Mapping emissive channels of quantum dots: Influence of size and environment on energy transfer in the time domain
Résumé
In the quantum confinement regime, the time-resolved photoluminescence mapping of CdSe nanocrystals reveals unusual size-dependent characteristics in solute or solid-state environments. The former case typifies long-lived intradot exciton recombinations, while in the latter energy-dependent Kohlrausch relaxations quench luminescence via interdot energy transfer. The observed energy transfer rate increases for larger size (1.5×108 s−1 for d = 2.5 nm and 6.4×108 s−1 for d = 10 nm).