Abstract
In this work, we prepared CdTe quantum dots, and series of Cd1-xMnxTe-alloyed quantum dots with narrow size distribution by an ion-exchange reaction in water solution. We found that the photoluminescence peaks are shifted to higher energies with the increasing Mn2+ content. So far, this is the first report of blue-emitting CdTe-based quantum dots. By means of cyclic voltammetry, we detected features of electrochemical activity of manganese energy levels formed inside the Cd1-xMnxTe-alloyed quantum dot band gap. This allowed us to estimate their energy position. We also demonstrate paramagnetic behavior for Cd1-xMnxTe-alloyed quantum dots which confirmed the successful ion-exchange reaction.
Highlights
The optical properties of quantum dots (QDs) can be manipulated by doping/alloying through designing the composition
There is a high probability of appearance of Zn(OH)2 on the surface of QDs that inhibits the growth of initial QDs by forming ZnO shell on the surface of QDs
Structural Characterization of the CdTe and Cd1-xMnxTealloyed QDs Transmission electron microscopy (TEM) Analysis The TEM images of Cd0.91Mn0.09Te-alloyed QDs indicated that the average diameter is consistent with the diameter of CdTe QDs calculated from the spectroscopic measurements according to the method described in [14]
Summary
The optical properties of quantum dots (QDs) can be manipulated by doping/alloying through designing the composition. The possibility of control over the incorporation of doping/alloying elements into QDs lattices plays an important role for a large number of applications. Synthesis techniques have already been developed for obtaining Mn2+-doped/alloyed ZnS, ZnSe, CdSe, CdS, and core/shell CdTe/CdS QDs [1,2,3,4,5,6]. There is a number of works that describe the capabilities of Mn2+- and Zn2+-doped/alloyed CdTe QDs synthesis [7–10]. Obtaining of such compositions in water solution is strongly pH-dependent that makes doping difficult.
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