Optical conversion member, backlight unit, and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9778509-B2
Application number	US-201615165453-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	Nov 28, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

One embodiment of the present invention relates to an optical conversion member including an optical conversion layer containing a quantum dot emitting fluorescent light which is excited by incident excitation light, in which the optical conversion layer contains a quantum dot and polyorganosilsesquioxane, and an adjacent inorganic layer is directly in contact with the optical conversion layer.

First claim

What is claimed is:

1. An optical conversion member, comprising:
an optical conversion layer containing a quantum dot emitting fluorescent light which is excited by incident excitation light,
wherein the optical conversion layer contains a quantum dot and polyorganosilsesquioxane,
wherein an adjacent inorganic layer is directly in contact with the optical conversion layer, and
wherein the optical conversion layer is a cured material layer of a curable composition which contains a quantum dot and a polymerizable silsesquioxane compound.

2. The optical conversion member according to claim 1 ,
wherein the adjacent inorganic layer is disposed on both surfaces of the optical conversion layer.

3. The optical conversion member according to claim 1 ,
wherein the adjacent inorganic layer is selected from the group consisting of an inorganic nitride layer and an inorganic oxide layer.

4. The optical conversion member according to claim 1 ,
wherein the adjacent inorganic layer is a silicon-containing layer.

5. The optical conversion member according to claim 1 ,
wherein the polyorganosilsesquioxane has a basket type structure or an incomplete basket type structure.

6. The optical conversion member according to claim 1 ,
wherein the quantum dot is at least one selected from the group consisting of a quantum dot A having a light emission center wavelength in a wavelength range of 600 nm to 680 nm, a quantum dot B having a light emission center wavelength in a wavelength range of 500 nm to 600 nm, and a quantum dot C having a light emission center wavelength in a wavelength range of 400 nm to 500 nm.

7. A backlight unit, comprising at least:
the optical conversion member according to claim 1 ; and
a light source.

8. The backlight unit according to claim 7 , which emits blue light which has a light emission center wavelength in a wavelength range of 430 nm to 480 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm, green light which has a light emission center wavelength in a wavelength range of 500 nm to 600 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm, and red light which has a light emission center wavelength in a wavelength range of 600 nm to 680 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm.

9. The backlight unit according to claim 7 ,
wherein the light source has a light emission center wavelength in a wavelength range of 430 nm to 480 nm.

10. The backlight unit according to claim 7 , further comprising:
a light guide plate,
wherein the optical conversion member is disposed on a path of light exiting from the light guide plate.

11. The backlight unit according to claim 7 , further comprising:
a light guide plate,
wherein the optical conversion member is disposed between the light guide plate and the light source.

12. A liquid crystal display device, comprising at least:
the backlight unit according to claim 7 ; and
a liquid crystal cell.

Assignees

• Fujifilm Corp

Inventors

• Ishikawa Hiroyuki

Classifications

• B82Y30/00 Primary

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• G02B6/0026

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title