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Particle Size Effects in YAG:CR Phosphors

Published online by Cambridge University Press:  21 February 2011

J. Mckityrick ,
B. Hoghooghi ,
W. Dubbelday ,
K. Kavanagh ,
K. Kinsman ,
L. Shea  and
E. Sluzky
J. Mckityrick
Affiliation:
University of California, San Diego, Materials Science Program, La Jolla, CA 92093-0411
B. Hoghooghi
Affiliation:
University of California, San Diego, Materials Science Program, La Jolla, CA 92093-0411
W. Dubbelday
Affiliation:
Naval Command Control and Ocean Surveillance Center, NRaD, San Diego, CA 92152-5000
K. Kavanagh
Affiliation:
University of California, San Diego, Materials Science Program, La Jolla, CA 92093-0411
K. Kinsman
Affiliation:
Raychem Corp., Menlo Park, CA 94025-1164
L. Shea
Affiliation:
University of California, San Diego, Materials Science Program, La Jolla, CA 92093-0411
E. Sluzky
Affiliation:
Hughes Aircraft Co., Carlsbad, CA 92008
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Abstract

Chromium doped yttrium aluminum garnet (Y3Al5O12:Cr or YAG:Cr) phosphors were synthesized by hydrolysis of aqueous nitrate solutions. The resulting as-synthesized powder was amorphous and crystallized into the YAG structure at ~1000°C. The light output as a function of annealing temperature was found to increase with increasing temperature. Particle size, adsorbed surface species or residual impurities, lattice stability and chromium site occupation were investigated as possible explanations. It was found that there was a small decrease in lattice parameter upon annealing, the particle size increased roughly five times, and residual or adsorbed surface species were present for the low temperature annealed powders. There was no evidence that kinetic barriers to diffusion of Cr ions into the luminescent sites occurred.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 348 , 1994 , 519
Copyright
Copyright © Materials Research Society 1994

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References

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