Exciton radiative recombination in spherical CdS/CdSe/CdS quantum-well nanostructures
by Xu, J. F.; Xiao, M.; Battaglia, D.; Peng, X. G.
Photoluminescence (PL) and lifetimes of colloidal CdS/CdSe/CdS (core/well/shell) quantum-well (QW) nanostructures are investigated for different well thicknesses in the temperature range of 77-300 K. When the temperature increases, the PL intensity decreases continuously and PL peak shifts to lower energy side. The PL lifetimes for the 1-3 monolayer (ML) CdSe QWs increase with temperature and radiative recombination dominates the decay processes. The radiative lifetimes basically increase linearly with temperature, which indicates the existence of free two-dimensional excitons. For the 4 ML CdSe QW sample, the lifetime does not increase with temperature, showing more nonradiative processes due to more defect formation within the thicker QWs.
- Journal
- Applied Physics Letters
- Volume
- 87
- Issue
- 4
- Year
- 2005
- URL
- https://dx.doi.org/10.1063/1.2001731
- ISBN/ISSN
- 1077-3118; 0003-6951
- DOI
- 10.1063/1.2001731