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).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)