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Synthesis and characterization of cerium doped yttriumgadolinium aluminate phosphors by wet-chemical synthesis route

E. J. POPOVICI1,* , M. MORAR2, E.BICA1, I.PERHAITA1, A.I.CADIS1, E. INDREA3, L.BARBU-TUDORAN4

Affiliation

  1. Raluca Ripan Institute for Research in Chemistry, Babes-Bolyai University Cluj-Napoca, 400294 Cluj-Napoca, Romania
  2. Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
  3. National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania
  4. Electronic Microscopy Centre, Babes-Bolyai University Cluj-Napoca, 400006 Cluj-Napoca, Romania

Abstract

Synthesis of cerium activated yttrium gadolinium aluminate phosphors (Y,Gd)3Al5O12:Ce using the wet-chemical synthesis route via the reagent simultaneous addition technique (WCS-SimAdd) is reported for the first time. Y-Gd-Ce-Al precursors with variable Y:Gd ratios have been precipitated from metal nitrates and urea solutions that were simultaneously added, in an aqueous medium with controlled pH and temperature. The precursor nanopowders were intimately mixed with NH4Cl (flux) and calcined for 2 hrs at 1200C, in nitrogen flow and converted into micro-powders of phosphor with nominal formula Y2.97-xGdx Ce0.03 Al5O12 (where x=0; 0.75; 1.50; 2.25; 2.97). Chemical composition and thermal behaviour of precursors as well as the PL properties, and morphological and structural characteristics of phosphor powders were investigated in relation with the Gd amount. WCS-SimAdd route enables a good control of the synthesis conditions to prepare (Y,Gd)3Al5O12: Ce3+ phosphors with cubic/garnet crystalline structure, regular particle dimensions and shapes and intense yellow-to-orange emission appropriate for use in LED type optoelectronic devices..

Keywords

Phosphors; Chemical synthesis; Luminescence; X-ray diffraction; Scanning electron microscopy.

Submitted at: May 5, 2011
Accepted at: June 9, 2011

Citation

E. J. POPOVICI, M. MORAR, E.BICA, I.PERHAITA, A.I.CADIS, E. INDREA, L.BARBU-TUDORAN, Synthesis and characterization of cerium doped yttriumgadolinium aluminate phosphors by wet-chemical synthesis route, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 6, pp. 617-624 (2011)