Phosphor system

US6419855B1 · kind B1 · utility

Assignee

• State of Oregon acting by and through the State Board of Higher Ed. on Behalf of Oregon State Univ. · US

Inventors

• Douglas A. Keszler · Corvallis, US
• Dong Li · Tempe, US
• John Wager · Corvallis, US
• Benjamin L. Clark · Corvallis, US
• Paul D. Keir · Portland, US

Key dates

• Filing date: Sep 16, 1999
• Grant date: Jul 16, 2002
• Expiry date: Sep 16, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05B33/14
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Phosphor compositions of the formula Zn1-3x/2MxX:Mn, wherein M is selected from the group consisting of the trivalent cations of Al, In, Ga, and mixtures thereof, and X is selected from the group consisting of S, Se, Te, and mixtures thereof are disclosed. Also disclosed are phosphor compositions of the formula, MX:Cu,L,A wherein M is selected from the divalent ions of Sr, Mg, Ca, Ba, X is selected from the group consisting of S, Se, Te, and mixtures thereof, and mixtures thereof, L is selected from the group consisting of the trivalent cations of the lanthanides, Al, In, Ga, Sc, and mixtures thereof, and A is selected from the alkali metal ions or mixtures thereof. Emission chromaticity of the phosphors is controlled by varying codopant concentrations. Electroluminescent devices comprising the phosphors also are disclosed.