de Assumpcao, Thiago A. A.da Silva, Davinson M.Camilo, Mauricio E. [UNESP]Kassab, Luciana R. P. [UNESP]Anderson, S.de Araujo, Cid B.Wetter, Niklaus U.2014-05-202014-05-202012-09-25Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 536, p. S504-S506, 2012.0925-8388http://hdl.handle.net/11449/41129Frequency 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.S504-S506engNanostructured materialsRare-earth compoundsOptical propertiesLuminescenceLocalized surface plasmonsFrequency upconversionArtigo10.1016/j.jallcom.2011.12.078WOS:000310837500110Acesso restrito