Energy and Charge Transfer Dynamics Between Alq3 and CdSeS Nanocrystals

The photoluminescence properties of the blend films consisting of organic small molecules and nanocrystals (NCs)-Alq(3) and CdSeS NCs-were studied by steady-state and time-resolved photoluminescence (PL) spectroscopy with different excited wavelengths. Both the fluorescence intensity and lifetime are intensively dependent on the NC concentration. The detailed analysis of experiment data proves that Forster energy transfer from the Alq(3) to the NCs exists simultaneously with the charge transfer and both compete with each other in the blend films.