Electroluminescent light source with improved color rendering

US8471456B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Hans-Helmut Bechtel · Roetgen, DE
• Wolfgang Busselt · Roetgen, DE

Key dates

• Filing date: Sep 29, 2005
• Grant date: Jun 25, 2013
• Expiry date: Feb 24, 2027

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K59/38

Abstract

An electroluminescent light source includes a layer structure comprising a first sublayer structure comprising at least one electrode as anode, one electrode as cathode and an electroluminescent layer located therebetween for emitting light, a second sublayer structure which adjoins the electrode provided for transmission, said second sublayer structure consisting of at least one semitransparent layer for partially reflecting the light, and a third sublayer structure which, as seen in the emission direction of the light, is arranged behind the second sublayer structure, said third sublayer structure comprising at least one layer having particles for absorbing some of the light at wavelengths below a threshold wavelength, for emitting light at wavelengths above the threshold wavelength, and for scattering the non-absorbed light.