Abstract
Abstract We have developed a simple one-step process for synthesis of ternary quantum dots (ZnCdSe, MgCdSe) with photoluminescence wavelengths ranging from the red to the blue region of the visible spectrum. The primary aim of this work was to develop a synthesis for the preparation of Cd-containing quantum dots using a Cd precursor with lower toxicity than those used in common syntheses. This synthesis makes use of Cd(acac)2 which is significantly less toxic than precursors such as CdO and CdCl2. We have studied the effect of solvent boiling point, precursors and reaction time on the photoluminescence properties of the ternary quantum dots. Ternary quantum dots synthesized from Cd(acac)2 in low boiling point solvents have photoluminescence wavelengths in the blue region, while those synthesized in high boiling point solvents have photoluminescence wavelengths in the red region.
Highlights
Quantum dots are small semiconductor nanoparticles with electron energy levels that are discrete rather than continuous
There are a number of parameters that influence the synthesis and final properties of ternary quantum dots
We wanted to gradually increase the amount of Zn precursor to study the affect of Zn concentration on the photoluminescence properties of the ZnCdSe quantum dots
Summary
Quantum dots are small semiconductor nanoparticles with electron energy levels that are discrete rather than continuous. The size of the semiconductor nanoparticles determines the spacing of their energy levels and their band gap. The other parameter which controls the band gap of quantum dots is their composition. By controlling both the quantum dot size and composition, it is possible to create quantum dots that absorb light at frequencies spanning the entire solar spectrum. As a result, these materials have great potential for use in photovoltaic applications [1,2,3]
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