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Formation and decay dynamics of excitonic photoluminescence in GaAs/AlGaAs superlattice under an electric field

Bildungs- und Zerfallsdynamik exzitonischer Photolumineszenz in einem GaAs/AlGaAs Übergitter im elektrischem Feld
: Schneider, H.; Fujiwara, K.; Kanamoto, R.


Applied Physics Letters 66 (1995), pp.905-907
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
exciton dynamics; Exziton-Dynamic; superlattice; time-resolved photoluminescence; Übergitter; zeitaufgelöste Photolumineszenz

Photoluminescence (PL) dynamics of localized excitons in a strongly coupled 40 A/40 A GaAs/Al0.2Ga0.8/As superlattice under an electric field along the growth direction is reported. At zero field, a delayed PL formation due to the relaxation of dark'excitons into radiative states is observed. With increasing field, both the PL decay time and the PL amplitude are strongly reduced. A rate equation analysis of the measured PL transients gives evidence that the field-induced dissociation of nonradiative excitons is important.