Figure 9.

(a) Schematic of the QD-QD interactions induced by Wargnier et al. QDs coated with a mixture of mecaptosuccinic and mercaptosulfonic acids or cysteamine exhibited negative or positive surface charges, respectively. The opposing charges of these acid and amine terminal groups cause the QDs to aggregate. Schematic is not drawn to scale; (b) PL spectra for pure donor (G-QDs), pure acceptor (R-QDs), and mixed dots. The dotted lines represent the contributions from pure donor and acceptors to the mixed population PL; (b) reprinted with permission from [99]. Copyright (2004) American Chemical Society.