Format

Send to

Choose Destination
Nano Lett. 2008 Aug;8(8):2384-7. doi: 10.1021/nl801241m. Epub 2008 Jul 22.

Large blue shift of the biexciton state in tellurium doped CdSe colloidal quantum dots.

Author information

1
Department of Physics Complex Systems, Weizmann Institute of Science, Complex Systems, Rehovot, Israel.

Abstract

The exciton-exciton interaction energy of tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.

PMID:
18642954
DOI:
10.1021/nl801241m

Supplemental Content

Full text links

Icon for American Chemical Society
Loading ...
Support Center