Effect of the elememtal ratio of Cd to Se on the luminescent properties of CdSe quantum dots

doi:10.3969/j.issn.1000-1565.2022.05.003

Abstract

Abstract: Cadmium selenide(CdSe)quantum dots have the advantages of high fluorescence quantum yield, good stability and easy spectrum adjustment. They have broad application prospects in the fields of light-emitting diodes, solar cells and fluorescent labeling etc. It is of great significance to study the effects of different process conditions on their properties. Using mercaptopropionic acid(3-MPA)as coating agent, a series of CdSe quantum dots have been prepared by aqueous reflux reaction at 100 ℃ for 120 min. The changes of morphology, band gap and optical properties of the samples with different elemental ratio of Cd to Se are discussed. The size of CdSe quantum dots is about 2.19 nm to 2.57 nm. The strongest excitation peak locates at 431 nm, the emission peak is at 561 nm, and the absorption spectrum blueshifts from 460 nm to 450 nm, indicating that the elemental ratio of Cd to Se has great influence on the properties of CdSe quantum dots.

Key words: CdSe, mercaptopropionic acid, luminescent properties

CLC Number:

O482.31

DING Yanan, ZHENG Yibo, LAI Weidong, LI Shuguang, WEI Zhiren, LI Zhiqiang, WANG Chunsheng. Effect of the elememtal ratio of Cd to Se on the luminescent properties of CdSe quantum dots[J]. Journal of Hebei University(Natural Science Edition), 2022, 42(5): 463-467.

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