Nippon Hoso' Kyokai

Dai Nippon Toryo Co., Ltd.

Takehiro Kojima

Takashi Hase

Akiyasu Kagami

Ryuya Toyonaga

Junro Koike

Yoshiyuki Mimura

Kinichiro Narita

Koichi Takahashi

Minoru Hiraki

Yoshinori Tanigami

A process for preparing a divalent europium activated alkaline earth metal aluminate phosphor represented by the composition formula

Process for preparing a divalent europium activated alkaline earth metal

In an air-tight container made of transparent material, a phosphor, a gas or gas mixture and a pair of discharging electrodes are contained. The discharge gap is in the range of 0.1 to 3.0mm, and the pressure of the gas or gas mixture sealed in the container is such that the product of the pressure and the discharge gap is in the range of 30 to 300 Torr.mm. The gas or gas mixture has discharge radiation spectra within the region of wavelength shorter than 200nm. The phosphor is a europium activated yttrium gadolinium borate phosphor represented by the formula

Gaseous discharge light emitting element

In an air-tight at least partially transparent container, a phosphor, a gas or gas mixture and a pair of discharging electrodes are contained. The discharge gap is in the range of 0.1 to 3.0mm, and the pressure of the gas or gas mixture sealed in the container is such that the product of the pressure and the discharge gap is in the range of 30 to 300 Torr.mm. The gas or gas mixture has discharge radiation spectra within the region of wavelength shorter than 200nm. The phosphor is a manganese activated aluminate phosphor represented by the formula

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Kawasaki, Japan

Takehiro Kojima