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We have investigated the photoluminescence (PL) dynamics of crystalline ZnO thin films prepared by an rf-magnetron sputtering method under high-density excitation conditions at 10K using an optical-Kerr gating (OKG) method. In the time-resolved PL spectra, we clearly observed the change of the PL properties with increasing time delay. In the initial time region up to about 5ps, a broad PL band appears...
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