Tokyo Shibaura Denki Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Masao Asada

Yoshio Kimura

Akira Taya

Kazuo Narita

Kenji Terashima

Satoshi Sugano

Kiyoshi Inoue

Minoru Watanabe

Toshio Nishimura

Masao Tezuka

Hisami Nira

Mitsuhiro Oikawa

Tsurahide Cho

Jun-etsu Akiyama

Yoshiyuki Nakada

In ultramarine blue, or a blue pigmented phosphor in which ultramarine blue is a constituent, a coating of organic silicon compound is formed on the surface of the ultramarine blue pigment. This coating prevents fading of the ultramarine blue during the manufacture of cathode ray tubes.

Blue pigmented phosphor

Green-emitting phosphor

Fluorescent lamp

Disclosed is a fluorescent lamp which comprises a mixture of a phosphor (i) comprising an alkaline earth metal halophosphate phosphor activated with divalent europium, represented by the general formula:

Disclosed is a blue-green emitting halophosphate phosphor activated with divalent europium, which is represented by the general formula:

Blue-green emitting halophosphate phosphor

Disclosed is a method for surface treatment of phosphor particles which comprises forming a continuous film of silicon dioxide on the surface of each phosphor particle by treating the phosphor particle with a solution containing an aqueous solution of organic alkali and silicon dioxide dissolved therein.

Method for surface treatment of phosphor particles

Growing community of inventors

Yokohama, Japan

Masao Asada