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

A technology of optical thin films and quantum dots, applied in organic semiconductor devices, photovoltaic power generation, luminescent materials, etc., can solve the problems that the absorption and fluorescence characteristics cannot be independently designed, the light absorption coefficient is low, and the charge transport capacity of the film needs to be improved. Fluorescence quantum efficiency and chemical stability, the effect of improving light energy absorption and reducing energy loss

Active Publication Date: 2018-06-22
SHANGHAI BEEN SEMICON TECH CO LTD
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  • Application Information

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 electroluminescence can be greatly improved, but the charge transport ability of this film needs to be improved
In addition, the above existing methods cannot meet the application requirements of high-efficiency photoluminescence and photodetection devices due to the low light absorption coefficient of the material, and the absorption and fluorescence characteristics cannot be independently designed.

Method used

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

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] The CsPbBr of organic conjugated small molecule C8-BTBT structural formula and perovskite structure used in the following examples 3 Such as figure 1 Shown, CsPbBr 3 Quantum dots are synthesized by high-temperature thermal injection method, and the specific steps are as follows:

[0028]1) Preparation of cesium oleate: Take 0.2g of cesium carbonate, 10mL of octadecene, and 0.6mL of oleic acid into a 25mL three-necked flask at the same ti...

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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),...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66H01L51/54H01L51/46
CPCC09K11/025C09K11/664H10K85/00H10K85/6576H10K2102/00Y02E10/549
Inventor 王向华张春雨黄玲玲刘中梦雪
Owner SHANGHAI BEEN SEMICON TECH CO LTD
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