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Optimization of Cerium Doped Garnets Using Combinatorial Chemistry for Application as Luminescent Conversion Phosphors in White LEDs

Published online by Cambridge University Press:  10 February 2011

Jennifer L. Wu ,
Martin Devenney ,
Earl Danielson ,
Damadora Poojary  and
Henry Weinberg
Jennifer L. Wu
Affiliation:
Department of Chemical Engineering, University of California at Santa Barbara, CA 93106
Martin Devenney
Affiliation:
Symyx Technologies, 3100 Central Expressway, Santa Clara, CA, 95051
Earl Danielson
Affiliation:
Symyx Technologies, 3100 Central Expressway, Santa Clara, CA, 95051
Damadora Poojary
Affiliation:
Symyx Technologies, 3100 Central Expressway, Santa Clara, CA, 95051
Henry Weinberg
Affiliation:
Symyx Technologies, 3100 Central Expressway, Santa Clara, CA, 95051
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Abstract

An area of considerable research interest is the development of visible light, down- conversion phosphors for application in white light emitting diodes (LEDs). In such devices, a blue LED can act as the primary light source, exciting photoluminescence in a phosphor with subsequent broad band emission occurring at visible wavelengths of lower energy. A combinatorial approach to synthesize and screen potential inorganic phosphors for such an application has been developed. Using solution chemistry techniques, solid state thin film arrays of (Y1−xGdx)3-z(Al1−yGay)5O12:Ce3+Z, where x and y range from 0 to 1.0 and z is equal to 0.03 were synthesized. Subsequent characterization demonstrates that the combinatorial approach can be used to rapidly screen potential phosphors for use as luminescence down-converters in white LEDs. Emission and excitation trends match those reported in the literature for traditionally prepared powder samples. The optimal Ce3+ concentration in Y3Al5O12 (YAG) was identified as approximately 1.5 mol%, and within the YAG-substituted host specific compositions were identified as promising blue to yellow phosphor candidates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 560: Symposium E – Luminescent Materials , 1999 , 65
Copyright
Copyright © Materials Research Society 1999

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References

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