Phosphor blends for green traffic signals

US7321191B2 · kind B2 · utility

Assignee

• LUMINATION LLC · US

Inventors

• Anant Achyut Setlur · Niskayuna, US
• Emil Radkov · Kyle, US
• Alok Mani Srivastava · San Francisco, US
• Stanton Earl Weaver · Broadalbin, US
• Thomas Elliot Stecher · Scotia, US
• Holly Ann Comanzo · Niskayuna, US

Key dates

• Filing date: Nov 2, 2004
• Grant date: Jan 22, 2008
• Expiry date: Jul 16, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8515
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

There is provided a blue-green illumination system, including a semiconductor light emitter, and a luminescent material, wherein the system has an emission with CIE color coordinates located within an area of a of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: i) x=0.0137 and y=0.4831; ii) x=0.2240 and y=0.3890; iii) x=0.2800 and y=0.4500; iv) x=0.2879 and y=0.5196; and v) x=0.0108 and y=0.7220. The luminescent material includes two or more phosphors. The illumination system may be used as the green light of a traffic light or an automotive display.