Method for preparing light conversion composite, light conversion film, backlight unit and display device having the same

A composite material and light conversion film technology, which is applied in the field of light conversion composite materials and its preparation, can solve the problems of QD degradation and QD luminous efficiency deterioration, etc.

Inactive Publication Date: 2016-12-07
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since QDs are easily degraded at high temperature, the luminous efficiency of QDs deteriorates

Method used

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  • Method for preparing light conversion composite, light conversion film, backlight unit and display device having the same
  • Method for preparing light conversion composite, light conversion film, backlight unit and display device having the same
  • Method for preparing light conversion composite, light conversion film, backlight unit and display device having the same

Examples

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preparation example Construction

[0033] The method for preparing a light conversion composite material of an embodiment includes: preparing quantum dot-polymer beads; mixing the quantum dot-polymer beads with a matrix resin to form a mixed solution; and curing the mixed solution. Here, quantum dot-polymer beads were prepared by using a solvent evaporation method. According to the present embodiment, when the quantum dot-polymer beads are prepared using the solvent evaporation method, since the quantum dot-polymer beads are prepared without a high-temperature process, it is possible to prevent the quantum dots from deteriorating during the high-temperature process.

[0034] Next, figure 1 is a diagram illustrating a method of producing a light conversion composite material according to an embodiment. In the following, each process will refer to figure 1 for a more detailed description. First, in operation S1, a polymer and a first solvent are mixed with each other to form a polymer dispersion.

[0035] Her...

preparation example 1

[0119] Preparation Example 1: Quantum dot-polymer beads (I)

[0120] The number average molecular weight is about 28,000 g / mol and the solubility parameter is about 22 MPa 1 / 2 The partially oxidized polyester was dissolved in chloroform to prepare a polymer dispersion. The polymer dispersion contained about 25% polyester by weight. The solvent of the ZnCdSe / ZnS quantum dot solution dissolved in toluene was used instead of chloroform to prepare a quantum dot dispersion (70 mg / mL). The quantum dot dispersion is added to the polymer dispersion, and the mixture is stirred to form a quantum dot-polymer mixture. Here, the polymer dispersion and the quantum dot dispersion were mixed with each other such that the quantum dots in the quantum dot-polymer mixture had a content of about 0.5% by weight.

[0121] Polyvinyl alcohol was dissolved in water to form a 1% by weight dispersant solution. After that, about 10 g of the dispersant solution and about 2 g of the quantum dot-polymer ...

preparation example 2

[0125] Preparation Example 2: Quantum dot-polymer beads (II)

[0126] Except using a solubility parameter of about 21.1MPa 1 / 2 Ethylcellulose resin (manufacturer: Sigma-Aldrich) was used instead of polyester and the polymer dispersion and quantum dot dispersion were mixed with each other so that the quantum dots in the quantum dot-polymer mixture had a content of about 1% by weight Otherwise, the same method as in Preparation Example 1 was carried out, thereby preparing quantum dot-polymer beads (II).

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Abstract

A light conversion composite including a matrix resin and quantum dot-polymer beads dispersed within the matrix resin. The light conversion composite has a wave number q of 0.0056 angstrom-1 to 0.045 angstrom-1 at a peak point in a scattering intensity graph according to wave numbers measured by using small angle X-ray scattering.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2014-0175301 filed on December 8, 2014, which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to a light-converting composite material and a preparation method thereof, and more particularly, to the following light-conversion composite material for preparing A low-deterioration light conversion film at the edge in a humid environment. Background technique [0004] Liquid crystal display (LCD), plasma display panel device (PDP), electroluminescence display (ELD) and field emission display (FED) etc. have appeared as flat panel display (FPD), and flat panel display (FPD) is as the existing cathode ray tube ( CRT) with advantages such as thinness, light weight and low power consumption. [0005] Among them, LCD is in focus as a next-generation high-tech display device due to low power cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V7/05G02F1/13357
CPCC09K11/883F21Y2115/10F21K9/64H01L33/50H05B33/20C08J5/18G02B5/00G02F1/1335B32B27/38B32B2264/0278B32B2264/10B32B2307/422B32B2457/20
Inventor 成镇宇吴珍穆张东善
Owner LG ELECTRONICS INC
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