Document Type
Article
Original Publication Date
2014
Journal/Book/Conference Title
Physical Review B
Volume
90
DOI of Original Publication
10.1103/PhysRevB.90.235203
Date of Submission
April 2015
Abstract
In high-purity GaN grown by hydride vapor phase epitaxy, the commonly observed yellow luminescence (YL) band gives way to a green luminescence (GL) band at high excitation intensity. We propose that the GL band with a maximum at 2.4 eV is caused by transitions of electrons from the conduction band to the 0/+ level of the isolated CN defect. The YL band, related to transitions via the −/0 level of the same defect, has a maximum at 2.1 eV and can be observed only for some high-purity samples. However, in less pure GaN samples, where no GL band is observed, another YL band with a maximum at 2.2 eV dominates the photoluminescence spectrum. The latter is attributed to the CNON complex.
Rights
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Is Part Of
VCU Physics Publications
Comments
Originally published by the American Physical Society at http://dx.doi.org/10.1103/PhysRevB.90.235203