Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244225
Type: Artigo
Title: Study of multicomponent fluoro-phosphate based glasses: Ho3+ as a luminescence center
Author: Babu, S.
Seshadri, M.
Balakrishna, A.
Prasad, V. R.
Ratnakaram, Y. C.
Abstract: The multicomponent 49.5P(2)O(5)-10AlF(3)-10BaF(2)-10SrF(2)-10PbO-10M (M=Li2O, Na2O, K2O, ZnO and Bi2O3) glasses doped with 0.5 mol% holmium were prepared by melt quenching technique. Their thermal behavior was examined from differential scanning calorimetry (DSC). It is found that bismuth fluorophosphate glass matrix has good thermal stability. Their structures were characterized by the X-ray diffraction with SEM analysis, fourier transform infrared (FTIR), Raman spectroscopy and magic angle spinning (MAS) nuclear magnetic resonance (NMR) techniques. It was found that the phosphate network of these glasses was composed mainly of Q(2) and Q(3) phosphate tetrahedral units. The Judd-Ofelt parameters (J-O) (Omega(2), Omega(4) and Omega(6)) were evaluated from the intensities of the energy levels through optical absorption spectra. The most intense transitions are observed in the visible region of the spectrum. It is observed that the transition I-5(8) -> (5)G(6) is the hypersensitive transition for Ho3+ ion. With these J-O parameters, various radiative properties like the probabilities of radiative transitions, radiative lifetimes and branching ratios have been calculated for different fluoro-phosphate glasses. The luminescence kinetics from excited holmium levels have been studied upon selective excitation through photoluminescence measurements. Holmium produces two visible laser emissions i.e. one is green (F-5(4)(S-5(2)) -> I-5(8)) and another one is red (F-5(5) -> I-5(8)). The lifetimes of these levels have been experimentally determined through decay profile studies. The above results suggest that the prepared bismuth fluorophosphate glass system could be a suitable candidate for using it as a green laser source (F-5(4)(S-5(2)) -> I-5(8)) in the visible region of the spectrum.
Subject: Hólmio
Espectroscopia Raman
Luminescência
Country: Holanda
Editor: Elsevier
Citation: Study Of Multicomponent Fluoro-phosphate Based Glasses: Ho3+ As A Luminescence Center. Elsevier Science Bv, v. 479, p. 26-34 DEC-2015.
Rights: fechado
Identifier DOI: 10.1016/j.physb.2015.09.023
Address: https://www.sciencedirect.com/science/article/pii/S0921452615302362
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000364166500005.pdf1.67 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.