LED illumination device with layered phosphor pattern

US7327078B2 · kind B2 · utility

Assignee

• LUMINATION LLC · US

Inventors

• Anant Achyut Setlur · Niskayuna, US
• Joseph John Shiang · Niskayuna, US
• Alok Mani Srivastava · San Francisco, US
• Holly Ann Comanzo · Niskayuna, US
• Stanton Earl Weaver · Broadalbin, US
• Charles Becker · Rexford, US

Key dates

• Filing date: Mar 30, 2004
• Grant date: Feb 5, 2008
• Expiry date: Mar 13, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/0361
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and/or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.