Preparation method of Mn < 2 + >-doped CsPbCl3 nanocrystal capable of independently changing halogen content

Abstract

The invention relates to a preparation method of Mn < 2 + >-doped CsPbCl3 nanocrystals capable of independently changing the halogen content, and belongs to the field of semiconductor luminescence. The Mn < 2 + >-doped CsPbCl3 perovskite nanocrystal is synthesized through a halogen thermal injection method, the purpose of independently changing the halogen density under the condition that the Mn < 2 + > doping concentration is fixed is achieved for the first time, and the optical performance and stability of the perovskite nanocrystal are better by adjusting the halogen content, reducing the defect (trap) state and reducing the electron-phonon coupling effect and the thermal degradation effect at high temperature; according to the perovskite nanocrystal disclosed by the invention, the optical properties of excitons and Mn < 2 + > are regulated and controlled by changing the halogen content, and the perovskite nanocrystal has potential nano fluorescent powder application.

Description

technical field [0001] The present invention relates to a kind of Mn whose halogen content can be changed independently 2+ Doping CsPbCl 3 The preparation method of nanocrystal belongs to the field of semiconductor light-emitting. Background technique [0002] All-inorganic CsPbX 3 (X=Cl, Br, or I) perovskite nanocrystals have attracted much attention due to their excellent optical properties, such as near 100% photoluminescence quantum yields (PLQYs) and tunable emission wavelengths over the entire visible region , ultra-narrow luminescence half-peak width, and ultra-long carrier diffusion length, which make them have broad application prospects in photovoltaic devices such as solar cells, light-emitting diodes (LEDs), liquid crystal display backlights, and photodetectors. Incorporating Mn ions into semiconductor nanocrystals can tune their optical and magnetic properties. The luminescence of Mn-doped nanocrystals is not only the band-edge luminescence from the host mat...

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Problems solved by technology

[0004] However, in conventional synthetic methods, MnX is generally 2 and PbX 2 Salt is used as the precursor of manganese, lead and halogen to prepare Mn-doped perovskite nanocrystals, so the content of Mn ions or halogen in the precursor cannot be independently adjusted, so that the doping concentration of Mn ions or the concentration of halogen vacancies cannot be achieved. Individual regulation of two variables to study their effect mechanism on the luminescent properties of Mn ion-doped nanocrystals

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