Light emitting devices with improved light extraction efficiency

US7276737B2 · kind B2 · utility

Assignee

• Philips Lumileds Lighting Company LLC · US

Inventors

• Michael D. Camras · San Jose, US
• Gerard Harbers · Sunnyvale, US
• William R. Imler · Oakland, US
• Matthijs Keuper · San Jose, US
• Paul Scott Martin · Pleasanton, US
• Douglas W. Pocius · Fremont, US
• Frank M. Steranka · San Jose, US
• Helena Ticha · Srch, CZ
• Ladislav Tichy · Srch, CZ
• R. Scott West · Pleasanton, US

Key dates

• Filing date: Jan 9, 2006
• Grant date: Oct 2, 2007
• Expiry date: Jan 9, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/856

Abstract

A device includes a light emitting semiconductor device bonded to an optical element. In some embodiments, the optical element may be elongated or shaped to direct a portion of light emitted by the active region in a direction substantially perpendicular to a central axis of the semiconductor light emitting device and the optical element. In some embodiments, the semiconductor light emitting device and optical element are positioned in a reflector or adjacent to a light guide. The optical element may be bonded to the first semiconductor light emitting device by a bond at an interface disposed between the optical element and the semiconductor light emitting device. In some embodiments, the bond is substantially free of organic-based adhesives.