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Preparation method of modified perovskite quantum dots and preparation method of electroluminescent device

An electroluminescent device and quantum dot technology, applied in the field of quantum dots, can solve the problems affecting the fluorescence quantum efficiency and stability of perovskite quantum dots, low fluorescence quantum efficiency and stability of perovskite quantum dots, and electroluminescent devices. Performance impact and other issues, to achieve the effect of improving stability and fluorescence efficiency, improving interface contact characteristics, and passivating interface defects

Pending Publication Date: 2021-11-16
GUANGDONG INST OF SEMICON IND TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, perovskite quantum dots have a large specific surface area, which in turn leads to a high surface defect state density of perovskite quantum dots, and high surface defect state density and low binding energy lead to fluorescent quantum dots in perovskite quantum dots. low efficiency and stability
At the same time, in the process of preparing electroluminescent devices, it is necessary to wash the perovskite quantum dots many times, which will cause a large amount of organic ligands on the surface of the perovskite quantum dots to be washed away, which will affect the fluorescence quantum efficiency and quantum efficiency of the perovskite quantum dots. Stability, which ultimately leads to a huge impact on the performance of perovskite quantum dot electroluminescent devices

Method used

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  • Preparation method of modified perovskite quantum dots and preparation method of electroluminescent device
  • Preparation method of modified perovskite quantum dots and preparation method of electroluminescent device
  • Preparation method of modified perovskite quantum dots and preparation method of electroluminescent device

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preparation example Construction

[0022] The embodiment of the present invention provides a preparation method of modified perovskite quantum dots, comprising:

[0023] Firstly, the perovskite quantum dots are prepared. The preparation of the perovskite quantum dots is well known to those skilled in the art. For example, it can be prepared by the hot injection method in the prior art, or it can be prepared by other methods in the prior art. At the same time, the preparation of perovskite quantum dots is not an improvement point of the embodiment of the present invention, therefore, the embodiment of the present invention will not be described in detail.

[0024] Then, the prepared perovskite quantum dots are cleaned, and the number of times of cleaning can be 1 time or more than 2 times. The purpose of cleaning is to wash away part of the organic ligands on the perovskite quantum dots, and then facilitate the preparation of perovskite quantum dot electroluminescent devices. However, the cleaning process washe...

Embodiment 1

[0036] An embodiment of the present invention provides a perovskite quantum dot. In this embodiment, a perovskite quantum dot is prepared by a hot injection method. The preparation process is as follows:

[0037] First prepare the cesium oleate precursor: a certain amount of cesium carbonate (0.4 grams) is added into octadecene (15 milliliters), and the water vapor and oxygen in the reaction system are evacuated by vacuuming, which shows that the liquid level of the reaction system is not high. Until bubbles appear again, heat up to 120°C during the vacuuming process, add 1.2 ml of oleic acid into the reaction system, stop vacuuming when no bubbles appear, pass in nitrogen protection, and then continue to heat up to 150°C, at this time The solution will appear clear and the cesium carbonate will react to cesium oleate.

[0038] Synthesis of perovskite quantum dots: Dissolve lead bromide (0.069 g) in octadecene (5 milliliters), vacuumize to remove oxygen and water vapor as desc...

Embodiment 2

[0044] This embodiment provides a preparation method of modified perovskite quantum dots, including:

[0045] Add excess polytrihexylthiophene to 30 ml of n-octane, stir for more than 5 minutes at room temperature, and then filter to obtain a saturated solution of polytrihexylthiophene.

[0046] Then, disperse 20 mg of the perovskite quantum dots prepared in Example 1 after washing twice into 1 ml of the above-mentioned polytrihexylthiophene solution to form a mixed solution to obtain modified perovskite quantum dots.

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Abstract

The invention relates to the technical field of quantum dots, in particular to a preparation method of modified perovskite quantum dots and a preparation method of an electroluminescent device. The preparation method of the modified perovskite quantum dots comprises the following step that: perovskite quantum dots are dispersed in a conjugated polymer solution, and a conjugated polymer in the conjugated polymer solution is a polymer which has photoelectric activity and can improve the dispersibility and luminescence performance of the perovskite quantum dots. According to the preparation method of the modified perovskite quantum dots and the preparation method of the electroluminescent device of the embodiment of the invention, by adding P3HT, the dispersibility of the perovskite quantum dots in solvents such as n-octane and the interface contact characteristic of the perovskite quantum dots in a photoelectric device can be improved, the stability and fluorescence efficiency of the perovskite quantum dots in a solution can be improved, meanwhile, the interface defects of the perovskite quantum dots can be passivated, and the performance of the electroluminescent device can be improved.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a preparation method of modified perovskite quantum dots and a preparation method of electroluminescent devices. Background technique [0002] Quantum dots are semiconductor nanostructures that bind internal electrons in three spatial directions. The diameter is generally between 1 and 100 nanometers. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a molecular characteristic. The discrete energy level structure can emit fluorescence after being excited, and the spectrum consists of a series of line spectra of transitions between bands. Among them, perovskite quantum dots are a new type of optoelectronic material, which has the advantages of ultra-high photoluminescence quantum efficiency (90%), narrow line width (12-40nm), wide color gamut, and solution synthesis and processing. It shows great application potential in the fields ...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/52H01L51/56
CPCH10K85/113H10K50/115H10K50/84H10K71/00
Inventor 王建太龚政邹胜晗郭婵庞超潘章旭胡诗犇刘久澄陈志涛
Owner GUANGDONG INST OF SEMICON IND TECH
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