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Zinc oxide nanocrystal, preparation method thereof, zinc oxide nanocrystal ink and electro-luminescence device

A technology of zinc oxide nanocrystals and inks, applied in nano optics, electrical solid devices, chemical instruments and methods, etc., can solve problems such as surface defects of zinc oxide nanocrystals, reduce electron mobility, alleviate imbalance problems, The effect of improving electrical properties

Active Publication Date: 2017-05-10
NANJING TECH CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of zinc oxide nanocrystal, its preparation method, zinc oxide nanocrystal ink and electroluminescence device, to solve the problem of the surface defect of zinc oxide nanocrystal in the prior art

Method used

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  • Zinc oxide nanocrystal, preparation method thereof, zinc oxide nanocrystal ink and electro-luminescence device

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preparation example Construction

[0027] In another typical embodiment of the present application, a method for preparing the above-mentioned zinc oxide nanocrystals is provided. The preparation method includes: step S1, preparing a solution of initial zinc oxide nanocrystals by a solution method, and the initial zinc oxide nanocrystals Carboxylate surface ligands; step S2, reacting the solution with a sulfur precursor at 50-200°C to form zinc oxide nanocrystals, the sulfur precursor being S Solution, wherein, R1, R2 and R3 are each independently selected from C 1～10 Any one of the alkyl groups, and the pH value of the reaction system is controlled between 7 and 10 during the reaction

[0028] Using the above method, ligand modification is carried out on the initial zinc oxide nanocrystals with carboxylate surface ligands prepared by the solution method of the prior art, and the sulfur precursor S is utilized solution (i.e. sulfur dissolved in solution) reacts with zinc ions on the surface to form a layer...

Embodiment 1

[0044] Synthesis of initial ZnO nanocrystals:

[0045] Preparation of solution A: Add 3 mmol of zinc acetate dihydrate and 30 ml of DMSO (dimethyl sulfoxide) into a 100 ml three-neck flask, heat in a water bath at 30° C. and stir magnetically.

[0046] Prepare solution B: take another small beaker, add 5mmolTMAH (tetramethylammonium hydroxide) and 10ml ethanol, shake well and mix well, then seal it with a sealing film.

[0047] Add solution B dropwise to solution A (completed in about 10 minutes), then continue magnetic stirring, and stir for 1 hour in a water bath at 30°C.

[0048] Dissolve the initial zinc oxide nanocrystals obtained after purification of the mixed solution after the reaction in ethylene glycol to form an ethylene glycol solution of initial zinc oxide nanocrystals. The specific process is: take 5ml of the mixed solution in a centrifuge tube, add 5ml Ethyl acetate, centrifuge at 3000rpm+3min, pour off the supernatant and add 3ml ethylene glycol to dissolve. ...

Embodiment 2

[0054] The difference from Example 1 is that zinc oxide nanocrystals are prepared: add 10 mmol S-TBP (a solution of sulfur dissolved in tributylphosphine) solution to the ethylene glycol solution of initial zinc oxide nanocrystals and react at 100° C. 30min, the product system containing the zinc oxide nanocrystals.

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Abstract

The invention provides a zinc oxide nanocrystal, a preparation method thereof, a zinc oxide nanocrystal ink and an electro-luminescence device. The zinc oxide nanocrystal comprises surface ligands, which are S-P-R1, R2, R3, wherein R1, R2 and R3 are separately independently selected from any of alkyls of C1-10. The surface ligands of the zinc oxide nanocrystal together with the zinc oxide nanocrystal can form a layer of coating ZnS, which can not only weaken defect luminescence mainly led to by dangling bonds of Zn on the surface of the zinc oxide nanocrystal, but also conveniently adjust the surface ligands of the zinc oxide nanocrystal by adjusting the variety of sulfur precursors to further adjust the electronic mobility of ZnO. The electrical property of zinc oxide nanocrystal film formed by the zinc oxide nanocrystal is improved, and further the problem of defect luminescence of quantum dot light emitting diodes can be solved.

Description

technical field [0001] The invention relates to the field of quantum dot materials, in particular to a zinc oxide nanocrystal, its preparation method, zinc oxide nanocrystal ink and an electroluminescence device. Background technique [0002] With the continuous advancement of technology, quantum dot light-emitting diodes (QLEDs) have gradually emerged due to their unique advantages, and have gradually become a new generation of products replacing OLEDs (organic light-emitting diodes). The electron transport layer of quantum dot light-emitting diodes (QLED) can be prepared by zinc oxide, but this technology has not been mature enough until Qian Lei published an article in Nano Today ((2010) 5,384~389) in 2010, which will be based on the solution method low temperature ( 30°C) synthesized zinc oxide (ZnO) nanocrystals are used in the electron transport layer of quantum dot light-emitting diodes (QLED). This method mainly uses zinc acetate dihydrate (Zn(Ac)2 2H 2 O) and tetra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/06B82Y20/00B82Y40/00C09D11/30C09D11/38C09D11/03H01L51/54
CPCC09D11/03C09D11/30C09D11/38C09K11/02C09K11/06B82Y20/00B82Y40/00C09K2211/188H10K85/381H10K50/115H10K50/16
Inventor 谢松均何明明
Owner NANJING TECH CORP LTD
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