dos Santos, P. V.Vermelho, MVDGouveia, E. A.de Araujo, M. T.Gouveia-Neto, A. S.Cassanjes, F. C.Ribeiro, SJLMessaddeq, Younes [UNESP]2014-05-202014-05-202002-10-07Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 344, n. 1-2, p. 304-307, 2002.0925-8388http://hdl.handle.net/11449/33620Upconversion luminescence and thermal effects in Pr3+/Yb3+- and Er3+/Yb3+-codoped 60TeO(2)-10GeO(2)-10K(2)O-10Li(2)O-10Nb(2)O(5) tellurite glasses excited by CW infrared radiation at 1.064 mum is reported. Generation of intense green and red fluorescence emission in Er3+/Yb3+-codoped samples and appreciable upconversion luminescence in the wavelength region of 450-680 nm in Pr3+/Yb3+-codoped samples is observed. Temperature-induced enhancement of X12 in the upconversion efficiency in Er3+/Yb3+- and X10 in the Pr3+/Yb3+-doped samples is demonstrated. (C) 2002 Elsevier B.V. B.V. All rights reserved.304-307engluminescencerare-earthglassthermal-effectupconversionArtigo10.1016/S0925-8388(02)00374-2WOS:000178852200067Acesso restrito64460474630346542998503841917815