Optical properties of CsPbI3 quantum dots in different polar solvents

doi:10.3969/j.issn.1000-1565.2020.06.004

Abstract

Abstract: All-inorganic perovskite CsPbI₃ quantum dots have the characteristics of narrow emission spectrum lines, high fluorescence quantum yield, and strong stability. They have broad application prospects in the fields of red LEDs and new solar cells. In this paper, CsPbI₃ quantum dots were synthesized in n-hexane solvent by hot injection method, and their structure and optical characteristics were characterized. The results show that the main light-emitting mechanism of quantum dots is free exciton recombination in the weak quantum confinement region. The optical properties of the quantum dots were adjusted by changing the type of solvent(n-hexane, toluene, ethyl acetate, methyl acetate). It was found that the luminescence peak position shifted from 615 to 660 nm as the polarity of the solvent increased. This is because the polar solvent has a modification effect on the surface of the quantum dots, and the conditions for adjusting the emission peak position of CsPbI₃ quantum dots by changing the polarity of the solution provide an experimental reference for the preparation of wavelength-tunable photovoltaic devices.

Key words: CsPbI₃, polar solvents, surface modification, light-emitting diodes

CLC Number:

O469

SUN Chunyu, LI Jing, WANG Xinzhan, GUO Chengsuo, YU Wei. Optical properties of CsPbI₃ quantum dots in different polar solvents[J]. Journal of Hebei University(Natural Science Edition), 2020, 40(6): 585-590.

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Optical properties of CsPbI₃ quantum dots in different polar solvents

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