On the efficient Te4+-> Yb3+ cooperative energy transfer mechanism in tellurite glasses: A potential material for luminescent solar concentrators

Autor(es)

Rufino Souza, Ana Kely ^[1] ; Langaro, Ana Paula ^[1] ; Silva, Junior Reis ^[1] ; Costa, Francine Bettio ^[2] ; Yukimitu, Keizo ^[2] ; Silos Moraes, Joao Carlos ^[2] ; de Oliveira Nunes, Luiz Antonio ^[3] ; da Cunha Andrade, Luis Humberto ^[1] ; Lima, Sandro Marcio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Mato Grosso Sul, Grp Espect Opt & Fototerm, 351, BR-79804970 Dourados, MS - Brazil

^[2] UNESP, Fac Engn Ilha Solteira, Grp Vidros & Ceram, BR-15385000 Ilha Solteira, SP - Brazil

^[3] Univ Sao Paulo, Lab Laser & Aplicac, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 781, p. 1119-1126, APR 15 2019.
• Citações Web of Science: 4

Resumo

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. (AU)

• Processo FAPESP: 13/19747-9 - Investigação de propriedades espectroscópicas em vidros telúritos livres de OH-
• Beneficiário: João Carlos Silos Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular