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Method for measuring content of quantum dot surface ligand and quantum dot ink preparing method

A technology of surface ligands and measurement methods, which is applied in the direction of chemical analysis by titration and electrochemical variables of materials, etc. It can solve the problems of low pixel resolution, uneven panel quality, difficult dissolution of quantum dots, etc., and achieve reliable quality assurance , strong operability and simple method

Active Publication Date: 2019-06-25
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are too few ligands on the surface of the quantum dots, the quantum dots are not easy to dissolve in the ink solvent, so inkjet printing cannot be performed
If the surface ligand exchange rate of different batches of quantum dots is different, the solubility, drying rate and coffee ring effect of the quantum dot ink will also be different, which will affect the quality of the light-emitting layer film, which directly leads to the printing of the panel. Uneven quality, low pixel resolution, turn-on voltage, uneven photoelectric efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Determine the relative content of the characteristic element S in the surface ligand of the standard particle CdSe quantum dot (the surface ligand is decylthiol) as ω 1 .

[0059] ① Preparation of 0.0l mol / L silver nitrate alcohol standard titration solution, dissolve 1.7 g silver nitrate in 10 mL deionized water in a 1000 mL volumetric flask, and dilute to the mark with isopropanol;

[0060] ②Preparation of alkaline titration solvent, absorb 1.6 g of anhydrous sodium acetate and dissolve it in 25 mL of anaerobic water, and then inject it into 975 mL of isopropanol;

[0061] ③ Preparation of silver-silver sulfide electrode, 1) Polish the silver terminal of the silver electrode with sandpaper. 2) Immerse the silver terminal of the polished silver electrode in 100 mL of alkaline titration solvent containing 7 mL of 1 wt% sodium sulfide solution. 3) Under the condition of stirring, slowly add 80 mL, 0.01 mol / L silver nitrate alcohol standard titration solution from th...

Embodiment 2

[0065] 1. Determine the standard particle CeO 2 The relative content of the characteristic element N in the surface ligand of the quantum dot (the surface ligand is n-hexylamine) is ω 1 .

[0066] ①Preparation of 0.1 mol / L perchloric acid standard titration solution, take 8.5mL of perchloric acid (70%) in a 1000mL volumetric flask, add 100 mL of isopropanol to dissolve, add dioxane to dilute to the mark ;

[0067] ② For sample testing, accurately weigh 30 mg of sample particles and place them in a 250 mL Erlenmeyer flask or a matching titration cup for an instrument with a corresponding range, add 50 mL of isopropanol, and shake to disperse the sample particles in the solvent. Set potential preset value dE(set) = 16mV, minimum titrant addition dV(min) = 0.02 mL, maximum titrant addition dV(max) = 0.2 mL, potential balance allowable value dE = 5 mV, potential value record Time dt = 0.5 s, minimum potential value recording time dt(min) = 1 s, maximum potential value recording...

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PUM

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Abstract

The invention provides a method for measuring the content of quantum dot surface ligand and a quantum dot ink preparing method. When the method is used for preparing quantum dot ink, the uniformity ofquantum dot ink quality can be ensured, the consistency of the solubility, drying rates and coffee ring effects of different batches of quantum dot ink is guaranteed, and the pixel resolution and uniformity of the lighting voltages and photoelectric efficiency of the quantum dot display panel are improved.

Description

technical field [0001] The invention relates to the technical field of quantum dot inks, in particular to a method for measuring ligand content on the surface of quantum dots and a preparation method for quantum dot inks. Background technique [0002] Quantum dots refer to semiconductor nanocrystals whose geometric size is smaller than their excitonic Bohr radius. Quantum dots have great potential applications in the fields of biomedicine, environmental energy, and lighting display due to their excellent optical properties such as absorption bandwidth, narrow fluorescence emission band, high quantum efficiency, and good photostability. Compared with liquid crystal display and organic light-emitting display, the display technology based on quantum dot luminescence has been highly valued by the display industry in recent years. Quantum dot luminescence has a wider color gamut, higher color purity, simpler structure, and higher stability. It is a new generation display technol...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N31/16
Inventor 叶炜浩覃辉军杨一行
Owner TCL CORPORATION
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