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We have studied the dynamics of highly dense exciton and electron-hole (e-h) systems in GaN by means of optical Kerr-gate time-resolved photoluminescence (PL) spectral measurements. In high-density e-h pairs above the Mott density, the broad electron-hole plasma emission appears at first, and then the narrow PL due to the biexciton and the inelastic exciton-exciton scattering is observed. When the pump light resonantly excites the A excitons, highly dense e-h systems with low effective temperatures are formed, and unique PL bands are observed. These PL peaks can be explained by a picture that the A excitons are scattered into the A,0.2em0exB, and C bands.
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Nagai et al. (2005) studied this question.
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