Nichia Chemical Industries, Limited

Nec Corporation

Nichia Kagaku Kogyo K.k.

Nuchia Kagaku Kogyo K.k.

Katsunori Uchimura

Miyuki Sumitomo

Masaki Mori

Masato Hayashi

Shoichi Bando

Tomokazu Suzuki

Yojiro Kondo

Yoshikatsu Aihara

Yasuhiro Mano

Osamu Yamasita

Yoshiaki Shizuki

Toshihiko Ayusawa

Toshifumi Somatomo

Kouichi Kunikata

Kazuo Kaneko

Hidehito Mori

Kenichi Ishidate

Yosinori Hirai

Kouji Morimoto

Masayuki Usui

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

An indium borate phosphor of this invention is represented by formula (In.sub.l-a-b-c-d Tb.sub.a Eu.sub.b Sm.sub.c M.sub.d)BO.sub.3 wherein

Cathode-ray tube containing an indium borate phosphor

A red-emitting phosphor represented by a general formula (Y.sub.1-x-y Cr.sub.x Gd.sub.y).sub.3 (Al.sub.1-z Ga.sub.z).sub.5 O.sub.12 with the provide that 0.0005.ltoreq.x.ltoreq.0.05, O.ltoreq.y.ltoreq.1, O.ltoreq.z.ltoreq.1, providing red- and infrared emitting luminescence, using alone or in a mixture with other phosphors in a cathode ray tube, having a constant main emission peak even if excited by a high current density, having a satisfactory luminescence efficiency, and causing less brightness saturation in proportion as a current density increases.

Phosphor for use in a cathode-ray tube and display device using one

A method of reclaiming a phosphor from a recovered phosphor slurry containing carbon, a bichromate, and polyvinyl alcohol, comprises, (a) a decomposition treatment step of adding an alkali to the recovered phosphor slurry after the slurry is heated to prepare a phosphor suspension having an alkali concentration of 0.5N or less in the slurry, and adding an oxidizing agent in an amount of 1.0 to 20.0 wt % with respect to a dry solid component of the suspension, (b) a weak acid treatment step of separating a phosphor from the suspension, and adding a weak acid to a suspension obtained by adding water to the separated phosphor, thereby adjusting a pH to be 3.0 to 5.0, and (c) a surface treatment step of treating the surface of the phosphor separated from the suspension.

Method of reclaiming phosphor

Phosphors capable of emitting substantially white luminescent were represented by the following general formulae, (I), (II) and (III).

Rare earth phosphor

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Anan, Japan

Katsunori Uchimura