Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-25T15:28:08.402Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Hide, F., Kozodoy, P., Denbaars, S.P., Heeger, A.J., Appl. Phys. Letters, 70 (20), 2664–2666 (1997).Google Scholar
2. Schlotter, P., Schmidt, R., J. Schneider, Appl Phys. A, 64, 417–418 (1997).Google Scholar
3. Baur, J., Schlotter, P., Schneider, J., Festkoerprobleme, 37, 67–78 (1998).Google Scholar
4. Nakamura, S., in Light-Emitting Diodes: Research, Manufacturing, and Applications, (Proceedings of SPIE, Feb 13-14, 1997), p. 26.Google Scholar
5. Nakamura, S., Fasol, G., The Blue Laser Diode, (Springer, Berlin, 1997), pp. 216–219.Google Scholar
6. Holloway, W. W. Jr., J. Opt. Soc. Am., 59 (1), 60–63 (1969).Google Scholar
7. Tien, T. Y., Gibbons, E.F., DeLosh, R.G., Zacmanidis, P.J., Smith, D.E., Stadler, H. L, J Electrochem. Soc., 120 (2), 278–281 (1973).Google Scholar
8. Ropp, R.C., The Chemistry of Artificial Lighting Devices, (Elsevier Science Publishers, New York, 1993), pp. 502–504.Google Scholar