Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 43, Issue 28, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/43/28/285402
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Funding
- National Science Foundation [50532090, 60606023, 60621091, 10804126, 10974246]
- Ministry of Science and Technology of China [2007CB936203, 2009CB929400]
- National Synchrotron Radiation Laboratory, Hefei, China
- Research Council of Norway
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Stokes shifts and near-band emission in high-Mg-content single-phase wurtzite Mg(x)Zn(1-x)O (0.27 <= x <= 0.55) epilayers were investigated by photoluminescence (PL) and photoluminescence excitation combining laser and synchrotron excitation experiments. The observed Stokes shifts (e.g. 365 meV for the sample containing 55% Mg) as well as the 'S-shaped' temperature dependence of the maximum PL emissions were explained in terms of Mg compositional fluctuations in our sample resulting in exciton localization in potential traps and, consequently, suppression of non-radiative recombination making high-Mg-content MgZnO a good candidate for optical applications.
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