TITLE

Time-resolved and time-integrated photoluminescence studies of coupled asymmetric GaN quantum discs embedded in AlGaN barriers

AUTHOR(S)
Na, J. H.; Taylor, R. A.; Rice, J. H.; Robinson, J. W.; Lee, K. H.; Park, Y. S.; Park, C. M.; Kang, T. W.
PUB. DATE
February 2005
SOURCE
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p083109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have investigated exciton dynamics in asymmetric GaN quantum discs embedded in AlGaN barriers with an Al content of 50% using time-integrated and time-resolved micro-photoluminescence measurements. Emission from the quantum discs emerges at lower energy than that from the GaN nanocolumns, which suggests that GaN quantum discs are strongly affected by the built-in electric field. The lifetimes of localized excitons in quantum discs were obtained. Nonlinear emission from quantum discs under high excitation power was attributed to tunneling of carriers to larger discs from smaller discs.
ACCESSION #
16581325

 

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