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Abstract
Time-resolved measurement is performed for photoluminescence around 2.0 eV which originates from internal transition between 3d multiplet states in Mn based semimagnetic semiconductors. Observed emission spectra show red shift with delay time after excitation. Larger shift is observed in the sample with larger width of the emission spectrum, which implies that the shift is caused by the energy relaxation in the inhomogeneous distribution of the Mn energies. To confirm this, we perform simple Monte-Carlo simulation in a wide range of time scale. The results well explain the magnitude of the shift and its logarithmic dependence on delay time. The dependences on excitation energy, temperature and pressure are also investigated.
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