Linearly polarized ‘fine structure’ of the bright exciton state in individual CdSe nanocrystal quantum dots
- 22 January 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 77 (3), 035328
- https://doi.org/10.1103/physrevb.77.035328
Abstract
We report polarization-resolved, low-temperature, high-spectral-resolution studies of the photoluminescence from individual CdSe nanocrystal quantum dots (NQDs). The spectra reveal a ‘fine structure’ splitting of the bright exciton state in a subset of the studied NQDs. The two fine structure states are spectrally separated by an energy of up to depending on NQD size and are characterized by linearly (and orthogonally) polarized emission dipoles. The average splitting scales approximately with inverse NQD volume, consistent with an anisotropic electron-hole exchange interaction which can result from a breakdown of cylindrical symmetry in some of the NQDs.
Keywords
This publication has 30 references indexed in Scilit:
- Near-infrared fluorescent type II quantum dots for sentinel lymph node mappingNature Biotechnology, 2003
- Biological applications of colloidal nanocrystalsNanotechnology, 2003
- Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetimeApplied Physics Letters, 2003
- Optical Gain and Stimulated Emission in Nanocrystal Quantum DotsScience, 2000
- Exchange interaction and phonon confinement in CdSe quantum dotsPhysical Review B, 1996
- Size dependence of exciton fine structure in CdSe quantum dotsPhysical Review B, 1996
- Semiconductor Clusters, Nanocrystals, and Quantum DotsScience, 1996
- Enhancement of electron-hole exchange interaction in CdSe nanocrystals: A quantum confinement effectPhysical Review B, 1996
- Observation of the "Dark Exciton" in CdSe Quantum DotsPhysical Review Letters, 1995
- Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymerNature, 1994