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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1380 (August) (2010)  >  pp.758-761

Journal of the Ceramic Society of Japan
<<Previous article Vol.118  No.1380 (August) (2010)   pp.758 - 761 Next article>>

Preparation and fluorescence properties of novel alkaline earth silicate phosphors by reduction treatment of Eu3+ to Eu2+

Shinnosuke KAMEI1), Yoshiyuki KOJIMA1) and Nobuyuki NISHIMIYA1)
1) Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University

  The synthesis and emission spectrum control of novel Eu2+-activated amorphous alkaline earth silicate phosphors from the reduction of Eu3+-activated amorphous alkaline earth silicate phosphors is reported. The as-prepared Eu3+-activated amorphous alkaline earth silicate phosphors emitted red. Reduction using Ni-metal powder in a H2 (5%)/Ar (95%) atmosphere produced Eu2+-activated amorphous barium silicate phosphor that emitted green. Eu2+-activated amorphous calcium silicate was produced by reduction with ammonium chloride in air and emitted purple-blue. It was possible to control the emission spectrum by changing the reduction time. These results suggest the possibility to use three-band type phosphors for the fabrication of white light emitting diodes using one host crystal.


Keyword:
Amorphous phosphor, Alkaline earth silicate, Spectrum control, Reduction treatment, White-LED

Received: April 15, 2010
Accepted: June 17, 2010 , Published online: August 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan

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