Room and Low temperature photoluminescence properties of CdSe quantum dots synthesized rapidly in aqueous approach

Thiol-capped CdSe quantum dots are synthesized rapidly in aqueous solution assisted by microwave irradiation without any poisonous materials. Room and low temperature photoluminescence is employed to investigate the excitonic emission from thiol-capped CdSe quantum dots between 83K and 293 K. The photoluminescence peak position of CdSe quantum dots shift to shorter wavelengths and the photoluminescence intensity first enhance and then quench with decrease of temperature. The temperature dependence of the PL spectra is demonstrated through thermal escape and thermal rectification of surface trap states.