effect occurred by means of a process of cooperative energy transfer (CET) from Te4+ to Yb3+ ions. The CET efficiency (eta(CET)) was calculated from radiative transitions (lifetime) and also by a new method, developed in this work, based on rate equations quantifying the non-radiative transitions (thermal effect) involved in the system. The two methods showed very good agreement, with eta(CET) between 82 and 100% obtained for the sample prepared using a higher Yb3+ concentration (4 mol%). The results suggested that these tellurite materials could have potential applications in improving the efficiency of silicon-based solar cells. (C) 2018 Elsevier B.V. All rights reserved.
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