Luminescence spectra of two-dimensional electron gases measured in magnetic fields up to 32T and temperature range between 150mK and 10K are reported. Systems with appreciable disorder exhibit magneto-oscillations in the total intensity and the line-width. These oscillations are interpreted in terms of a magnetic-field modulation of the screening efficiency. Recombination spectra of high-mobility electron gases show unusual features around integer filling factors ν. The observed red-shifts of the luminescence line at ν=1, 2 are attributed to the discontinuous transition across the filling factor from a recombination dominated by an excitonic effect to a recombination dominated by the much stronger electron–electron interaction effects. A doublet-like emission observed at ν=3, 5 is assigned to final state interactions involving spin wave excitations and can be viewed as the Anderson–Fano resonance in the Fock space.