Picosecond Time Analysis of Excitonic Molecule Luminescence Spectra in CuCl

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  • Picosecond Time Analysis of Excitonic M

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Time-resolved luminescence spectra in the picosecond region of excitonic molecules in CuCl are studied at 4.2 K under band-to-band and exciton resonance excitations with time resolutions of ∼10 ps and ∼60 ps, respectively. The formation time and the lifetime of excitonic molecules are determined to be \lesssim10 ps and 300 ps, respectively, the latter of which agrees with the radiative lifetime calculated by using existing theories. The relaxation processes of the excitonic molecule system are discussed on the basis of the time variation of the luminescence line shape, and some analyses are made by considering both molecule-molecule collisions and molcule-acoustic phonon interactions. Transient behavior of the stimulated emission due to the excitonic molecule luminescence are also investigated.

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