Nanophosphor-attached inorganic particles and wavelength conversion member

Patent metadata

Field	Value
Publication number	US-11655415-B2
Application number	US-201816605510-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 19, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

Provided are nanophosphor-attached inorganic particles that can suppress the degradation of the nanophosphor when sealed in glass, and a wavelength conversion member using the nanophosphor-attached inorganic particles. The nanophosphor-attached inorganic particle 10 include: inorganic particles 1 having an average particle diameter of 1 μm or more; and a nanophosphor 2 attached to surfaces of the inorganic particles 1.

First claim

The invention claimed is:

1. A wavelength conversion member comprising:
nanophosphor-attached inorganic particles dispersed in a glass matrix; wherein
the nanophosphor-attached inorganic particles include:
inorganic particles having an average particle diameter of 1 μm or more, the inorganic particles being ceramic particles of oxides; and
a nanophosphor attached to outermost surfaces of the inorganic particles;

gaps are provided between the inorganic particles and the glass matrix, and the nanophosphor is located in the gaps; and
the inorganic particles are non-porous.

2. The wavelength conversion member according to claim 1 , wherein the inorganic particles are made of at least one material selected from the group consisting of SiO 2 , Al 2 O 3 , ZrO 2 , TiO 2 , MgO, ZnO, and CeO.

3. The wavelength conversion member according to claim 1 , wherein the inorganic particles have a spherical shape, a crushed shape, an acicular shape, a flaky shape or a hollow bead-like shape.

4. The wavelength conversion member according to claim 1 , wherein the inorganic particles are secondary particles.

5. The wavelength conversion member according to claim 1 , wherein the nanophosphor has an average particle diameter of 1 to 100 nm.

6. The wavelength conversion member according to claim 1 , wherein the nanophosphor is a quantum dot phosphor made of at least one material selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, InP, GaN, GaAs, GaP, AIN, AIP, AlSb, InN, InAs, and InSb or a composite of two or more materials selected from the group.

7. The wavelength conversion member according to claim 1 , further comprising coating layers on surfaces of the nanophosphor-attached inorganic particles.

8. The wavelength conversion member according to claim 1 , wherein the glass matrix has a deformation temperature of 380° C. or below.

9. The wavelength conversion member according to claim 1 , being formed of a sintered body of the nanophosphor-attached inorganic particles and a glass powder.

10. The wavelength conversion member according to claim 1 , wherein the glass matrix is made of a SnO—P 2 O 5 -based glass or a SnO—P 2 O 5 -F-based glass.

11. A method for producing the wavelength conversion member according to claim 1 , the method comprising the steps of:
mixing a liquid comprising a nanophosphor dispersed in a dispersion medium with inorganic particles;
producing nanophosphor-attached inorganic particles by removing the dispersion medium in the liquid; and
mixing the nanophosphor-attached inorganic particles with a glass powder and then firing the nanophosphor-attached inorganic particles and the glass powder mixed together.

12. The method for producing a wavelength conversion member according to claim 11 , wherein the glass powder has an average particle diameter of 0.1 to 100 μm.

13. The wavelength conversion member according to claim 1 , wherein the average particle diameter of the inorganic particles is 5 μm or more and 200 μm or less.

14. The wavelength conversion member according to claim 1 , wherein a content of the inorganic particles in the wavelength conversion member is, in terms of % by mass, 5% to 20%.

Assignees

• Nippon Electric Glass Co

Inventors

• Ando Tamio
• Furuyama Tadahito
• Fujita Shunsuke

Classifications

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• H10H20/8511

  characterised by their material, e.g. binder · CPC title

• C09K11/75

  containing antimony · CPC title

• C09K11/08

  containing inorganic luminescent materials · CPC title

• C09K11/64

  containing aluminium · CPC title