Tokyo Shibaura Denki Kabushiki Kaisha

Tokyo Shibaura Electric Co., Ltd.

Tomohiko Kobuya

Akira Taya

Minoru Watanabe

Toshio Nishimura

Kohtaro Kohmoto

Kenichi Shimizu

Junetsu Akiyama

Tadao Omi

Kazunori Nagafuchi

Kotaro Koomoto

Takayoshi Fuchida

A rare earth silicate phosphor co-activated by cerium and terbium which is expressed by the general structural formula:

Fluorescent lamp containing a green emitting rare earth silicate

A fluorescent lamp which comprises a vacuum-tight envelope provided with electrodes between which discharge takes place during the operation of said fluorescent lamp. The envelope is coated on the inside with a phosphor composition layer comprising: a first light-emitting material having an emission spectrum with a peak in the wavelength range between 465 and 490 nm, or preferably between 480 and 490 nm, and a half width ranging from 30 to 120 nm, or preferably from 70 to 100 nm; a second light-emitting material having an emission spectrum with a peak in the wavelength range between 550 and 580 nm, or preferably between 560 and 570 nm, and a smaller half width than 110 nm; a third light-emitting material having an emission spectrum with a peak in the wavelength range between 600 and 620 nm, or preferably between 610 and 620 nm; and a fourth light-emitting material having an emission spectrum with a peak in the wavelength range between 480 and 500 nm, or preferably between 480 and 490 nm, thereby ensuring high luminous flux and satisfactory color rendering.

Fluorescent lamp

Growing community of inventors

Kawasaki, Japan

Tomohiko Kobuya