Optical processes in the formation of stimulated emission from ZnO nanowires |
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Authors: | Liu Rui-Bin Pan An-Lian Wang Fei-Fei and Zou Bing-Suo |
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Institution: | Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Micro--Nano Technologies Research Center, Hunan University, Changsha 410082, China |
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Abstract: | This paper studies power dependent photoluminescence spectra, the
stimulated emission occurring at ultraviolet (UV) band instead of the
green emission band of ZnO nanowires, which are prepared with a
chemical reduction method. The dynamics of the UV emission and green
emission
is given to demonstrate the reason of stimulated emission occurring at UV
band but not the green emission band under high excitation, which indicates
that the slow decay rate of trap state makes it easy to be fully filled and
saturated, while the fast decay rate of near-band-edge exciton state makes
the UV emission dominate the radiative recombination under high excitation.
The UV emission, as well as the corresponding stimulated emission, occurs in
competition with the green deep-trap emission. In addition, when pump
fluence further increases, the multiple lasing modes appear. The dependence
of these lasing modes on the pump fluence is first discussed. This diagram
should be helpful to understand and design the optical nanodevices of ZnO
nanowires. |
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Keywords: | ZnO nanowire stimulated emission dynamics lasing mode |
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