Optical thin film based on inorganic perovskite quantum dot and conjugated organic small molecule eutectic structure

Abstract

The invention discloses an optical thin film based on an inorganic perovskite quantum dot and a conjugated organic small molecule eutectic structure. The optical thin film is characterized in that theoptical thin film based on the inorganic perovskite quantum dot and conjugated organic small molecule eutectic structure is obtained by commonly dispersing the inorganic perovskite quantum dot and aconjugated organic small molecule into an organic solvent to form a composite dispersion solution, and carrying out a dipping and drawing, inkjet printing or spin-coating technology on the composite dispersion solution to form the film. According to the optical thin film disclosed by the invention, components can be quantitatively controlled based on components of the composite dispersion solutionto form the eutectic structure, and multiple beneficial effects are provided for functionalized application of the thin film; the fluorescence quantum efficiency and the chemical stability of a quantum dot material can be improved; the thin film can be used for detecting high-energy rays based on absorption properties and a photophysical process of the material designed by the system; a conjugated organic small molecule material with high mobility can reduce energy loss caused by charge injection and transmission under a current driving condition.

Description

technical field [0001] The invention relates to the field of all-inorganic perovskite quantum dot materials, in particular to a composite material system of halogen perovskite quantum dots and small molecule organic semiconductors. Background technique [0002] All-inorganic metal halide perovskite material CsPbX 3 (X=Cl, Br, I, Cl / Br, Br / I) and their quantum dot materials have received extensive attention for their excellent optical properties, especially the halogenated perovskite materials prepared by the solution process, which will be applied For the development of next-generation low-cost, high-performance optoelectronic devices. Of particular concern is that photovoltaic devices based on this type of perovskite materials have energy conversion efficiencies as high as 20%; however, compared with the well-known CdSe quantum dots, the absorption cross section σ of perovskite quantum dots is much smaller (nearly one order of magnitude, NanoLett-2016, Nikolay S.Makarov),...

AI Technical Summary

Problems solved by technology

The problem that this technical scheme exists is that CsPbBr 3 /Cs 4 PbBr 6 The preparation process of the composite film is complicated, and the composition of the composite film is difficult to quantitatively control

CsPbBr in thin film form 3 , and by introducing a small amount of polyethylene oxide (PEO) to improve the film morphology, the quantum efficiency (~4%) and luminous brightness of

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