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Optical film of liquid crystal/polymer composite material containing quantum dots and preparation method thereof

A technology of optical thin films and composite materials, applied in the direction of liquid crystal materials, chemical instruments and methods, luminescent materials, etc., which can solve the problems of unfavorable preparation, limited refraction of blue light, increased preparation procedures and processes, etc.

Inactive Publication Date: 2019-05-07
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The quantum dot film of this multilayer structure not only increases the thickness of the display, which is not conducive to the preparation of light and ultra-thin display products; it also increases the preparation process and technology, which increases the cost of the display; moreover, the surface layer of the quantum dot film structure The micro-nano structure has a limited refraction effect on blue light, which reduces the utilization rate of quantum dot film for blue light

Method used

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  • Optical film of liquid crystal/polymer composite material containing quantum dots and preparation method thereof
  • Optical film of liquid crystal/polymer composite material containing quantum dots and preparation method thereof
  • Optical film of liquid crystal/polymer composite material containing quantum dots and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The red CdSe / ZnS quantum dots used in this example were purchased from Beijing Zhongke Wuyuan Biological Co., Ltd. Its emission peak is located at 610nm, its particle size is 10nm, and it is dispersed in cyclohexane with a mass fraction of 10%.

[0069] This example prepares an optical film containing red CdSe / ZnS quantum dots through the following steps:

[0070] 1. Mix the mixture solution according to the composition described in Table 2;

[0071]

[0072] Table 2. Composition of the components of the mixture used in Example 1

[0073] 2. The mixed solution of sample 1 and sample 2 above was heated to 50° C. under vacuum, and stirred continuously for 1 hour to remove the cyclohexane solvent.

[0074] 3. Place the dispersions of sample 1 and sample 2 obtained in 2 between two films, squeeze them with a roller to form a film, and then use a light intensity of 5mw / cm 2 The ultraviolet light was irradiated on the film for 20 minutes, and the optical films of sample...

Embodiment 2

[0078] The green CdSe / ZnS quantum dots used in this example were purchased from Beijing Zhongke Wuyuan Biological Co., Ltd. Its emission peak is located at 530nm, its particle size is 3nm, and it is dispersed in cyclohexane with a mass fraction of 10%.

[0079] This example prepares an optical film containing green CdSe / ZnS quantum dots through the following steps:

[0080] 1. Mix the mixture solution according to the ratio described in Table 3;

[0081]

[0082]

[0083] Table 3. Composition of the components of the mixture used in Example 2

[0084] 2. The above mixed solution was heated to 50° C. under vacuum and stirred continuously for 1 hour to remove the cyclohexane solvent.

[0085] 3. Place the dispersions of sample 3 and sample 4 obtained in 2 between two films, squeeze them with a roller to form a film, and then use a light intensity of 10mw / cm 2 The ultraviolet light was irradiated on the film for 20 minutes to obtain the optical films of sample 3 and samp...

Embodiment 3

[0089] The green and red CdSe / ZnS quantum dots used in this example were purchased from Beijing Zhongke Wuyuan Biological Co., Ltd. The emission peak of the green quantum dots is at 530nm, and the particle size is 3nm; the emission peak of the red quantum dots is at 610nm, and the particle size is 10nm. All dispersed in cyclohexane, the mass fraction is 10%.

[0090] Mix the above-mentioned dispersion liquid of red quantum dots and green quantum dots according to the mass ratio of 1:9 to obtain a dispersion liquid of red / green quantum dot mixture.

[0091] 1. Mix the mixture solution according to the ratio described in Table 4;

[0092]

[0093]

[0094] Table 4. Composition of the components of the mixture used in Example 3

[0095] 2. Heat the above mixed solution to 50°C under vacuum, and stir continuously for 1 hour to remove the cyclohexane solvent;

[0096] 3. Place the dispersions of sample 5 and sample 6 obtained in 2 between two films, squeeze them with a rol...

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Abstract

The invention discloses a liquid crystal / polymer composite film containing quantum dots and a preparation method thereof. The optical film comprises a high-molecular polymer and quantum dots, whereinthe high-molecular polymer is formed by polymerizing a non-liquid-crystalline polymerization monomer or formed by blend-polymerization of the non-liquid-crystalline polymerization monomer and a liquid-crystalline polymerization monomer. The quantum dots are doped in the liquid crystal / polymer composite material, so that the propagation path of an excitation light source in the film is greatly increased, and the fluorescence intensity of the film is improved; The prepared film has a good application prospect in the fields of display and solid-state lighting, and particularly, the structure ofa backlight module in a liquid crystal display can be effectively simplified.

Description

technical field [0001] The invention belongs to the technical application field of functional liquid crystal materials, and in particular relates to a method for preparing an optical film of a liquid crystal / polymer composite material containing quantum dots. Background technique [0002] Quantum dots are nanoparticles with a stable particle size in the range of 2 to 20nm. Due to the "quantum confinement" effect, this three-dimensional nanoscale nanomaterial exhibits many unique electro-optical properties different from macroscopic materials: such as emission spectrum Continuously adjustable (its emission spectrum range can cover the entire visible light band, even extended to near and mid-infrared regions); high color purity (half-peak width of emission spectrum is lower than 30nm); high stability (higher than organic chromophore ) and other advantages. These characteristics make quantum dots have strong application prospects in the fields of display and solid-state lighti...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F216/12C08F220/20C08F220/18C08K3/30C08J5/18C09K19/38C09K11/88C09K11/02
Inventor 杨槐梁霄陈梅张兰英
Owner PEKING UNIV
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