Abstract
The Stark effect on the electronic absorption spectrum of CdSe nanocrystals has been studied for nanocrystals ranging in size from 80 to 20 Å in diameter. For all but the smallest clusters, a second derivative line shape is observed, indicative of a dipole moment in the excited state. This result is independent of the surface modification and appears in both CdS and CdSe systems. The Δμ ranges from 15±10 D in the smallest clusters and up to 100±10 D in the largest; however, the increase is not monotonic, and in the very largest clusters studied (d≳70 Å), the dipole moment decreases. The dipolar character is lost in clusters less than 25 Å. These results can be explained by a model in which there is resonance of an interior state with a surface state at a particular size, with the mixing occurring on a preferred axis.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:13 a.m.) |
Deposited | 2 years, 1 month ago (July 10, 2023, 12:58 p.m.) |
Indexed | 1 year, 3 months ago (June 4, 2024, 10:19 p.m.) |
Issued | 30 years, 10 months ago (Oct. 15, 1994) |
Published | 30 years, 10 months ago (Oct. 15, 1994) |
Published Print | 30 years, 10 months ago (Oct. 15, 1994) |
@article{Colvin_1994, title={Electric field modulation studies of optical absorption in CdSe nanocrystals: Dipolar character of the excited state}, volume={101}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.468338}, DOI={10.1063/1.468338}, number={8}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Colvin, V. L. and Cunningham, K. L. and Alivisatos, A. P.}, year={1994}, month=oct, pages={7122–7138} }