Preparation and Properties of High-quality CdSeS Alloyed Quantum Dots in Liquid Paraffin

doi:10.3969/j.issn.0251-0790.2012.07.004

Abstract

Abstract: A phosphine-free route was successfully developed to prepare highly-quality cadmium selenium sulfide(CdSeS) alloyed quantum dots(QDs) using paraffin liquid as the reaction solvent and oleic acid as the ligand. The effects of the reaction temperature, growth time, and the molar ratio of S to Se on the properties of the CdSeS QDs were investigated. The as-prepared alloyed CdSeS QDs with zinc-blend crystalline structure possess a broad emission spectral ranging from 370 nm to 595 nm(from near-ultraviolet to salmon pink) and high photoluminescence quantum yield(PLQY) up to 65%. Moreover, the as-prepared alloyed CdSeS QDs with a gradient "CdS-rich core/CdSe-rich surface" structure also demonstrate good optical stabilities against the temperature change and photobleaching, which suggests their promising application on photoelectric devices and biological fluorescent labeling.

Key words: Ternary alloyed quantum dots, CdSeS, Liquid paraffin, Thermal stability, Optical stability

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ZHANG De-Long, LI Wan-Wan, WANG Xie-Bing, SUN Kang. Preparation and Properties of High-quality CdSeS Alloyed Quantum Dots in Liquid Paraffin[J]. Chem. J. Chinese Universities, 2012, 33(07): 1383.

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Preparation and Properties of High-quality CdSeS Alloyed Quantum Dots in Liquid Paraffin

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