Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 23 March 2001:
Vol. 291. no. 5512, pp. 2390 - 2392
DOI: 10.1126/science.291.5512.2390
Prev | Table of Contents | Next

Reports

Electrochromic Nanocrystal Quantum Dots

Congjun Wang, Moonsub Shim, Philippe Guyot-Sionnest*

Incorporating nanocrystals into future electronic or optoelectronic devices will require a means of controlling charge-injection processes and an understanding of how the injected charges affect the properties of nanocrystals. We show that the optical properties of colloidal semiconductor nanocrystal quantum dots can be tuned by an electrochemical potential. The injection of electrons into the quantum-confined states of the nanocrystal leads to an electrochromic response, including a strong, size-tunable, midinfrared absorption corresponding to an intraband transition, a bleach of the visible interband exciton transitions, and a quench of the narrow band-edge photoluminescence.

James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
*   To whom correspondence should be addressed. E-mail:pgs{at}uchicago.edu

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Doped Nanocrystals.
D. J. Norris, A. L. Efros, and S. C. Erwin (2008)
Science 319, 1776-1779
   Abstract »    Full Text »    PDF »
Evidence for a diffusion-controlled mechanism for fluorescence blinking of colloidal quantum dots.
M. Pelton, G. Smith, N. F. Scherer, and R. A. Marcus (2007)
PNAS 104, 14249-14254
   Abstract »    Full Text »    PDF »
Three-dimensional Imaging of the Intracellular Localization of Growth Hormone and Prolactin and Their mRNA Using Nanocrystal (Quantum Dot) and Confocal Laser Scanning Microscopy Techniques.
A. Matsuno, J. Itoh, S. Takekoshi, T. Nagashima, and R. Y. Osamura (2005)
J. Histochem. Cytochem. 53, 833-838
   Abstract »    Full Text »    PDF »
n-Type Conducting CdSe Nanocrystal Solids.
D. Yu, C. Wang, and P. Guyot-Sionnest (2003)
Science 300, 1277-1280
   Abstract »    Full Text »    PDF »
Electrochemistry and Electrogenerated Chemiluminescence from Silicon Nanocrystal Quantum Dots.
Z. Ding, B. M. Quinn, S. K. Haram, L. E. Pell, B. A. Korgel, and A. J. Bard (2002)
Science 296, 1293-1297
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)