Otro
Frequency upconversion properties of Tm3+ doped TeO2-ZnO glasses containing silver nanoparticles
Registro en:
Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 536, p. S504-S506, 2012.
0925-8388
10.1016/j.jallcom.2011.12.078
WOS:000310837500110
Autor
de Assumpcao, Thiago A. A.
da Silva, Davinson M.
Camilo, Mauricio E.
Kassab, Luciana R. P.
Gomes, Anderson S. L.
de Araujo, Cid B.
Wetter, Niklaus U.
Resumen
Frequency upconversion (UC) properties of Tm3+ doped TeO2-ZnO glasses containing silver nanoparticles (NPs) were investigated. Infrared-to-visible and infrared-to-infrared UC processes associated to the Tm3+ ions were studied by exciting the samples with a cw 1050 nm ytterbium laser. The luminescence intensity as a function of laser intensity was also measured using a pulsed 1047 nm Nd3+:YVO laser in order to determine the number of photons participating in the UC processes. Enhancement of the UC signals for samples heat-treated during various time intervals is attributed to the growth of the local field in the vicinity of the NPs. PL enhancement by one-order of magnitude was observed in the whole spectrum of the samples heat-treated during 48 h. on the other hand PL quenching was observed for the samples heat-treated more than 48 h. (c) 2011 Elsevier B.V. All rights reserved. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)