Color conversion sheet, light source unit including the same, display, and lighting apparatus

Patent metadata

Field	Value
Publication number	US-10604697-B2
Application number	US-201716076415-A
Country	US
Kind code	B2
Filing date	Feb 8, 2017
Priority date	Feb 19, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A color conversion sheet converts incident light into light with a wavelength longer than that of the incident light. The color conversion sheet includes the following layer (A) and layer (B):
the layer (A): a layer containing an organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and the layer (B): a layer containing an organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin.

First claim

The invention claimed is:

1. A color conversion sheet that converts incident light into light with a wavelength longer than that of the incident light, the color conversion sheet comprising the following layer (A) and layer (B):
the layer (A): a layer containing an organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and
the layer (B): a layer containing an organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin,
wherein SP A ≤SP B where SP values as solubility parameters of the binder resin contained in the layer (A) and the binder resin contained in the layer (B) are SP A (cal/cm 3 ) 0.5 and SP B (cal/cm 3 ) 0.5 , respectively.

2. The color conversion sheet according to claim 1 , wherein SP B ≥10.0 where a SP value as a solubility parameter of the binder resin contained in the layer (B) is SP B (cal/cm 3 ) 0.5 .

3. The color conversion sheet according to claim 1 , wherein a content w a of the organic light-emitting material (a) in the layer (A) and a content w b of the organic light-emitting material (b) in the layer (B) have a relation of w a ≥w b .

4. The color conversion sheet according to claim 1 , further comprising a light extraction layer between the layer (A) and the layer (B).

5. A light source unit comprising:
a light source; and
the color conversion sheet according to claim 1 .

6. The light source unit according to claim 5 , wherein an arrangement of the light source and the following layer (A) and layer (B) included in the color conversion sheet is an arrangement of the light source, the layer (A), and the layer (B) in this order:
the layer (A): a layer containing the organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and
the layer (B): a layer containing the organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin.

7. A display or lighting apparatus comprising the light source unit according to claim 5 .

8. A color conversion sheet that converts incident light into light with a wavelength longer than that of the incident light, the color conversion sheet comprising the following layer (A) and layer (B):
the layer (A): a layer containing an organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and
the layer (B): a layer containing an organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin, wherein
at least one of the organic light-emitting material (a) and the organic light-emitting material (b) is a compound represented by General Formula (1):

where X is C—R 7 or N; R 1 to R 9 are the same as or different from each other and are selected from hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxy group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, halogen, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, a phosphine oxide group, and a condensed ring and an aliphatic ring formed between adjacent substituents.

9. The color conversion sheet according to claim 8 , wherein the binder resin contained in the layer (A) and the binder resin contained in the layer (B) are different from each other.

10. The color conversion sheet according to claim 8 , wherein SP B ≥10.0 where a SP value as a solubility parameter of the binder resin contained in the layer (B) is SP B (cal/cm 3 ) 0.5 .

11. The color conversion sheet according to claim 8 , wherein a content w a of the organic light-emitting material (a) in the layer (A) and a content w b of the organic light-emitting material (b) in the layer (B) have a relation of w a ≥w b .

12. The color conversion sheet according to claim 8 , further comprising a light extraction layer between the layer (A) and the layer (B).

13. A light source unit comprising:
a light source; and
the color conversion sheet according to claim 8 .

14. The light source unit according to claim 13 , wherein an arrangement of the light source and the following layer (A) and layer (B) included in the color conversion sheet is an arrangement of the light source, the layer (A), and the layer (B) in this order:
the layer (A): a layer containing the organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and
the layer (B): a layer containing the organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin.

15. A display or lighting apparatus comprising the light source unit according to claim 13 .

16. A color conversion sheet that converts incident light into light with a wavelength longer than that of the incident light, the color conversion sheet comprising the following layer (A) and layer (B):
the layer (A): a layer containing an organic light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less and a binder resin; and
the layer (B): a layer containing an organic light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being excited by either or both of excitation light in a wavelength range of 400 nm or more and 500 nm or less and light emission from the organic light-emitting material (a) and a binder resin, wherein
the layer (A) further contains an organic light-emitting material (c) that exhibits light emission with a peak wavelength observed in a region of 580 nm or more and 750 nm or less by being exci

Assignees

• Toray Industries

Inventors

• Sakaino Hirotoshi

Classifications

• C09K2211/1033

  with oxygen · CPC title

• C09K2211/185

  of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• C09K2211/186

  of the light metals other than alkali metals and alkaline earth metals, i.e. Be, Al or Mg · CPC title