Pigment coated phosphor and high contrast color television cathode ray tube using same

US4307320A · kind A · utility

Assignee

• Kasei Optonix, Ltd. · JP

Inventors

• Noboru Kotera · Odawara, JP
• Thihiro Yoshida · Hadano, JP
• Toshiaki Hatsumi · Odawara, JP
• Kazuhito Iwasaki · Odawara, JP
• Isao Iwamoto · Hiratsuka, JP
• Katuzo Kanda · Matsuyama, JP
• Seiji Murakami · Odawara, JP
• Shusaku Eguchi · Odawara, JP

Key dates

• Filing date: Jun 19, 1979
• Grant date: Dec 22, 1981
• Expiry date: Jun 19, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K11/025
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pigment coated phosphors comprising a europium activated yttrium oxysulfide phosphor having a europium activator value within a range of 0.04 gram atom to 0.066 gram atom per 1 mol of yttrium oxysulfide having adhered thereto red colored pigment particles such as cadmium sulfoselenide pigment particles, rouge pigment particles or red lead pigment particles, in respective amounts of 0.1 to 2.0 wt %, 0.05 to 2.0 wt % or 0.1 to 12 wt %, based upon the europium activated yttrium oxysulfide phosphor; and a cathode ray tube for high contrast color television using as a red emitting phosphor at least one of the three pigment coated phosphors.