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

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]

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

• 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: 12/19338-9 - Nonlinear n2 spectroscopy in ion doped solids
• Grantee: Kesavulu Culala Rajasekharaudayar
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC