Amorim, H. T.Vermelho, MVDGouveia-Neto, A. S.Cassanjes, F. C.Ribeiro, SJLMessaddeq, Younes [UNESP]2014-05-202014-05-202003-02-15Journal of Solid State Chemistry. San Diego: Academic Press Inc. Elsevier B.V., v. 171, n. 1-2, p. 278-281, 2003.0022-4596http://hdl.handle.net/11449/32644Red, green, and blue emission through frequency upconversion and energy-transfer processes in tellurite glasses doped with Tm3+ and Er3+ excited at 1.064 mum is investigated. The Tm3+/Er3+-codoped samples produced intense upconversion emission signals at around 480, 530, 550 and 660 nm. The 480 nm blue emission was originated from the (1)G(4)-->H-3(6) transition of the Tm3+ ions excited by a multiphoton stepwise phonon-assisted excited-state absorption process. The 5 30, 5 50 nm green and 660 mn red upconversion luminescences were identified as originating from the H-2(11/2), S-4(3/2) --> I-4(15/2) and F-4(9/2) --> I-4(15/2) transitions of the Er3+ ions, respectively, populated via efficient cross-relaxation processes and excited-state absorption. White light generation employing a single infrared excitation source is also examined. (C) 2003 Elsevier B.V. (USA). All rights reserved.278-281engvisiblefluorescenceupconversionrare earthglassenergy-transferwhite lightArtigo10.1016/S0022-4596(02)00176-7WOS:000183207400044Acesso restrito64460474630346542998503841917815