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Electron–Hole Exchange Induced Stokes Shift in CdTe Nanocrystals
Author(s) -
Chamarro M.,
Lavallard P.,
PérezConde J.,
Bhattacharjee A.K.,
Petrikov V.D.,
Lipovskii A.A.
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<453::aid-pssb453>3.0.co;2-o
Subject(s) - photoluminescence , stokes shift , absorption (acoustics) , luminescence , exciton , electron , cadmium telluride photovoltaics , nanocrystal , quantum dot , molecular physics , radiative transfer , atomic physics , absorption spectroscopy , materials science , spectral line , chemistry , condensed matter physics , physics , optoelectronics , optics , nanotechnology , quantum mechanics
Optical absorption, photoluminescence spectra and luminescence decay of CdTe spherical nanocrystals with zincblende structure are studied. The size selected luminescence peak is shifted to lower energies with respect to the absorption peak. There is a good agreement between the experimental data and the tight‐binding exciton theory predictions. Additionally, the radiative decay time of the emitting state is unusually long. These facts indicate that the resonant Stokes shift arises from electron–hole exchange interaction.