Hitachi, Ltd.

Kasei Optonix, Ltd.

Hitachi Medical Corporation

Teruki Suzuki

Masatoshi Shiiki

Choichiro Okazaki

Shinkichi Tanimizu

Hiromichi Yamada

Tadashi Fukuzawa

Tadashi Furukawa

Hajime Yamamoto

Keizo Suzuki

Tsutomu Yamada

Takashi Hase

Masaji Ishigaki

Yasuhiko Uehara

Masaaki Komatsu

Hidetsugu Matsukiyo

Shin Imamura

Yasukazu Morita

Shigeo Fujino

Susumu Omatoi

Yoshihiro Koseki

Masaki Nakano

Masahiro Nishizawa

Kiyoshi Miura

Saburo Nonogaki

Nobuaki Hayashi

Shigeru Sato

Hajime Morishita

Toshikatsu Manabe

Yukio Ohno

A plasma display device comprising phosphor layer wherein the phosphor layer comprises blue-emission divalent europium activated alkaline earth silicate phosphor which is represented by the following compositional formula (Ae)(Ae')SiO:Eu, wherein x satisfies 0.01&#x2266;x&#x2266;0.1, Ae is at least one alkaline earth element selected from the group consisting of Sr, Ca, and Ba, and Ae&#x2032; is at least one element selected from the group consisting of Zn or (Zn plus Mg).

Plasma display device, luminescent device and image and information display system using the same

The present invention provides a plasma display device, a luminescent device, and an image display system each having an excellent moving-image quality, a long lifetime, and high performance. The plasma display device has a plasma display panel having at least a pair of substrates, a discharge gas space formed between the pair of substrates, electrodes formed on the respective opposing surfaces of the substrates, and a phosphor layer formed on the surface of one of the pair of substrates in contact with the discharge gas space and a driver circuit for driving the panel via the electrodes. In the plasma display device, the decay time ( 1/10 decay time) of light generated from each of the phosphor layers for providing red, green, and blue emission which compose the phosphor layer is not more than 8 ms. The plasma display device and the luminescent device use a blue phosphor (a divalent europium activated alkali earth silicate phosphor) having high performance under excitation caused by a vacuum UV beam and a low-speed electron beam and a composition represented by the following compositional formula:(Ae)(Ae')SiO:Eu.

The luminance of phosphor is enhanced by forming a phosphor screen of a fluorescence generation unit by phosphor expressed by the following composition formula: (LGdCe)(AlGa)O:Mwherein, a, b and c are each in the following ranges of 0&#x2266;a&#x2266;1.0, 0&#x3c;b&#x2266;0.1 and 0&#x2266;c&#x2266;1.0, M is dopant of a monovalent metal element and is included in phosphor by approximately 0&#x3c;d&#x2266;1000 wt-ppm. Dopant M of a monovalent metal element is at least one type of element selected from a group consisting of K, Na, Li, Cu, Ag and Au. Thus, a display using a white light of improved luminescence and having excellent characteristics can be realized.

Light source and display using the same

A plasma display includes a display panel and a driving circuit for driving the display panel. A space for at least one color, of spaces between barrier ribs for defining discharge spaces for red, green and blue colors of the display panel is different from the spaces for other colors.

Adjustment of luminance balance of red, green and blue light emissions for plasma display by using different sized areas of phosphor layers producing corresponding colors

A white light source includes an ultraviolet-visible excitation light generation unit capable of generating visible light and ultraviolet light, and a fluorescence generation unit having a phosphor layer and being capable of generating visible light upon excitation by the ultraviolet light and uses, in the phosphor layer, a red light emitting phosphor represented by the following compositional formula: (Ca Sr Eu )S:M , wherein a, b and c satisfy the following conditions: 0&lE;a<1.0, 0&lE;b<0.1 and 0&lE;c&lE;0.1; and M is a dopant element having absorption of excitation energy at about 350 nm to about 500 nm. The dopant element M includes rare earth elements such as Ce, Yb, Gd and Tm. By substituting part of Ca and/or Sr with Zn, the white light source can exhibit further improved performances. The white light source exhibits an increased red light component as compared with light emitted from conventional (Y Gd Ce ) (Al Ga ) O green light phosphors and is suitably used in display apparatus.

White light source and display apparatus using the same

Phosphor and display device or light source using the same

Rare earth phospho-vandate phosphors containing at least one element of Group IV of the periodic table have spherical or cubic shaped particles and provide higher brightness and longer brightness life, and effective for use in display systems and light emitting systems.

Rare earth phospho-vanadate phosphors, display system and light emitting system

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 black matrix color picture tube has a phosphor layer and black matrix layer formed on the inner surface of the faceplate. A layer of glass having a low softening point is provided between the phosphor layer and the inner surface of the faceplate and between the black matrix layer and the inner surface of the faceplate. The softening point of the glass is below the temperature at which the tube is subjected during a frit baking step employed in the fabrication of the tube. For example, a borophosphate glass is used as the layer of glass having a low softening point.

Black matrix color picture tube

Phosphors and process for producing the same

A light emitting device wherein a blue screen or a red screen is excited by 5 to 25eV photons or electrons, the blue screen containing a self-activated phosphor which is represented by the general formula MP.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57-62 and 64-71, and group-IIIb elements of the periodic table, and where O&lt;b&lt;1.0, the red screen containing a trivalent europium (Eu.sup.3+) activated phosphor which is represented by the general formula M.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57-62 and 64-71, and group-IIIb elements of the periodic table, and where O&lt;a&lt;1.0 and 0&lt;b.ltoreq.1.0.

Light emitting devices based on the excitation of phosphor screens

A light emitting device wherein a blue screen or a red screen is excited by 5 to 25eV photons or electrons, the blue screen containing a self-activated phosphor which is represented by the general formula MP.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0 &lt;b&lt;1.0, the red screen containing a trivalent europium (Eu.sup.3+) activated phosphor which is represented by the general formula M.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0&lt;a &lt;1.0 and 0&lt;b.ltoreq.1.0.

Light emitting device having luminescent screen with self activated blue

A phosphor system consisting of an alkaline-earth metal silicate host lattice activated by trivalent terbium together with monovalent alkaline metal as a charge compensator, said phosphor system corresponding to the formula, X.sub.3-x Y.sub.1-x Si.sub.2 O.sub.8 : Tb.sub.x, Z.sub.x wherein X is at least one of Ba, Sr, and Ca; Y is at least one of Mg and Zn; and Z acting as a charge compensator is at least one of Li, K, and Na, and x is from 0.001 to 0.95, said phosphor system substituting Ca plus Mg for X plus Y of the formula being excluded. The present invention provides an efficient green-emitting phosphor particularly useful for a deluxe fluorescent lamp.

Terbium-activated alkaline-earth metal silicate phosphors

Growing community of inventors

Funabashi, Japan

Teruki Suzuki