Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5404212 | Journal of Luminescence | 2006 | 6 Pages |
Abstract
The photoluminescence of CdSe/ZnS nanocrystals in toluene at room temperature shows inhomogeneous emission and excitation spectra. This is accompanied by a non-exponential photoluminescence decay on time scales between 1 and 80Â ns. The inhomogeneous behaviour is due to a remaining size distribution, which can be partly photoselected by a combination of excitation and emission wavelengths, which reveals the contribution of at least 4 different electronic states. The identification of these states became possible by the application of a decay time distribution analysis of the photoluminescence decay. In addition to the size-related CdSe exciton emission, two trap or surface states with decay components close to 10 and 80Â ns have been identified. The 80Â ns component is shifted to the red by about 100Â meV from the exciton peak, whereas the 10Â ns component cannot be discriminated spectrally from the exciton band.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
E.P. Petrov, F. Cichos, C. von Borczyskowski,