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Excitation Wavelength and Saturation Effects on Gallium Nitride Photoluminescence

Published online by Cambridge University Press:  21 February 2011

Mike Banas
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
Guangtian Liu
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
Jeff Ramer
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
Kang Zheng
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
Steve Hersee
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
Kevin Malloy
Affiliation:
Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87131.
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Abstract

We report on the excitation wavelength and power dependence of LPMOCVD grown GaN photoluminescence (PL). A mode-locked Ti:Sapphire laser that is doubled to provide a tunable wavelength range of 350-500 nm is used to pump the GaN samples. Special attention has been paid to the “yellow” (∼567 nm) luminescence. Different power dependence characteristics of the yellow emission are observed when pumping above and below the bandgap. A measurement of the photoluminescence excitation spectrum of the yellow peak (∼567 nm) is also performed and this spectrum shows a peak at room temperature at 3.36 eV (369 nm), an additional broad peak at 77 K and only the broad peak at 7 K. An excitation model is used to explain the behavior of the yellow emission, suggesting the neutral donor serves as a key species for the yellow emission.

Type
Research Article
Copyright
Copyright © Materials Research Society 1996

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References

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5 Leksono, M.W., Oiu, C.H., Melton, W., and Pankove, J.I. in Infrared Luminescence From MOCVD GaN. edited by Carter, C., Gildenblat, G., Nakamura, S., and Nemanich, R. (Mater. Res. Soc. Proc. 339, Pittsburgh, PA, 1994) pp. 559564 Google Scholar

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Excitation Wavelength and Saturation Effects on Gallium Nitride Photoluminescence
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