# US 11,999,648 B2 · Wavelength conversion member and light emitting device using same

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- Number: US 11,999,648 B2
- Document ID: US11999648B2
- Status: Granted
- Kind: B2
- Application number: 16/977,117
- Filed: 2019-03-25
- Published: 2020-12-31
- Granted: 2024-06-04
- Earliest claimed: 2018-04-25
- Assignees: Nippon Electric Glass Co., Ltd.
- Applicants: Nippon Electric Glass Co., Ltd.
- Inventors: Tadahito Furuyama; Shotaro Fukumoto
- Web page: https://patentgrep.com/patent/US11999648B2

## CPC

- C03C 14/006: {the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material}
- C03C 3/062: with less than 40% silica by weight
- C03C 3/068: containing rare earths
- C03C 3/093: containing zinc or zirconium
- C03C 3/095: containing rare earths
- C03C 4/12: for luminescent glass; for fluorescent glass
- C03C 8/14: Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40)
- G02B 5/20: Filters (polarising elements G02B5/30)
- H10H 20/851: Wavelength conversion means
- C03C 2214/16: Microcrystallites, e.g. of optically or electrically active material
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Provided is a wavelength conversion member which is made of a phosphor powder dispersed in a glass matrix and has an excellent luminous efficiency. A wavelength conversion member is comprising: a phosphor powder dispersed in a glass matrix, wherein the glass matrix has a refractive index (nd) of 1.6 or more and a liquidus temperature of 1070° C. or below.

## Claims

### Claim 1

A wavelength conversion member comprising:
a phosphor powder dispersed in a glass matrix, wherein the glass matrix contains, in terms of % by mass, 25% or more of SiO2; and
the glass matrix has a refractive index (nd) of 1.6 or more and a liquidus temperature of 1070° C. or below.

### Claim 2 (depends on 1)

The wavelength conversion member according to claim 1, wherein the glass matrix further contains, in terms of % by mass, 0.1 to 8% Al2O3, over 0 to 15% B2O3, 0 to 10% MgO, 0 to 15% CaO, 0 to 15% SrO, 0.1 to 50% BaO, 0 to 20% ZnO, 0 to 10% ZrO2, 0 to 5% Nb2O5, 2.1 to 15% TiO2, and 0.1 to 15% La2O3 and (TiO2+La2O3)/B2O3 is 0.5 or more.

### Claim 3 (depends on 1)

The wavelength conversion member according to claim 1, wherein a content of Li2O+Na2O+K2O in the glass matrix is 0 to 5%.

### Claim 4 (depends on 1)

The wavelength conversion member according to claim 1, wherein a content of Sb2O3 in the glass matrix is below 0.2%.

### Claim 5 (depends on 1)

The wavelength conversion member according to claim 1, wherein the phosphor powder is at least one selected from the group consisting of a nitride phosphor, an oxynitride phosphor, an oxide phosphor, a sulfide phosphor, an oxysulfide phosphor, a halide phosphor, and an aluminate phosphor.

### Claim 6 (depends on 1)

The wavelength conversion member according to claim 1, containing the phosphor powder in an amount of 0.01 to 70% by volume.

### Claim 7 (depends on 1)

The wavelength conversion member according to claim 1, being made of a sintered body of a mixture containing a glass powder and the phosphor powder.

### Claim 8 (depends on 1)

A light emitting device comprising: the wavelength conversion member according to claim 1; and a light source operable to irradiate the wavelength conversion member with excitation light.

### Claim 9 (depends on 1)

The wavelength conversion member according to claim 1, wherein a content of the SiO2 in the glass matrix is, in terms of % by mass, 50% or less.