Coated narrow band red-emitting fluorosilicates for semiconductor LEDS

US9580643B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Volker Weiler · Aachen, DE
• Peter Josef Schmidt · Aachen, DE

Key dates

• Filing date: Feb 13, 2013
• Grant date: Feb 28, 2017
• Expiry date: Feb 13, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8515
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a lighting unit comprising a light source, configured to generate light source light and a particulate luminescent material, configured to convert at least part of the light source light into luminescent material light, wherein the light source comprises a light emitting diode (LED), wherein the particulate luminescent material comprises particles comprising cores, said cores comprising a phosphor comprising M′xM2-2xAX6 doped with tetravalent manganese, wherein M′ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, at least comprising silicon, wherein X comprises a monovalent anion, at least comprising fluorine, and wherein the particles further comprise a metal phosphate based coating, wherein the metal of the metal phosphate based coating is selected from the group consisting of Ti, Si and Al.