Evolution of Luminescence Properties of CdTe Quantum Dots in Liquid/Solid Environment

We studied the luminescence behavior of different sized CdTe quantum dots (QDs) dispersed in liquid solution, close-packed films and layer-by-layer assembled films respectively. The changes of emission color from CdTe QDs in water droplets during the evaporation of solvent have been observed. The quenching of the emission from small dots accompanied by the enhancement of the emission from large dots indicate that Förster resonance energy transfer processes occur from donors (small dots) to acceptors (large dot) for CdTe QDs system. Excitation (PLE) spectra confirm that the changes of the luminescence were attributed to the resonance energy transfer between small and larger dots in a mixed QD system.