Title: Luminescence of Sm-doped CaMoO₄ phosphors prepared by sol-gel process

Authors: H-Y. He

Addresses: College of Material Science and Engineering, Shaanxi University of Science and Technology, 710021, China

Abstract: This work studies the effect of calcination temperature on the photoluminescene property of the Sm-doped CoMoO₄ to develop new white phosphors for the application in white light emitting diodes (LEDs) by controlling preparation temperature. The Sm-doped CaMoO₄ (5 at% Sm³⁺) phosphors were fabricated by the sol-gel process. Experiment results indicated that the matrices of the phosphors and Sm cation in the phosphors show blue-green and red emissions, respectively, and their intensities changed inversely with the calcination temperature. The CIE chromaticity coordinate calculation further revealed that the visible luminescence of the phosphors obviously changes with calcination temperature, and the phosphors synthesised at calcination temperature of 600°C show white emission. The luminescence variation of the phosphors with calcination temperature was discussed on the basis of microstructural characterisations of the phosphors.

Keywords: optical materials; chemical synthesis; preparation temperature; luminescence; white phosphors; material properties; microstructure; sol-gel process; calcination temperature; cobalt molybdate; CoMoO4; white LEDs; light emitting diodes.

DOI: 10.1504/IJMMP.2014.067316

International Journal of Microstructure and Materials Properties, 2014 Vol.9 No.6, pp.516 - 524

Received: 12 Mar 2014
Accepted: 14 Oct 2014
Published online: 04 Feb 2015 *

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