White phosphor converted LED with stable flux output versus temperature

US10205066B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Hans-Helmut Bechtel · Roetgen, DE
• Oliver Steigelmann · Aachen, DE
• Detlef Uwe Wiechert · Alsdorf, DE
• Matthias Heidemann · Aachen, DE

Key dates

• Filing date: Feb 15, 2016
• Grant date: Feb 12, 2019
• Expiry date: Feb 15, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0003
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The invention provides a lighting device comprising a solid state light source and a ceramic body, wherein the solid state light source is configured to provide blue light source light to the ceramic body, wherein the ceramic body comprises a ceramic material configured to wavelength convert part of the blue light source light into yellow converter light, to provide white lighting device light comprising said blue light source light and said yellow converter light, said white lighting device light having a color point selected from the range of 0.18≤u′≤0.25 and 0.42≤v′≤0.54, and wherein the ceramic material comprises a (Y(1-y-q-z),Gdy,Luq, Cez)3(Al(1-x),Gax)5O12 ceramic material, with 0≤x≤0.6, 0≤y≤0.5, 0≤q<1 and 0.001≤z≤0.06.