Australian Journal of Chemistry Australian Journal of Chemistry Society
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Luminescence Modulation with Semiconductor Quantum Dots and Photochromic Ligands

Massimiliano Tomasulo A , Ibrahim Yildiz A and Françisco M. Raymo A B

A Center for Supramolecular Science, Department of Chemistry, University of Miami, FL 33146-0431, USA.

B Corresponding author. Email: fraymo@miami.edu

Australian Journal of Chemistry 59(3) 175-178 http://dx.doi.org/10.1071/CH05332
Submitted: 2 December 2005  Accepted: 29 January 2006   Published: 24 March 2006

Abstract

We have attached a photochromic spiropyran to the surface of CdSe–ZnS core–shell quantum dots, relying on a dithiolane anchoring group. In the resulting assembly, the reversible interconversion of the photochromic component activates and suppresses an energy transfer pathway from the excited quantum dots to the coloured state of the ligand. As a result, the luminescence intensity decreases by 45% with the photoinduced colouration of the spiropyran and returns to the original value after the thermal reisomerization of the ligand.


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