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Spectral Properties of Various Cerium Doped Garnet Phosphors for Application in White GaN-based LEDs

Published online by Cambridge University Press:  18 March 2011

Jennifer L. Wu ,
Steven P. Denbaars ,
Vojislav Srdanov  and
Henry Weinberg
Jennifer L. Wu
Affiliation:
Department of Chemical Engineering
Steven P. Denbaars
Affiliation:
Department of Materials
Vojislav Srdanov
Affiliation:
Center for Polymers and Organic Solids, University of California, Santa Barbara Santa Barbara, CA, 93106
Henry Weinberg
Affiliation:
Symyx Technologies, 3100 Central Expressway Santa Clara, CA, 95051
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Abstract

Recently, a renewed research interest has emerged for the development of visible light, down-converting phosphors for application in white light emitting diodes (LEDs). In such devices, a blue GaN LED can act as the primary light source, exciting photoluminescence in a phosphor with subsequent broad-band emission occurring at lower energies. It was recently reported that use of a combinatorial approach to synthesize and screen potential inorganic phosphors for such an application could aid in identifying improved phosphors for blue to yellow down conversion. Using solution chemistry techniques developed by Symyx Technologies, solid state thin-film arrays (libraries) based on the garnet structure (A1-xBx)3(C1-yDy)5O12:Ce3+, where x and y = 0 to 1.0 and A, B = Y, Gd, or Lu; C., D = Al or Ga, were synthesized. X-ray diffraction was used to select library samples of the crystalline garnet phase. Libraries of these various garnets were then characterized, and their spectral properties compared to traditionally prepared bulk powder phosphors of similar composition. Emission and excitation trends show that as larger cations are substituted for Y (A = Y), emission and excitation are red-shifted and as larger cations are substituted for Al (C = Al), emission and excitation are blue-shifted. If smaller cations are substituted for Y and Al, an opposite trend is observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG11.8
Copyright
Copyright © Materials Research Society 2001

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References

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