# US 8,465,166 B2 · White emitting light source and luminescent material with improved colour stability

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- Number: US 8,465,166 B2
- Document ID: US8465166B2
- Status: Granted
- Kind: B2
- Application number: 12/595,660
- Filed: 2008-04-15
- Published: 2010-03-04
- Granted: 2013-06-18
- Earliest claimed: 2007-04-20
- Assignees: Konklijke Philips Electronics N.V.
- Applicants: Joerg Meyer; Hans-Helmut Bechtel; Walter Mayr; Peter Schmidt; Baby-Seriyati Schreinemacher; Detlef Uwe Wiechert
- Inventors: Joerg Meyer; Hans-Helmut Bechtel; Walter Mayr; Peter Schmidt; Baby-Seriyati Schreinemacher; Detlef Uwe Wiechert
- Web page: https://patentgrep.com/patent/US8465166B2

## CPC

- H10H 20/8512: {Wavelength conversion materials}
- C01B 21/0602: {with two or more other elements chosen from metals, silicon or boron}
- C04B 35/581: based on aluminium nitride
- C04B 35/583: based on boron nitride
- C04B 35/584: based on silicon nitride
- C04B 35/6455: {Hot isostatic pressing}
- C09K 11/0883: {Arsenides; Nitrides; Phosphides}
- C09K 11/77928: {Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides}
- C01P 2002/84: by UV- or VIS- data
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3224: Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B 2235/3229: Cerium oxides or oxide-forming salts thereof
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/3852: Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B 2235/386: Boron nitrides
- C04B 2235/3865: Aluminium nitrides
- C04B 2235/3873: Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
- C04B 2235/604: Pressing at temperatures other than sintering temperatures
- C04B 2235/608: Green bodies or pre-forms with well-defined density
- C04B 2235/6582: Hydrogen containing atmosphere
- C04B 2235/9646: Optical properties
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The invention relates to a white emitting light source with an improved luminescent material of the formula (AEN2/3)*b (MN)*c (SiN4/3)*d1 CeO3/2*d2 EuO*x SiO2*y AlO3/2 wherein AE is an alkaline earth metal chosen of the group of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element chosen of the group of Al, B, Ga, Sc with d1>10*d2. In combination with a UV to blue light generating device this material leads to an improved light quality and stability, especially an improved temperature stability for a wide range of applications.

## Claims

### Claim 1

An illumination system, comprising at least one luminescent material, the luminescent material comprising:
a(AEN2/3)*b(MN)*c(SiN4/3)*d1CeO3/2*d2EuO*xSiO2*yAlO3/2
wherein AE is an alkaline earth metal selected from the group consisting of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element selected from the group consisting of Al, B, Ga, Sc or mixtures thereof with
0.95≦2*(a+d1+d2)/(b+c+x+y)≦1.2,
a+d1+d2≧c+x,
(b+y):(c+x)≧1,
(b+y)≦1+10*d1,
b≧5*y,
c≧10*x,
0.0001≦d1≦0.2 and d1≧10*d2.

### Claim 2 (depends on 1)

The illumination system of claim 1, wherein d1 is ≧0.01% and ≦20% of a.

### Claim 3 (depends on 1)

The illumination system of claim 1, wherein the ratio (b+y):(c+x) in said at least one luminescent material is ≧1.01 and ≦1.20.

### Claim 4 (depends on 1)

The illumination system of claim 1, wherein in said at least one luminescent material (b+y) is ≦1+10*d1.

### Claim 5 (depends on 1)

The illumination system of claim 1, wherein in said at least one luminescent material b≧5*y and c≧10*x.

### Claim 6 (depends on 1)

The illumination system of claim 1, wherein in said at least one phosphor luminescent material d1 is ≦0.01.

### Claim 7 (depends on 1)

The illumination system of claim 1 wherein the full width half maximum (FWHM) of the emission spectra of said at least one luminescent material is ≧120 nm.

### Claim 8 (depends on 1)

The illumination system of claim 1 whereby the emission spectrum of said at least one luminescent material shows a composed emission comprising a maximum in the wavelength range between ≧500 and ≦600 nm and a full width half maximum (FWHM) of ≧80 nm and an emission maximum in the wavelength range between ≧600 and ≦650 nm and a full width half maximum (FWHM) of ≧30 and ≦140 nm.

### Claim 9 (depends on 1)

The illumination system of claim 1, wherein in said at least one luminescent material [Ba]+[Sr]+[Mg] is ≦0.9*[Ca].

### Claim 10 (depends on 1)

A system comprising a illumination system according to claim 1, the system being used in one or more of the following applications:
Office lighting systems
household application systems
shop lighting systems,
home lighting systems,
accent lighting systems,
spot lighting systems,
theater lighting systems,
fiber-optics application systems,
projection systems,
self-lit display systems,
pixelated display systems,
segmented display systems,
warning sign systems,
medical lighting application systems,
indicator sign systems,
decorative lighting systems
portable systems
automotive applications
green house lighting systems.

### Claim 11 (depends on 1)

The illumination system of claim 1 whereby the emission spectrum of said at least one luminescent material shows a composed emission comprising a maximum in the wavelength range between ≧530 and ≦570 nm and a full width half maximum (FWHM) of ≧120 nm and an emission maximum in the wavelength range between ≧600 and ≦620 nm and a full width half maximum (FWHM) of ≧30 and ≦100 nm.

### Claim 12

An illumination system comprising at least one luminescent material, the luminescent material comprising:
a(AEN2/3)*b(MN)*c(SiN4/3)*d1CeO3/2*d2EuO*xSiO2*yAlO3/2
wherein AE is an alkaline earth metal selected from the group consisting of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element selected from the group consisting of Al, B, Ga, Sc or mixtures thereof with
1≦2*(a+d1+d2)/(b+c+x+y)≦1.2
a+d1+d2≧c+x,
(b+y):(c+x)≧1,
(b+y)≦1+10*d1,
b≧5*y,
c≧10*x,
0.0001≦d1≦0.2 and d1≧10*d2.

### Claim 13 (depends on 12)

The illumination system of claim 12, wherein d1 is ≧0.01% and ≦20% of a.

### Claim 14 (depends on 12)

The illumination system of claim 12, wherein the ratio (b+y):(c+x) in said at least one luminescent material is ≧1.01 and ≦1.20.

### Claim 15 (depends on 12)

The illumination system of claim 12, wherein in said at least one luminescent material (b+y) is ≦1+10*d1.

### Claim 16 (depends on 12)

The illumination system of claim 12, wherein in said at least one luminescent material b≧5*y and c≧10*x.

### Claim 17 (depends on 12)

The illumination system of claim 12, wherein in said at least one luminescent material d1 is ≦0.01.

### Claim 18 (depends on 12)

The illumination system of claim 12 wherein the full width half maximum (FWHM) of the emission spectra of said at least one luminescent material is ≧120 nm.

### Claim 19 (depends on 12)

The illumination system of claim 12 whereby the emission spectrum of said at least one luminescent material shows a composed emission comprising a maximum in the wavelength range between ≧500 and ≦600 nm and a full width half maximum (FWHM) of ≧80 nm and an emission maximum in the wavelength range between ≧600 and ≦650 nm and a full width half maximum (FWHM) of ≧30 and ≦140 nm.

### Claim 20 (depends on 12)

The illumination system of claim 12, wherein in said at least one luminescent material [Ba]+[Sr]+[Mg] is ≦0.9*[Ca].