Phosphor converted light emitting device

US7446343B2 · kind B2 · utility

Assignees

• Philips Lumileds Lighting Company LLC · US
• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Gerd O. Mueller · San Jose, US
• Regina B. Mueller-Mach · San Jose, US
• Thomas Juestel · Aachen, DE
• Petra Huppertz · Roetgen, DE
• Detlef Uwe Wiechert · Alsdorf, DE
• Dominik Uhlich · Steinfurt, DE

Key dates

• Filing date: Jan 13, 2007
• Grant date: Nov 4, 2008
• Expiry date: May 3, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/9661
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A phosphor converted light emitting device includes a semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region, the light emitting layer being configured to emit light having a first peak wavelength; a first phosphor configured to emit light having a second peak wavelength; and a second phosphor configured to emit light having a third peak wavelength. The second phosphor is an Eu3+-activated phosphor, configured such that in the excitation spectrum at 298K and 1.013 bar, a maximum intensity in a wavelength range between 460 nm and 470 nm is at least 5% of a maximum intensity in a wavelength range between 220 nm to 320 nm.