Color conversion film and back light unit and display apparatus comprising the same

Patent metadata

Field	Value
Publication number	US-2016223162-A1
Application number	US-201615010482-A
Country	US
Kind code	A1
Filing date	Jan 29, 2016
Priority date	Jan 31, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

The invention described in the present specification relates to a color conversion film including a resin matrix; and an organic fluorescent substance, wherein the organic fluorescent substance includes a first fluorescent substance and a second fluorescent substance, and the first fluorescent substance has a light emission peak with FWHM of 60 nm or less and a Stokes shift of 30 nm or less when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution, a method for preparing the same, and a back light unit including the color conversion film.

First claim

1 . A color conversion film comprising:
a resin matrix; and an organic fluorescent substance dispersed in the resin matrix, wherein the organic fluorescent substance includes a first fluorescent substance and a second fluorescent substance, and the first fluorescent substance has a light emission peak with FWHM of 60 nm or less and a Stokes shift of 30 nm or less when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

2 . The color conversion film of claim 1 , wherein the first fluorescent substance has a maximum light emission wavelength in a 515 nm to 555 nm range when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution, and the second fluorescent substance has a maximum light emission wavelength in a 490 nm to 540 nm range when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

3 . The color conversion film of claim 1 , which has a maximum light emission wavelength in a 515 nm to 555 nm range when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

4 . The color conversion film of claim 1 , wherein the first fluorescent substance and the second fluorescent substance have a different FWHM at light emission peak in a film state when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

5 . The color conversion film of claim 1 , wherein the first fluorescent substance receives at least some of excited electrons of the second fluorescent substance, or at least some of absorption wavelengths of the first fluorescent substance are overlapped with at least some of light emission wavelengths of the second fluorescent substance.

6 . The color conversion film of claim 1 , wherein the light emission peak with FWHM of the first fluorescent substance in a film state when irradiating light is narrower than the light emission peak with FWHM of the second fluorescent substance in a film state when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

7 . The color conversion film of claim 1 , wherein the light emission wavelength of the second fluorescent substance in a film state includes a maximum absorption wavelength of the first fluorescent substance in a film state when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.

8 . The color conversion film of claim 1 , wherein the maximum absorption wavelength of the first fluorescent substance is present in 450 nm to 515 nm.

9 . The color conversion film of claim 1 , wherein the light emission wavelength of the second fluorescent substance includes at least some from 450 nm to 515 nm.

10 . The color conversion film of claim 1 , wherein the maximum light emission wavelength of the second fluorescent substance is present in 480 nm to 540 nm.

11 . A method for preparing the color conversion film of claim 1 , the method comprising:
coating a resin solution in which an organic fluorescent substance including a first fluorescent substance and a second fluorescent substance that are different from each other is dissolved on a substrate; and drying the resin solution coated on the substrate.

12 . The method for preparing the color conversion film of claim 1 , the method comprising extruding an organic fluorescent substance including a first fluorescent substance and a second fluorescent substance that are different from each other together with a resin.

13 . A back light unit including the color conversion film of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Shin Dong Mok
• Ahn Byeong In
• Kim Nari
• Lee Hoyong
• Kim Ji Ho
• Seo Joo Yeon

Classifications

• F21V9/16 Primary

  Mechanical Engineering · mapped topic

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02F1/133624

  characterised by their spectral emissions · CPC title

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title