Abstract
Low-temperature (<40 K) photoluminescence (PL) spectra of individual CdSe nanocrystal quantum wires exhibit narrow (<5 meV) isolated peaks spanning a range ≤50 meV. We attribute these features to emission of excitons localized in shallow (a few meV deep) tight potential minima superimposed on longer-scale and larger-amplitude variations of the potential energy. Spectrally resolved PL dynamics reveal decreasing exciton-decay rates with decreasing emission energy. These observations are consistent with exciton relaxation within a manifold of localization sites characterized by an exponential density of states.
Original language | English |
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Article number | 081303 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 80 |
Issue number | 8 |
DOIs | |
State | Published - Aug 11 2009 |