Illumination device, particularly with luminescent ceramics

US8247828B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Hans-Helmut Bechtel · Roetgen, DE
• Wolfgang Busselt · Roetgen, DE
• Peter Josef Schmidt · Aachen, DE
• Joerg Meyer · Wagenfeld, DE

Key dates

• Filing date: Nov 30, 2007
• Grant date: Aug 21, 2012
• Expiry date: Jun 27, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/0002

Abstract

An illumination device includes an active layer, such as a blue LED, covered with a first luminescent ceramic converter layer and partially covered with a second luminescent ceramic converter layer. The first and second conversion layers convert primary photons emitted by the active layer into photons of different, longer wavelengths. The color point of the illumination device can be adjusted by adjusting the relative size of the second conversion layer.