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Influence of the Quantum Island Distribution on Relaxation of Localized Excitons in CdSe/ZnSe Heterostructures
Author(s) -
Dal Don B.,
Dianoux R.,
Wachter S.,
Schmidt M.,
Kurtz E.,
von Freymann G.,
Neuberth U.,
Klingshirn C.,
Wegener M.,
Kalt H.
Publication year - 2002
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 - 10.1002/1521-3951(200201)229:1<463::aid-pssb463>3.0.co;2-k
Subject(s) - photoluminescence , exciton , heterojunction , relaxation (psychology) , excited state , spectroscopy , phonon , condensed matter physics , field (mathematics) , materials science , molecular physics , physics , atomic physics , optoelectronics , quantum mechanics , psychology , social psychology , mathematics , pure mathematics
We report on relaxation of excitons in II–VI heterostructures containing CdSe islands embedded in a ZnSe matrix, and showing different localization properties. We perform spatially resolved photoluminescence (μ‐PL), time‐resolved PL (TRPL), and time‐resolved near‐field spectroscopy (n‐TRPL) to study the differences between two samples. In the sample showing the weaker localization, we see a correlation between the localized states, which is not obvious in the sample with the stronger localization. We consider as possible explanations for these repeated lines phonon‐assisted transport as well as relaxation from excited states into a lower energetic state.