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Origins of Light Emission and Efficiency Saturation of the Photoluminescence of GaN Nanocrystallites

Published online by Cambridge University Press:  01 February 2011

Xiang-Bai Chen ,
John L. Morrison ,
Margaret K. Penner ,
Jennifer Elle ,
Leah Bergman  and
Andrew P. Purdy
Xiang-Bai Chen
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83844–0903
John L. Morrison
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83844–0903
Margaret K. Penner
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83844–0903
Jennifer Elle
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83844–0903
Leah Bergman
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83844–0903
Andrew P. Purdy
Affiliation:
US Naval Research Laboratory, Chemistry Division, Washington DC 20375
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Abstract

The photoluminescence (PL) properties of GaN nanorods were studied utilizing UV micro-photoluminescence. The room temperature PL of the GaN nanorods exhibits one strong emission line. The PL intensity as a function of the laser power was investigated in order to determine whether this emission originates from an excitonic or a bandgap recombination process. Our analysis indicates that the PL of the rods is excitonic-like and very similar to the behavior of the free exciton A in GaN thin films. However, for a relatively large and compact ensemble of rods, the PL intensity exhibits a significant saturation occurring already at relatively low laser power. We attribute the intensity saturation to the laser heating and heat trapping which takes place in the enclosure of the ensemble.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 798: Symposium Y – GaN and Related Alloys , 2003 , Y5.73
Copyright
Copyright © Materials Research Society 2004

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References

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