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Quantum dot/polyurethane nano crystal complex and preparation method thereof as well as colorful conversion film

A color conversion film and nanocrystal technology, applied in the direction of photosensitive materials for opto-mechanical equipment, etc., can solve the problems of low color gamut, not bright and realistic colors, low light source utilization, etc., and achieve high luminous efficiency and saturation. High, pure color effect

Inactive Publication Date: 2014-04-09
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a quantum dot / polyurethane nanocrystal composite and its preparation method and color conversion film, aiming at solving the problem of using white light-emitting diode backlights in combination with ordinary color substrates in existing liquid crystal displays. To form a color display, the color gamut of the picture is relatively low, the color is not bright enough and real, and the light source utilization rate is low.

Method used

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  • Quantum dot/polyurethane nano crystal complex and preparation method thereof as well as colorful conversion film

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preparation example Construction

[0065] The quantum dot / polyurethane nanocrystal composite prepared by the above method increases the interaction between the quantum dot and the photoresist, overcomes the problems that the surface atoms of the quantum dot have high activity, is extremely unstable, and is easy to agglomerate. Better disperse in the photoresist to play the light-emitting properties of quantum dots. Therefore, the quantum dot / polyurethane nanocrystal composite can be used to prepare a color conversion film, and the preparation method of the color conversion film comprises the following steps:

[0066] i) Disperse the quantum dot / ionic polyurethane nanocrystal composite in the photoresist, and coat it on the transparent substrate of the prepared black matrix to form a layer of photoresist film with dispersed quantum dots; ii) through the mask film exposing the photoresist film; iii) developing the exposed photoresist film.

[0067] Among them, the main components of the so-called photoresist are...

Embodiment 1

[0072] Example 1: Preparation of quantum dot / polyurethane nanocrystal composite by solution blending method

[0073] Under a nitrogen atmosphere, 10mol 2,4-toluene diisocyanate, 6mol polyethylene glycol PEG400, and 5mol dibromoneopentyl glycol were prepared anyway to obtain a polyurethane containing bromine atoms in the side chain. Further, 5mol imidazole and side chains containing bromine atoms The polyurethane was quaternized to prepare imidazolium cationic polyurethane, which was dissolved in methyl ethyl ketone hot liquid to obtain a concentration of 0.1mg mL -1 Methyl ethyl ketone solution of ionic polyurethane, thioglycolic acid ligand-stabilized CdTe / ZnS quantum dots were dissolved in acetone solution to prepare 0.02mg mL -1 quantum dot nanocrystal solution. Under mechanical stirring, mix 10mL imidazolium cationic polyurethane solution with 10mL quantum dot solution, continue mechanical stirring for 0.5h, then add imidazolium cationic polyurethane precipitant methanol ...

Embodiment 2

[0076] Embodiment 2: Preparation of quantum dot / polyurethane nanocrystal composite by melt blending method

[0077] Under nitrogen atmosphere, 15mol 1,6-hexyl diisocyanate, 7mol unsaturated polyester diol 191#, 8mol 2,2-dimethylol propionic acid were prepared anyway to obtain polyurethane containing -COOH group in the side chain, and further , 8mol triethylamine reacted with polyurethane containing -COOH group in the side chain to produce an acid addition salt to prepare -COO-anionic polyurethane. Take 5g and heat it above the melting temperature. Under mechanical stirring, mix 1g of mercaptoethylene Disperse the amine-stabilized CdSe / CdS quantum dot powder into the ionic polyurethane in the molten state, continue mechanical stirring for 2 hours, and cool down to room temperature naturally to obtain the CdSe / CdS quantum dot / anionic polyurethane nanocrystal composite, which is placed in a desiccator Keep it in use (the whole composite process is completed under the protection o...

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Abstract

The invention discloses a quantum dot / polyurethane nano crystal complex and a preparation method thereof as well as a colorful conversion film. The quantum dot / polyurethane nano crystal complex is prepared by electrostatic interaction effects of ion type polyurethane and a quantum dot with opposite charges. The colorful conversion film is prepared by taking the quantum dot / polyurethane nano crystal complex as a raw material and replacing the quantum dot by a traditional pigment to be dispersed into a photoresist to prepare the colorful conversion film, wherein the polyurethane in the quantum dot / polyurethane nano crystal complex has the effect of smoothly dispersing the quantum dot into the photoresist to ensure that the quantum dot can express the luminous effect. The colorful conversion film can be used for enabling the light emitted by a display device to be pure; the saturation degree is high; the energy of a backlight source is sufficiently utilized and the luminous efficiency is high.

Description

technical field [0001] The invention relates to the technical field of liquid crystal displays, in particular to a quantum dot / polyurethane nano crystal compound, a preparation method and a color conversion film. Background technique [0002] A liquid crystal display (Liquid Crystal Display, LCD) has the advantages of small size, light weight, long service life, energy saving and environmental protection, and is currently a mainstream product among display devices. Liquid crystal displays usually use a white light emitting diode (Light Emitting Diode, LED) backlight to form a color display with an ordinary color substrate. The backlight is generally a white backlight. The color filter substrate is composed of a substrate, a color filter layer and a black matrix on the substrate. After the white light backlight is filtered by the red, green and blue primary colors (R / G / B) of the color filter layer in the color filter substrate, it not only obtains Monochromatic light also co...

Claims

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Application Information

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IPC IPC(8): C08L75/14C08K3/10C08K3/30C08K3/28G03F7/004
Inventor 李雪付东谢相伟孙闲文濮怡莹
Owner TCL CORPORATION
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