光处理对量子点薄膜中超快激子动力学特性的影响

he observations of photo-induced flourescene enhancement (PFE) in CdSe quantum dot thin films are reported in this paper, as well as the increases in lifetimes and blue-shift spectra. The ultrafast flourescence dynamics observed after two hours illumination, in comparison with that before illumination, indicate that the resultant accumulation of space charge during illumination inhibits the charge transfer and surface trapping, consequensely leading to higher probability of radiative recombination, increasing the flourescence lifetime and relative proportion, making a primary contribution to PFE. Furthermore, the blue-shifting of spectra is due to photooxidation.