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Perovskite nanocrystalline ink, electroluminescent device and preparation method

A perovskite and nanocrystalline technology, applied in the fields of electric solid device, semiconductor/solid device manufacturing, electrical components, etc., can solve problems such as easy clogging of nozzles and easy generation of coffee rings.

Active Publication Date: 2021-04-09
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The perovskite quantum dot ink provided by the prior art is easy to block the nozzle during the inkjet printing process, and it is easy to produce the coffee ring phenomenon

Method used

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  • Perovskite nanocrystalline ink, electroluminescent device and preparation method
  • Perovskite nanocrystalline ink, electroluminescent device and preparation method
  • Perovskite nanocrystalline ink, electroluminescent device and preparation method

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preparation example Construction

[0064] On the other hand, an embodiment of the present invention also provides a method for preparing a perovskite nanocrystal ink, the method comprising: dispersing a perovskite nanocrystal material in a solvent system to obtain a perovskite nanocrystal ink. Among them, the solvent system includes: a low boiling point solvent with a boiling point of 115°C-175°C; and a high boiling point solvent with a boiling point of 230°C to 260°C; the surface tension and viscosity of the low boiling point solvent are respectively smaller than those of the high boiling point solvent.

[0065] Further, the solvent system also includes: a medium boiling point solvent with a boiling point of 175°C-230°C, and the surface tension of the medium boiling point solvent is between the surface tension of the high boiling point solvent and the low boiling point solvent; wherein, the viscosity of the medium boiling point solvent Between the viscosity of high boiling point solvents and low boiling point s...

example 3

[0073] As Example 3, the electroluminescent device includes: a transparent conductive electrode, an electron transport layer, a nanocrystalline light-emitting layer, a hole transport layer, and a metal electrode stacked sequentially from bottom to top.

[0074] As a fourth example, the electroluminescent device may include: a transparent conductive electrode, an electron injection layer, an electron transport layer, a nanocrystalline light-emitting layer, a hole transport layer, a hole injection layer, and a metal electrode stacked sequentially from bottom to top.

example 5

[0075] As Example 5, the electroluminescent device may include: a transparent conductive electrode, a nanocrystalline light-emitting layer, and a metal electrode stacked sequentially from bottom to top.

[0076] Each of the above functional layers can be common in the field, the following are examples:

[0077] The electron injection layer can be LiF, NaF, Liq, Cs 2 CO 3 、CsN 3 .

[0078] The electron transport layer can be a metal oxide, a metal composite oxide, a metal coordination compound or an organic substance, for example, it can be inorganic nanoparticles such as ZnO, ZnMgO, ZnAlO, or an electron transport organic small molecule, such as TPBi(1, 3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene), Alq 3 (8-quinoline aluminum), BPhen (4,7-diphenyl-1,10-phenanthroline), etc.

[0079]The material of hole transport layer can be PEDOT:PSS (wherein, PEDOT is the polymer of EDOT (3,4-ethylenedioxythiophene monomer), and PSS is polystyrene sulfonate.), (poly(9,9 -dioctylfluo...

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Abstract

The invention discloses a perovskite nanocrystal ink, an electroluminescence device and a preparation method, and belongs to the field of printing and display. The perovskite nanocrystal ink includes: perovskite nanocrystal material, and a solvent system for dispersing the perovskite nanocrystal material. The solvent system includes: a low-boiling solvent with a boiling point of 115°C-175°C; a boiling point of 230°C-175°C; High boiling point solvent at 260°C; surface tension and viscosity of low boiling point solvent are less than those of high boiling point solvent respectively. By adjusting the volume ratio of the low-boiling point solvent and the high-boiling point solvent, the boiling point of the solvent system can be adjusted to the desired range, so that the ink is suitable for dispersing perovskite nanocrystals, and can obtain the desired volatility to ensure inkjet feasibility and avoid Block the nozzle, and can effectively avoid the coffee ring phenomenon. By adjusting the surface tension and viscosity of the solvent system to the desired range, the spreading ability of the perovskite nanocrystal ink and the printability after inkjet are ensured, and the printing effect is improved.

Description

technical field [0001] The invention relates to the field of nanocrystal display, in particular to a perovskite nanocrystal ink, an electroluminescence device and a preparation method. Background technique [0002] Perovskite quantum dots are widely used in electroluminescent devices and related display fields due to their advantages such as easy tuning of luminescence, narrow emission spectrum, high quantum efficiency, high color purity, and low production cost. At present, perovskite quantum dot inks are mostly used for inkjet printing to prepare patterned quantum dot light-emitting layers. Therefore, it is very necessary to provide a perovskite quantum dot ink. [0003] The perovskite quantum dot ink provided in the prior art includes nonpolar solvents such as hexane and octane, and perovskite quantum dot materials dispersed in the nonpolar solvent. [0004] The inventor finds that there are at least the following problems in the prior art: [0005] The perovskite quan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50C09D11/328C09D11/36H01L51/50H01L51/56
CPCC09D11/50C09D11/328C09D11/36H10K71/135H10K50/115H10K71/00
Inventor 魏昌庭宋继中陈征董宇辉曾海波
Owner BOE TECH GRP CO LTD