Phosphor, method for producing a phosphor and use of a phosphor

US11292965B2 · kind B2 · utility

Assignees

• OSRAM Opto Semiconductors GmbH · DE
• OSRAM GmbH · DE

Inventors

• Tim Fiedler · Birkenfeld, DE
• Daniel Bichler · Augsburg, DE
• Stefan Lange · Shepperton, GB
• Rebecca Römer · Regensburg, DE
• Frank Jermann · Königsbrunn, DE
• Frauke Thienel · Birkenfeld, DE
• Barbara Huckenbeck · Augsburg, DE
• Alexander Baumgartner · Donaustauf, DE
• Vera Stöppelkamp · Augsburg, DE
• Norbert Bönisch · Königsbrunn, DE
• Hailing Cui · Regensburg, DE

Key dates

• Filing date: Jun 2, 2020
• Grant date: Apr 5, 2022
• Expiry date: Jun 2, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/73265
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A phosphor and a method for making the phosphor are disclosed. In an embodiment a phosphor for emission of red light includes Sr(SraCa1-a)Si2Al2N6:Eu, wherein x is 0.8<x≤1, wherein between 0.1% and 5% inclusive of the Sr, Ca and/or Sr/Ca lattice sites are replaced by Eu, wherein the parameter value a is between 0.6 and 1.0 inclusive, wherein the phosphor has a structure comprising (Si/Al)N4 tetrahedra arranged in a 3D network, in which layers in an a-c plane are linked in a b-direction, and wherein pure Sr positions and positions having a mixed Sr/Ca population are intercalated between the network, layer by layer.