Luminescent properties dependence of water-soluble CdTe quantum dots on stabilizing agents and reaction time

Abstract

The influence of stabilizing agents and reaction time on the luminescent properties of water-soluble CdTe quantum dots (QDs) was discussed. The thioglycolic acid (TGA)-CdTe ODs were characterized by TEM, XRD and FTIR. It is found that larger-size QDs can be synthesized more easily when L-cysteine (Cys) or golutathione (GSH) is chosen as stabilizing agent and TGA is proper to prepare highly luminescent QDs because of the effect between Cd 2+ and sulfhydryl group. Furthermore, the absorption wavelength, full width at half maximum (FWHM), stokes shift, photoluminescence (PL) quantum yield and PL stability of TGA-CdTe are strongly dependent on reaction time, in which the absorption wavelength changes against reaction time with an exponential function. The TGA-CdTe QDs prepared at 2 h possess more excellent luminescent properties.

Effect of ligands on the photoluminescence properties of water-soluble PbS quantum dots

“…Currently, CdSe [20], CdS [24], ZnS [25], CdSe/CdS [26], and CdTe [27] QDs were synthesized by using L-Cys as capping ligand. Among these aqueous QDs, different molar ratio of ligands to monomers (mental ions) plays an important role in the photoluminescence properties.…”

Ultrasensitive Sensor Using Quantum Dots-Doped Polystyrene Nanospheres for Clinical Diagnostics of Low-Volume Serum Samples

“…First of all, the best QD materials are synthesized in hydrophobic surfactants that prevent direct aqueous solubilization, even though several methods have been developed to impart their water solubility. Traditional methods of water solubilization and functionalization of QDs either have low quantum yield or cause irreversible precipitation of the sample. , Thus, common QDs-based FRET detecting systems have been hindered by the insufficient labeling chemistries and the unrobustness in polar solvents, particularly in clinical media such as serum or plasma. Second, high-efficiency FRET relies on the proper donor–acceptor distances, which should be in the range of approximately 1–10 nm.…”