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

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.

Claims20

Dependent claims

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.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/595,660Filed 15 Apr 2008

Priority

EP 0710663020 Apr 2007

Published

US 2010/0053933 A14 Mar 2010

Granted

18 Jun 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification27 codes

H10H 20/8512
Characterised by their material, e.g. binder: wavelength conversion materials
C01B 21/0602
Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one…:…
C04B 35/581
Based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides: based on aluminium nitride
C04B 35/583
Based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides: based on boron nitride

White emitting light source and luminescent material with improved colour stability

Life of this patent

White emitting light source and luminescent material with improved colour stability

Life of this patent

Abstract

Claims20