Color conversion film, method for producing same, back-light unit and display apparatus

一种色彩转换、背光单元的技术，应用在化学仪器和方法、光学、滤光片等方向，能够解决使用限制等问题，达到厚度变化最小化、增加色域、优异色域和亮度特性的效果

Active Publication Date: 2017-08-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cadmium-based quantum dots have safety issues, such as usage restrictions, and therefore, interest in manufacturing backlights using quantum dots that do not contain cadmium, which are relatively free from safety issues, has been increasing

Method used

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  • Color conversion film, method for producing same, back-light unit and display apparatus
  • Color conversion film, method for producing same, back-light unit and display apparatus
  • Color conversion film, method for producing same, back-light unit and display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] By using the green organic fluorescent substance of the following structural formula (in the film state, FWHM=45nm, Qy=95%, the absorption coefficient=80,000M at the maximum absorption wavelength -1 cm -1 ) was dissolved in DMF solvent to prepare the first solution.

[0092]

[0093] A second solution was prepared by dissolving PMMA thermoplastic resin in DMF solvent.

[0094] The first solution was mixed with the second solution so that the amount of the organic fluorescent substance became 0.5 parts by weight based on 100 parts by weight of PMMA, and uniformly mixed. The solid content in the mixed solution was 20% by weight, and the viscosity was 200 cps. This solution was coated on a PET substrate, and the resultant was dried to prepare a color conversion film.

[0095] The luminance spectrum of the prepared color conversion film was measured using a spectroradiometer (TOPCON Corporation SR series). Specifically, the prepared color conversion film was placed o...

Embodiment 2

[0099] The color conversion film was prepared in the same manner as in Example 1, except that the red organic fluorescent substance of the following structure was used (in the film state, FWHM=49nm, quantum efficiency was 93%, and the absorption coefficient at the maximum absorption wavelength was 185,000 m -1 cm -1 ) to replace the green organic fluorescent substance used in Example 1 as the organic fluorescent substance.

[0100]

[0101] The color conversion film prepared above and the color conversion film prepared in Example 1 were laminated, and the luminance spectrum was measured in the same manner as in Example 1, and the results are shown in image 3 middle. image 3 The unit of the vertical axis in is W / sr / m 2 .

[0102]In addition, color gamuts of spectra passing through the color filters were each evaluated in CIE 1931 color space and CIE 1976 Uniform Color Scale (UCS) color space, and the results are shown in Table 1 below.

Embodiment 3

[0104] Prepare the green color conversion film in the same manner as in Example 1, except that the green organic fluorescent substance of the following structure is used (in the film state, FWHM=40nm, the quantum efficiency is 98%, and the absorption coefficient is 75,000M -1 cm -1 ) to replace the green organic fluorescent substance used in Example 1. The prepared green color conversion film was laminated with the red color conversion film prepared in Example 2, and the color gamut was evaluated in the same manner as in Example 2.

[0105]

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Abstract

The present invention relates to a color-conversion film, a method for producing same, and a back-light unit comprising the color-conversion film, the color-conversion film comprising: a resin matrix; and an organic fluorescent substance dispersed within the resin matrix and absorbing blue or green light to emit light of a different wavelength from the absorbed light, wherein the resin matrix comprises a thermoplastic resin, and the color-conversion film has: a light-emission peak at 450 nm; a half-width of 40 nm; a half-width of 60 nm or less at the light emission peak when irradiated with light having a mono-modal distribution of luminous intensity; a quantum efficiency of 80% or greater; and an absorption coefficient of 30,000 M-1cm-1 or greater at the maximum absorption wavelength.

Description

technical field [0001] The present application relates to color conversion films and methods of making the same. Furthermore, the present application relates to a backlight unit and a display device including the color conversion film. [0002] This application claims priority and benefit from Korean Patent Application No. 10-2015-0015707 filed with the Korean Intellectual Property Office on January 31, 2015, the entire contents of which are incorporated herein by reference. Background technique [0003] As large-size TVs become more common, TVs also become high-definition, thinner and more powerful. High-performance and high-definition OLED TVs still have price competitiveness issues, and the real market for OLED TVs has not yet started. Therefore, efforts have been continuously made to ensure that OLEDs have LCD-like advantages. [0004] As part of this effort, many quantum dot-related technologies and prototypes have recently been incorporated. However, cadmium-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L29/04C08L25/12C08K5/55C09K11/06G02B5/20
CPCC08J5/18C08K5/55C09K11/06G02B5/20C08J2329/04C08J2333/12C08J2325/12C09K2211/1096C08L33/12C08L29/04C08L25/12C09K11/025C09K2211/1007C09K2211/1011C09K2211/1055G02F1/133624G02F1/133614G02F1/133621
Inventor 申东穆孙世焕李浩勇安秉寅申斗铉金娜丽金志浩徐周延
Owner LG CHEM LTD
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