We measure picosecond time resolved luminescence spectra in GaAs quantum wells using frequency upconversion luminescence spectroscopy. A careful line-shape analysis of the spectra is performed to separate the free exciton and free carrier related luminescence. From the time evolution of the free carrier luminescence, we deduce the characteristic time constant (τf) for the bimolecular process of exciton formation by free electron-hole pairs. For an estimated initial carrier density of 4×{}10¹⁰ cm^-2, τf is found to be 50 ps. {} 1996 The American Physical Society.
No takes yet. Share an insight, caveat, or question.
Kumar et al. (1996) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: