LED based device with wide color gamut

US10158052B2 · kind B2 · utility

Assignee

• LUMILEDS LLC · US

Inventors

• Volker Weiler · Aachen, DE
• Peter Josef Schmidt · Aachen, DE
• Hans-Helmut Bechtel · Roetgen, DE

Key dates

• Filing date: Feb 2, 2017
• Grant date: Dec 18, 2018
• Expiry date: Feb 2, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/0002
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a lighting unit comprising a source of blue light, a source of green light, a first source of red light comprising a first red luminescent material, configured to provide red light with a broad band spectral light distribution, and a second source of red light comprising a second red luminescent material, configured to provide red light with a spectral light distribution comprising one or more red emission lines. Especially, the first red luminescent material comprises (Mg,Ca,Sr)AlSiN3:Eu and/or (Ba,Sr,Ca)2Si5-xAlxOxN8-x:Eu, and the second red luminescent material comprises K2SiF6:Mn.