Kasei Optonix, Ltd.

Hitachi, Ltd.

Dai Nippon Toryo Co., Ltd.

Shigeo Fujino

Takashi Hase

Hajime Yamamoto

Hiromichi Yamada

Tsutomu Yamada

Teruki Suzuki

Yasuhiko Uehara

Hidetsugu Matsukiyo

Yasukazu Morita

Susumu Omatoi

Yoshihiro Koseki

Masachika Yaguchi

Shigetaro Furuta

Haruhiro Kato

Akio Toshinai

Toshio Jinnai

Masato Hayashi

A fluorescent lamp includes either laminated layers including a non-fluorescent substance layer, and a phosphor layer, or a layer including a mixture of the non-fluorescent substance, and a phosphor, wherein the non-fluorescent substance is a rare earth oxide of either yttrium, gadolinium, or lanthanum. The rare earth oxide is fired to at least 1000.degree. C. thereby providing the lamp with a higher luminous flux maintaining ratio.

Fluorescent lamp including fired non-luminescent material

A fluorescent lamp having a non-fluorescent substance layer and a phosphor layer laminated and coated on, or having a fluorescent composition composed of a mixture of a non-fluorescent substance and a phosphor, coated on the inner wall of a glass bulb, wherein the non-fluorescent substance is an oxide containing at least one rare earth element selected from the group consisting of yttrium, gadolinium and lanthanum.

Fluorescent lamp

Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.

Phosphor and cathode-ray tube using the same

A borate phosphor represented by the formula a(M.sup.II.sub.1-x, M.sup.IV.sub.x/2)O.bM.sup.V.sub.2 O.sub.5.cM.sup.I.sub.2 O.(B.sub.1-y-z,M.sup.III.sub.y, M.sup.VI.sub.z/2).sub.2 O.sub.3 :dCe,eTb wherein M.sup.II is at least one divalent metal selected from the group consisting of Mg, Be, Zn, Cd, Ca, Sr and Ba; M.sup.IV is at least one tetravalent element selected from the group consisting of Si, Ti, Ge, Zr, Sn, Th and Pb; M.sup.V is at least one pentavalent element selected from the group consisting of P, V, Nb, Sb, Ta and As; M.sup.I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M.sup.III is at least one trivalent metal selected from the group consisting of Al, Sc, Ga, Y, In, La, Lu, Gd, Bi and Tl; M.sup.VI is at least one hexavalent meteal selected from the group consisting of Mo, Te and W; and a, b, c, d, e, x, y and z are numbers satisfying the conditions of 0&lt;a.ltoreq.2.0; 0.ltoreq.b.ltoreq.0.3; 0.ltoreq.c.ltoreq.0.3, 0&lt;d.ltoreq.0.6, 0.ltoreq.e.ltoreq.0.6, 0.ltoreq.x.ltoreq.0.6, 0.ltoreq.y.ltoreq.0.35 and 0.ltoreq.z.ltoreq.0.01, respectively. The phosphor emits blue to green light of high luminance under excitation of ultraviolet rays, cathode rays, X-rays, vacuum ultraviolet rays, or the like. Particularly, the phosphor emits blue to green light of higher luminance than the conventional cerium activated or cerium and terbium activated oxide phosphors under excitation of ultraviolet rays or vacuum ultraviolet rays.

Borate phosphor

The display in a diffusion type electrochromic display device is turned off with high response by applying an A.C. input voltage having a frequency of one to ten times as high as the cut-off frequency. The diffusion type electrochromic display device is an EC display device which uses an EC composition consisting of an EC compound coloring in a reduced state and a solvent in which the solubility of the compound to the solvent is 10.sup.-2 mol/(100 g solvent) or more in a reduced state and 10.sup.-1 mol/(100 g solvent) or more in an oxidized state. The cut-off frequency is a critical frequency at a freqency higher than which the oxidization or reduction of the EC compound cannot follow the change in the input voltage, which is normally 20 to 50 Hz.

Method of turning off the display in electrochromic display devices

Growing community of inventors

Odawara, Japan

Shigeo Fujino