Patent · US Active

Narrow band emitting SiAlON phosphor

US11453821B2 · kind B2 · utility

1Cited by

1References

17Claims

0Family size

Assignee

LUMILEDS LLC · US

Inventors

Peter Josef Schmidt · Aachen, DE
Philipp-Jean Strobel · Munich, DE
Volker Weiler · Aachen, DE
Andreas Tücks · Aachen, DE

Key dates

Filing date	Dec 2, 2020
Grant date	Sep 27, 2022
Priority date	—
Expiry date	Dec 2, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/60
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

This specification discloses a method of enhancing the stability and performance of Eu2+ doped narrow band red emitting phosphors. The resulting phosphor compositions are characterized by crystallizing in ordered structure variants of the UCr4C4 crystal structure type and having a composition of AE1−xLi3−2yAl1+2y−zSizO4−4y−zN4y+z:EUx(AE=Ca, Sr, Ba; 0<x<0.04, 0≤y<1, 0<z<0.05, y+z≤1). It is believed that the formal substitution (Al,O)+ by (Si,N)+ reduces the concentration of unwanted Eu3+ and thus enhances properties of the phosphor such as stability and conversion efficiency.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.