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Universality of the Stokes Shift for a Disordered Ensemble of Quantum Dots
Author(s) -
Patanè A.,
Levin A.,
Polimeni A.,
Eaves L.,
Main P.C.,
Henini M.,
Hill G.
Publication year - 2001
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(200103)224:1<41::aid-pssb41>3.0.co;2-s
Subject(s) - quantum dot , laser linewidth , stokes shift , condensed matter physics , blueshift , thermalisation , spectral line , physics , electroluminescence , absorption spectroscopy , molecular physics , materials science , optoelectronics , photoluminescence , atomic physics , quantum mechanics , nanotechnology , luminescence , laser , layer (electronics)
We present a study of carrier redistribution in In x Ga 1— x As/GaAs self‐assembled quantum dots (QDs) by comparing electroluminescence (EL) and photocurrent (PC) spectra. We show the existence of a red‐shift of the dot emission in EL relative to the dot absorption in PC, referred to as the Stokes shift (SS). The existence of the SS is explained in terms of a thermal redistribution of carriers between dots. According to the thermalization model, the SS increases with the linewidth of the QD absorption spectrum. We show that for a large variety of quantum dots, differing in the material system and/or the growth technique, the SS has a universal dependence on the QD absorption linewidth.