The strength of Forster coupling between CdSe nanocrystal quantum dots (NQDs) via dynamical studies of energy transfer (ET) in close-packed assemblies of mondisperse and mixed-size samples, and a prototype "energy gradient" bilayer structure was evaluated. Through time-resolved and spectrally resolved photoluminescence (PL) dynamics, a fast PL decay on the blue side of the emission band which was dominated by Forster transfer was observed, providing a direct measure of ET efficiency. This observation agrees with the known band-edge structure in CdSe NQDs, wherein a large energy gap separates the lowest emitting transition from the higher-lying strongly absorbing transitions.
|Journal||Physical Review Letters|
|Publication status||Published - Oct 28 2002|
ASJC Scopus subject areas
- Physics and Astronomy(all)