| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
We have investigated the mechanism of the photoluminescence-decay time of the exciton-exciton scattering so-called P emission in semiconductor thin films from the viewpoint of the photon-like polariton state which is created by the exciton-exciton scattering process, and located the lower energy region of the bottle neck in the exciton-polariton picture. From the analysis of the time-resolved photoluminescence spectra observed in the ZnO thin files under the high-density excitation conditions, we have obtained the results that the decay time of the PL band of the exciton-exciton scattering becomes faster with decreasing film thickness. From the analysis of the experimental results, we find that the decay time of the photoluminescence of the exciton-exciton scattering is governed by the conversion time from the exciton state to the polariton state．
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