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Quantum dot material having inorganic ligand as well as preparation and application of quantum dot material

A technology of quantum dot materials and inorganic ligands, which is applied to quantum dot materials with inorganic ligands and their preparation and application fields, can solve problems such as dispersibility and luminescence quantum efficiency, and achieves convenient operation, low turn-on voltage, and technology. simple effect

Inactive Publication Date: 2018-07-13
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for ligand exchange of quantum dots, aiming at solving the problems of dispersion and luminescence quantum efficiency after exchanging organic ligands of quantum dots with inorganic ligands, and applying it in electroluminescent devices, Obtained better electrical properties and fluorescence thermal stability

Method used

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  • Quantum dot material having inorganic ligand as well as preparation and application of quantum dot material
  • Quantum dot material having inorganic ligand as well as preparation and application of quantum dot material
  • Quantum dot material having inorganic ligand as well as preparation and application of quantum dot material

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Embodiment 1

[0039] A quantum dot material with inorganic ligands, the preparation method of which is:

[0040] Take 56 mg of potassium hydroxide, add 10 mL of methylformamide solvent, stir and dissolve to form an inorganic ligand solution. 20 mg of green light CdSe / ZnS quantum dots of oleic acid ligand and 10 mL of n-hexane were mixed with the inorganic ligand solution, stirred at room temperature and air for 10 minutes for ligand exchange; the upper layer of n-hexane for ligand exchange was removed, Another 10 mL of n-hexane was added, stirred for 10 minutes, and this removal-addition process was repeated 3 times.

[0041] Then add 20mL acetonitrile to precipitate the quantum dots after ligand exchange, centrifuge, remove the supernatant, add 1mL butylamine to the precipitate, and add 20uL ammonium sulfide solution with a concentration of 20% as a cosolvent at the same time, complete the dissolution, and obtain body quantum dots. Its infrared spectrum is as figure 2 As shown in b(2),...

Embodiment 2

[0045] Such as Figure 5 Shown, a kind of photoluminescence device comprises the conductive glass with hole transport layer material, is provided with the quantum dot material with inorganic ligand described in embodiment 1 on the hole transport layer material of conductive glass, has inorganic Electron transport layer materials and metal electrodes are sequentially deposited on the quantum dot material of the ligand.

[0046] The preparation method of above-mentioned photoluminescence device is:

[0047] Step a: Prepare a nickel oxide film (NiO film) as a hole transport layer on a clean conductive ITO glass substrate. The preparation method is: add ethylenediamine and ethylene glycol to nickel nitrate hexahydrate and stir at 70 ° C The NiO precursor solution was formed in 3 hours, and the molar ratio of the three compounds was 1:1:1. The NiO precursor solution was spin-coated on a clean conductive ITO glass substrate, and sintered in a muffle furnace at 300°C for 60min to o...

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Abstract

The present invention provides a quantum dot material having an inorganic ligand as well as preparation and an application of the quantum dot material. The quantum dot material having the inorganic ligand is characterized in that the preparation method of the quantum dot material comprises the following steps: preparing an inorganic ligand solution; mixing quantum dots having a long-chain organicligand on the surface and the inorganic ligand solution, and performing stirring for ligand exchange; and adding a poor solvent to precipitate the quantum dots subjected to ligand exchange, performingcentrifugation to remove a supernatant, adding an amine solvent into a precipitate, and adding a sulfide cosolvent to complete dissolution, so as to obtain the quantum dot material having the inorganic ligand. According to the method provided by the present invention, quantum dots are dissolved into the amine solvent after being exchanged with the inorganic ligand, and the method can realize spincoating film formation, is convenient for operation, prepares a light emitting layer and a transport layer in a room-temperature air environment, and has possibility of mass production; and a quantumdot electroluminescent device prepared by the quantum dot material has a lower turn-on voltage, and a film prepared from the ligand-exchanged quantum dots has fluorescence thermal stability.

Description

technical field [0001] The invention relates to quantum dots with inorganic ligands and their preparation and application. Background technique [0002] Quantum dot light conversion materials can cover the entire visible light band, have adjustable band gap, high luminous efficiency, and simple preparation. They have attracted much attention in the field of light-emitting diodes and may replace traditional light sources. Three or more quantum dots are arranged in a certain way, and after being assembled, they can become a module that emits white light. Quantum dot light-emitting diodes (QLEDs) are more energy-efficient than organic light-emitting diodes (OLEDs) at the same image quality. [0003] The stability of QLED is the main problem that needs to be solved before its commercialization. The main reason is that a large number of long-chain organic ligands are used on the surface of quantum dots. unstable. Ligands on the surface of quantum dots play an important role in...

Claims

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Application Information

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IPC IPC(8): C09K11/02H01L51/50H01L51/56B82Y20/00B82Y30/00
CPCC09K11/025B82Y20/00B82Y30/00H10K50/115H10K71/00
Inventor 宁志军姜显园尚跃群
Owner SHANGHAI TECH UNIV
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