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Eu+3 and Cr+3 doping for red cathodoluminescence in ZnGa2O4

Published online by Cambridge University Press:  31 January 2011

Philip D. Rack ,
Jeffrey J. Peterson ,
Michael D. Potter  and
Wounjhang Park
Philip D. Rack
Affiliation:
Department of Microelectronic Engineering, Rochester Institute of Technology, Rochester, New York 14623
Jeffrey J. Peterson
Affiliation:
Advanced Vision Technologies, Inc, 150 Lucius Gordon Drive, Suite 215, West Henrietta, New York 14586
Michael D. Potter
Affiliation:
Advanced Vision Technologies, Inc, 150 Lucius Gordon Drive, Suite 215, West Henrietta, New York 14586
Wounjhang Park
Affiliation:
Georgia Tech Research Institute, Atlanta, Georgia 30332
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Abstract

Cathodoluminescence emission spectra and photoluminescence (PL) excitation spectra were used to evaluate Eu+3 and Cr+3 as activators for red luminescence in ZnGa2O4. In the ZnGa2O4:Eu materials red emission from Eu+3 and blue intrinsic emission were observed. The blue intrinsic emission increased relative the Eu+3 emission with increasing current density and is attributed to preferential current saturation of the Eu+3 activators. In addition, PL excitation measurements revealed that the inefficient energy transfer from the ZnGa2O4 host to the Eu+3 is due to poor spectral overlap between the ZnGa2O4 emission and the Eu+3 absorption. Cr-doping resulted in a saturated red-color, and no host emission was observed over the entire current density regime investigated. The PL excitation of the ZnGa2O4:Cr revealed good overlap between the ZnGa2O4 host and the Cr+3 absorption. Efficient energy transfer to the Cr+3 activators occurs via multipolar interactions.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1429 - 1433
Copyright
Copyright © Materials Research Society 2001

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References

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