Alloyed quantum dots: study of the synthesis dynamics and determination of the fluorescence temperature dependence

Abstract

Nanosized crystals of semiconductors, which were called quantum dots (QDs) seemed to be very perspective in different applications since their appearance. Cadmium chalcogenide QDs are most used because of their fascinating properties including long colloidal and optical stability, high fluorescence intensity, wide absorption spectra and narrow fluorescence peaks. In past decade researchers focused their attention on alloyed QDs because their optical properties can be tuned more easily though they keep all the best properties of heterostructure-based QDs and the alloyed QDs synthesis is highly reproducible. Alloyed quantum dots were already implied as fluorescent markers, in solar cells and other fields of actual technologies. However, operating with multicomponent systems is always a non-trivial task, so synthesis of high-performance alloyed QDs with peaks fluorescence on the whole visible spectra is still challenging.

Here we present our study of the alloyed CdZnSeS QDs synthesis conditions in non-polar solvent via one-pot hot injection method. In this work we acquired batch of alloyed CdZnSeS QDs samples with fluorescence peak wavelengths in 530-630 nm region, compared their real and theoretical composition, determined relationship between optical properties and synthesis conditions. Influence of direct synthesis variables such as time, temperature, and reagents concentrations were also discussed. We also investigated dependency between alloyed CdZnSeS QDs fluorescence intensity and temperature in aquatic medium. Transfer of QDs were performed through reaction of ligand exchange. Collected data allowed us to make conclusions about applying alloyed QDs as thermal fluorescence markers.


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Speaker

Kornilov Danila
Saratov State University
Russian Federation

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