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A set of ZnO/Mg0.12Zn0.88O multiple quantum wells (MQWs) with well widths, Lw, varying from 6.91 to 46.5 Å has been grown by laser molecular-beam epitaxy. We estimated the Lw dependence of the radiative and nonradiative recombination times of localized excitons at 5 K. Suppression of quantum efficiency can be avoided even in the MQWs having small Lws studied in this work. Effects of excitonic localization are discussed in order to explain the Lw dependence of radiative recombination time at 5 K.
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Chia et al. (2001) studied this question.
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