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Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO

Tobin, Ger and McGlynn, Enda and Henry, Martin O. and Mosnier, Jean-Paul and de Posada, Eduardo and Lunney, James G. (2006) Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO. Applied Physics Letters, 88 . ISSN 0003-6951

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Abstract

We present optically-pumped emission data for ZnO, showing that high excitation effects and stimulated emission / lasing are observed in nanocrystalline ZnO thin films at room temperature, although such effects are not seen in bulk material of better optical quality. A simple model of exciton density profiles is developed which explains our results and those of other authors. Inhibition of exciton diffusion in nanocrystalline samples compared to bulk significantly increases exciton densities in the former, leading, via the nonlinear dependence of emission in the exciton bands on the pump intensity, to large increases in emission and to stimulated emission.

Item Type:Article (Published)
Refereed:Yes
Subjects:Physical Sciences > Physics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Institute of Physics
Official URL:http://dx.doi.org/10.1063/1.2174107
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:2
Deposited On:25 Oct 2006 by DORAS Administrator. Last Modified 06 Mar 2009 15:20

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