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Time‐Resolved Luminescence of Localized Excitons in CdS 1— x Se x under High Excitation
Author(s) -
Urban M.,
Schwab H.,
Klingshirn C.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221660212
Subject(s) - luminescence , excitation , exciton , saturation (graph theory) , atomic physics , persistent luminescence , two photon excitation microscopy , materials science , molecular physics , chemistry , condensed matter physics , physics , optoelectronics , thermoluminescence , mathematics , combinatorics , quantum mechanics
The temporal evolution of luminescence due to localized excitons in CdS 1— x Se x for various compositions from x = 0.02 to 0.55 is investigated after pulsed excitation ( t ≈ 50 ps). The excitation intensity is varied from 8 × 10 5 W/cm 2 up to 4 × 10 7 W/cm 2 . For the first time the luminescence dynamics is investigated under extremely high excitation into the extended states and it is found that the luminescence decay times, τ D , become shorter and independent from the photon energy for high excitation. This behaviour is caused by the saturation of the localized states under high excitation. The x ‐dependence of the “tailing parameter” and the total density of the localized states are discussed based on the experimental findings.