Microwave synthesis of CdTe quantum dots and its two-photon fluorescence imaging application

GSH-stabilized high-luminescent CdTe quantum dots(QDs) were prepared using Na2TeO3 as the Te source by microwave irradiation in aqueous phase presented.The emission peak of CdTe QDs ranged from 515-630nm and the high quantum yield reaches as high as 95%.The obtained CdTe QDs were characterized by X-ray diffraction pattern(XRD),high resolution transmission electron microscopy(HRTEM),UV-Vis absorption and photoluminescence(PL) spectra.The two-photon absorption property of GSH-CdTe QDs was investigated using the two-photon excitation fluorescence measurement.In addition,human lung carcinoma cells(A549) were labeled using red-emitting GSH-CdTe QDs as a fluorescence probe by two-photon fluorescence imaging technique.