A1 Refereed original research article in a scientific journal

Low temperature synthesis and optical properties of the R2O3:Eu3+ nanophosphors (R3+: Y, Gd and Lu) using TMA complexes as precursors




AuthorsI. G. N. Silva, L. C. V. Rodrigues, E. R. Souza, J. Kai, M. C. F. C. Felinto, J. Hölsä, H. F. Brito, O. L. Malta

PublisherELSEVIER SCIENCE BV

Publication year2015

JournalOptical Materials

Journal name in sourceOPTICAL MATERIALS

Journal acronymOPT MATER

Volume40

First page 41

Last page48

Number of pages8

ISSN0925-3467

DOIhttps://doi.org/10.1016/j.optmat.2014.11.044(external)


Abstract

The R2O3:Eu3+ (R3+: Y, Gd and Lu) nanophosphors were synthesized with a low temperature thermolysis method using rare earth 1,3,5-benzenetricarboxylate (TMA) complexes as precursors. The R(TMA):Eu3+ (1 mole %) complexes were synthesized using the co-precipitation method which complexes were then annealed at temperatures from 500 to 1000 degrees C for 1 h, yielding the cubic C-type R2O3:Eu3+ materials. The XPD patterns revealed no impurities in C-R2O3 obtained at any temperature. The Scherrer's equation based on powder diffraction data confirmed an increase in crystallite size from 6 to 52 nm with increasing annealing temperature from 500 to 1000 degrees C for Y2O3, respectively, agreeing with the SEM and TEM data. Similar results were obtained for the other R2O3:Eu3+. The excitation spectra show a broad oxide to europium charge transfer absorption band at 260 nm, i.e. O2-(2p) -> Eu3+(4f(6)) LMCT, as well as the narrow lines assigned to the 4f-4f transitions of the Eu3+ ion. The characterization of the photoluminescence properties of the phosphors was also based on the analysis of the emission spectra and luminescence decay curves. The experimental intensity parameters (Omega(lambda)), lifetimes (tau), as well as radiative (A(rad)) and non-radiative (A(nrad)) decay rates were calculated and discussed. (C) 2014 Elsevier B.V. All rights reserved.




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