Oxide fluorescent material and light emitting device

Patent metadata

Field	Value
Publication number	US-12557447-B2
Application number	US-202218060395-A
Country	US
Kind code	B2
Filing date	Nov 30, 2022
Priority date	Nov 30, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

To provide an oxide fluorescent material that has a light emission peak wavelength in a wavelength range of from red light to near infrared light. The oxide fluorescent material has a composition encompassed in a compositional formula represented by the following formula (1): (Li1-tM1t)u(Ga1-vM2v)5Ow:Crx,Niy,M3z,  (1) wherein in the formula (1), M1 represents at least one kind of an element selected from the group consisting of Na, K, Rb, and Cs; M2 represents at least one kind of an element selected from the group consisting of B, Al, Sc, In, and a rare earth element; M3 represents at least one kind of an element selected from the group consisting of Si, Ge, Sn, Ti, Zr, Hf, Bi, V, Nb, and Ta; and t, u, v, w, x, y, and z each satisfy 0≤t≤1.0, 0.7≤u≤1.6, 0≤v<1.0, 7.85≤w≤11.5, 0.05≤x≤1.2, 0≤y≤0.5, 0.25<x+y≤1.2, y<x, and 0≤z≤0.5.

First claim

The invention claimed is:

1 . An oxide fluorescent material having a composition encompassed in a compositional formula represented by the following formula (1):
(Li 1-t M 1 t ) u (Ga 1-v M 2 v ) 5 O w :Cr x ,Ni y ,M 3 z   (1)
wherein in the formula (1), M 1 represents at least one kind of an element selected from the group consisting of Na, K, Rb, and Cs; M 2 represents at least one kind of an element selected from the group consisting of B, Al, Sc, In, and a rare earth element; M 3 represents at least one kind of an element selected from the group consisting of Si, Ge, Sn, Ti, Zr, Hf, Bi, V, Nb, and Ta; and t, u, v, w, x, y, and z each satisfy 0≤t≤1.0, 0.7≤u≤1.6, 0≤v≤1.0, 7.85≤w≤11.5, 0.05≤x≤1.2, 0≤y≤0.5, 0.25<x+y≤1.2, y<x, and 0≤z≤0.5.

2 . The oxide fluorescent material according to claim 1 , wherein in the formula (1), x and y satisfy 0<y≤0.5 and 1.5≤x/y≤50.

3 . The oxide fluorescent material according to claim 1 , wherein in the formula (1), x and y satisfy 0.08≤x≤0.8 and 0.001≤y≤0.3.

4 . The oxide fluorescent material according to claim 1 , wherein in the formula (1), x and y satisfy 0.1≤x≤0.5 and 0.005≤y≤0.2.

5 . The oxide fluorescent material according to claim 1 , wherein the oxide fluorescent material has a full width at half maximum of a light emission spectrum having a light emission peak wavelength of 150 nm or more.

6 . The oxide fluorescent material according to claim 1 , wherein the oxide fluorescent material has a light emission peak wavelength in a range of 1,150 nm or more and 1,300 nm or less.

7 . The oxide fluorescent material according to claim 1 , wherein the oxide fluorescent material has a light emission peak wavelength in a range of 700 nm or more and 900 nm or less.

8 . A light emitting device comprising the oxide fluorescent material according to claim 1 and a light emitting element that has a light emission peak wavelength in a range of 365 nm or more and 500 nm or less and irradiates the oxide fluorescent material.

Assignees

• Nichia Corp

Inventors

• Murazaki Yoshinori

Classifications

• C09K11/68

  containing chromium, molybdenum or tungsten · CPC title

• C09K11/681 Primary

  Chalcogenides · CPC title

• H10H20/8512 Primary

  Wavelength conversion materials · CPC title

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• C09K11/685

  Aluminates; Silicates · CPC title