Journal
PHYSICAL REVIEW B
Volume 80, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.081303
Keywords
cadmium compounds; electronic density of states; excitons; II-VI semiconductors; photoluminescence; semiconductor quantum wires; wide band gap semiconductors
Funding
- David and Lucile Packard Foundation
- National Science Foundation [CHE-0518427]
- Center for Materials Innovation at Washington University
- Chemical Sciences, Biosciences, and Geosciences Division of the Office of Basic Energy Sciences, Office of Science
- U. S. Department of Energy (DOE)
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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.
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