Patent · US Expired

Light source with a low color temperature

US8979318B2 · kind B2 · utility

2Cited by

1References

17Claims

0Family size

Assignees

OSRAM Opto Semiconductors GmbH · DE
OSRAM GmbH · DE

Inventors

Tim Fiedler · Birkenfeld, DE
Frank Jermann · Königsbrunn, DE
Jörg Strauβ · Regensburg, DE

Key dates

Filing date	Jul 15, 2005
Grant date	Mar 17, 2015
Priority date	—
Expiry date	May 20, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH01L2224/73265
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

LEDs having a low color temperature up to 5000 K, comprising a blue-emitting LED and, connected upstream thereof, two phosphors having a first phosphor from the class of the chliorosilicates and a second phosphor from the class of the nitridosilicates having the formula (Ca,Sr)2Si5N8:Eu.

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