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19 October 2012 Optical pumped stimulated emission in ZnO-based quantum wells grown by PLD
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Two series of MgxZn1-xO/ZnO multiple quantum wells with 18 at.% and 27 at.% of magnesium content in barrier layers and well width Lw from 1 nm to 20 have been grown by pulsed laser deposition method. The stimulated emission is observed in photoluminescence spectra excited by pulsed laser (λexc=248 nm). The pump density threshold of stimulated emission nonmonotonously depends on the well width that is associated with an increase of the internal quantum efficiency of two-dimensional structures caused by a reduction of radiative lifetime of excitons at decreasing of the well width as it has been shown by the time-resolved photoluminescence spectra analysis. The minimum value of a lifetime τr=355 ps was obtained for the Mg0.27Zn0.73O/ZnO MQW with the well width Lw=2.6 nm.
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A. A. Lotin, O. A. Novodvorsky, D. A. Zuev, L. S. Parshina, and O. D. Khramova "Optical pumped stimulated emission in ZnO-based quantum wells grown by PLD", Proc. SPIE 8463, Nanoengineering: Fabrication, Properties, Optics, and Devices IX, 84630I (19 October 2012);

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