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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Concentration effect on the spectroscopic behavior of Tb3+ ions in zinc phosphate glasses

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Author(s):
Kesavulu, C. R. [1] ; Almeida Silva, Anielle Christine [2] ; Dousti, M. R. [1] ; Dantas, Noelio Oliveira [2] ; de Camargo, A. S. S. [1] ; Catunda, Tomaz [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil
[2] Univ Fed Uberlandia, Inst Fis, Lab Novas Mat Isolantes & Semicond, Uberlandia, MG - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Luminescence; v. 165, p. 77-84, SEP 2015.
Web of Science Citations: 35
Abstract

Zinc phosphate glasses (PZABPTb) in the compositional system: P2O5-ZnO-Al2O3-BaO-PbO doped with variable Tb3+ concentrations (1-5 wt% Tb2O3) were prepared and characterized through absorption, excitation, emission and intensity decay rate measurements. The Judd-Ofelt model has been adopted to evaluate the radiative properties of the D-5(4)-->F-7(6-3) emission transitions. The effect of Tb3+ ion concentration on the emissions from the D-5(3,4) excited levels is discussed in detail. Analysis of the intensity decay curves corresponding to blue and green emissions from levels D-5(3) and D-5(4), respectively, allowed determination of effective lifetimes, which confirmed the Tb3+ ion concentration quenching of the blue emission in these glasses. The decay curves for the D-5(3) level are found to be non-exponential in nature for all the studied concentrations due to ion-ion energy transfer through cross-relaxation. In an attempt to identify the origin of the energy transfer mechanism, the decay curves were well fitted to the Inokuti-Hirayama model for S=6, which indicates that the energy transfer process is of dipole-dipole type. The optical band gap energy (E-opt) has been evaluated taking into account the ultraviolet edge of absorption spectra. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/19338-9 - Nonlinear N2 spectroscopy in ion doped solids
Grantee:Kesavulu Culala Rajasekharaudayar
Support type: Scholarships in Brazil - Post-Doctorate