Nec Corporation

Nichia Chemical Industries, Limited

Yasuhiro Mano

Masato Hayashi

Katsunori Uchimura

Yojiro Kondo

Masaki Mori

Kenichi Ishidate

Kazuo Kaneko

Osamu Yamasita

Hidehito Mori

Toshihiko Ayusawa

Yosinori Hirai

Masayuki Usui

In the production of a fluorescent material, firstly a particle growth retardant is mixed with a fluorescent raw material and then the mixture is baked, whereupon the baked mixture is washed and dried as an intermediate fluorescent material. Then, the particle growth retardant is removed from the surface of the intermediate fluorescent material and crystal defects are formed in the particle-growth-retardant-free intermediate fluorescent material using a ball mill or an ultrasonic vibrator, etc. Finally, the resulting intermediate fluorescent material is baked again and is then washed and dried as a final fluorescent material. This fluorescent material is particularly useful when used in a scatter electroluminescent panel serving as a back light of a liquid crystal display, which must be very small in thickness and light in weight.

Method of manufacturing fluorescent material

On manufacturing a low voltage electron beam excitation phosphor display apparatus (10) which includes an anode (6) having a principal surface and enclosed in a vacuum chamber (1, 2, and 3), a phosphor film (7) formed on the principal surface, and a cathode (9) enclosed in the vacuum chamber opposite to the phosphor film, a phosphor is prepared which consists essentially of an oxisulfide and an oxide which is inevitably formed on a surface of the oxisulfide on preparing the phosphor. The oxisulfide is represented by Ln.sub.2 O.sub.2 S:R, where Ln is at least one selected from a group consisting of Gd, La, Y, and Lu and where R is a rare-earth element. The oxide is removed from the phosphor to produce an oxide-removed phosphor. A pasts comprising a mixture of the oxide-removed phosphor, a conductive material, and an autolytic type binder is coated on the principal surface of the anode which is formed on an insulating substrate (1) constituting the vacuum chamber. The binder of the paste is heated in a nonoxidizing atmosphere to form, on the principal surface of the anode, the phosphor film which has the oxide-removed phosphor and the conductive material. The anode and the cathode are enclosed in the vacuum chamber to obtain a manufactured low voltage electron beam excitation phosphor display apparatus. The oxide may be Ln.sub.2 O.sub.3 into which a component Ln.sub.2 O.sub.2 S of the oxisulfide is changed.

Low voltage electron beam display apparatus having brightness increased

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Shiga, Japan

Yasuhiro Mano