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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 9
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 781, p. 1119-1126, APR 15 2019.
Web of Science Citations: 4
Abstract

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)

FAPESP's process: 13/19747-9 - Investigation of spectroscopic properties in OH- free tellurite glasses
Grantee:João Carlos Silos Moraes
Support Opportunities: Regular Research Grants