Dispersion liquid, composition, sealing member, light-emitting device, illumination tool, display device, and method for producing light-emitting device

Patent metadata

Field	Value
Publication number	US-11359072-B2
Application number	US-201816626335-A
Country	US
Kind code	B2
Filing date	Aug 1, 2018
Priority date	Aug 4, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

Provided is a dispersion liquid for sealing a light-emitting element containing metal oxide particles having a refractive index of 1.7 or higher and a surface-modifying material at least partially attached to the metal oxide particles, in which a particle diameter D50 of the metal oxide particles when a cumulative percentage of a scattering intensity distribution obtained by a dynamic light scattering method is 50% is 30 nm or more and 100 nm or less, and a value D50/D90 obtained by dividing the particle diameter D50 of the metal oxide particles when the cumulative percentage of the scattering intensity distribution is 50% by a particle diameter D90 of the metal oxide particles when the cumulative percentage of the scattering intensity distribution is 90% is 0.20 or more.

First claim

The invention claimed is:

1. A dispersion liquid for sealing a light-emitting element, comprising:
metal oxide particles having a refractive index of 1.7 or higher; and
a surface-modifying material at least partially attached to the metal oxide particles,
wherein a particle diameter D50 of the metal oxide particles when a cumulative percentage of a scattering intensity distribution obtained by a dynamic light scattering method is 50% is 30 nm or more and 100 nm or less, and
a value D50/D90 obtained by dividing the particle diameter D50 of the metal oxide particles when the cumulative percentage of the scattering intensity distribution is 50% by a particle diameter D90 of the metal oxide particles when the cumulative percentage of the scattering intensity distribution is 90% is 0.20 or more,
wherein a content of the surface-modifying material not attached to the metal oxide particles is 20% by mass or more and 53% by mass or less with respect to a total content of the metal oxide particles and the surface-modifying material.

2. The dispersion liquid according to claim 1 ,
wherein the metal oxide particles include zirconium oxide particles and/or titanium oxide particles.

3. The dispersion liquid according to claim 1 ,
wherein an average primary particle diameter of the metal oxide particles is 3 nm or more and 20 nm or less.

4. A composition for sealing a light-emitting element which is obtained by mixing the dispersion liquid according to claim 1 and a resin component.

5. A sealing member which is a cured substance of the composition according to claim 4 .

6. A light-emitting device comprising:
the sealing member according to claim 5 ; and
a light-emitting element sealed by the sealing member.

7. An illumination tool comprising:
the light-emitting device according to claim 6 .

8. A display device comprising:
the light-emitting device according to claim 6 .

9. A method for producing a light-emitting device, comprising:
a step of sealing a light-emitting element using the composition according to claim 4 .

10. A method for producing a light-emitting device, comprising:
a step of obtaining a composition by mixing the dispersion liquid according to claim and a resin component; and
a step of sealing a light-emitting element using the composition.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Harada Kenji
• Otsuka Takeshi

Classifications

• H10H20/0362

  of encapsulations · CPC title

• H10H20/854 Primary

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• C09C3/10

  Treatment with macromolecular organic compounds {(C09C3/006 takes precedence)} · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K3/22

  of metals · CPC title