Gouveia-Neto, A. S.da Costa, E. B.Bueno, L. A.Messaddeq, Younes [UNESP]Ribeiro, SJL2014-05-202014-05-202005-05-17Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 394, n. 1-2, p. 24-27, 2005.0925-8388http://hdl.handle.net/11449/36563Visible frequency upconversion emission through resonant energy-transfer involving neodymium and praseodymium ions in PbGeO3-PbF2-CdF2 glass excited by a semiconductor laser at 8 10 nm is investigated. Luminescence emission centered around 485, 530, 610, and 645 nm, which correspond to the P-3(0) -> H-3(4), P-3(1) + I-1(6) -> H-3(5), P-3(0) -> H-3(6) and P-1(0) -> F-3(2) transitions of praseodymium ions, respectively, are observed. The upconversion excitation of the Pr3+ ions excited-state emitting levels was accomplished by means of an ion-pair interaction involving ground-state absorption, multiphonon relaxation, and excited-state absorption of pump photons at 8 10 nm by the Nd3+ (I-4(9/2) -> H-2(9/2), F-4(5/2); F-4(3/2) -> P-2(1/2)) and direct energy-transfer to Pr3+ ((4)G(11/2) + K-2(11/2), H-3(4) -> I-4(9/2), P-3(1) + I-1(6)). The dependence of the upconversion emission intensity upon the excitation power, and neodymium concentration are also examined. (c) 2004 Elsevier B.V. All rights reserved.24-27engenergy-transferupconversionglassrare-earthluminescenceArtigo10.1016/j.jallcom.2004.10.030WOS:000229159300009Acesso restrito29985038419178156446047463034654