Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matshushita Electric Industrial Co., Ltd.

Hiroshi Setoguchi

Masaki Aoki

Junichi Hibino

Kazuhiko Sugimoto

Yoshinori Tanaka

Yuichiro Miyamae

Hiroyuki Kawamura

Keiji Horikawa

Mitsuhiro Otani

Teppei Hosokawa

Yumi Kondo

Izumi Toyoda

A plasma display device provided with a green color phosphor which is charged entirely with a positive potential, adsorbs only limited amounts of water, carbon monoxide, carbon dioxide and hydrocarbon, and not liable to cause chemical reaction thereto. A green color phosphor layer is formed of the green phosphor comprising at least one compound selected from among materials defined by the general formulae of M(GaAl)O:Mn(where 'M' denotes one of Zn, Mg, Ca and Sr), (YGd) (GaAl)(BO):Tb, (YGd) (GaAl)(BO):Ce, Tb, (YGd) BO:Tband (YGd)(GaAl)O:Tb.

Plasma display device

Phosphor layers (G,B, andR) are made of a combination of: blue and green phosphors that are positively charged on their surfaces and baked in an oxygen-nitrogen atmosphere to reduce oxygen vacancy, and that have a &#x3b2;-alumina crystal structure; and a red phosphor made of an yttrium oxide compound. Uniformly forming such phosphor layers on the wall surfaces of barrier ribs () provides equal charge characteristics of the phosphors of respective colors, reduces oxygen vacancy in the phosphors, and inhibits adsorption of various gases in the panel production process. This can stabilize the discharge characteristics and prevent luminance degradation at driving the panel.

Plasma display with phosphors containing a &#x3b2;-alumina crystal structure

In a phosphor whose host crystal is constituted of an oxide, a method of preparing the phosphor where the oxygen deficiencies in the phosphor are not many, and a plasma display device using the same are provided. After processes of weighing, mixing and filling powders of the phosphor, a process for firing in a reducing atmosphere and a process for firing in an oxidizing atmosphere after the last reducing atmosphere process are provided. In addition, a firing temperature in the oxidizing atmosphere process is not less than 600&#xb0; C. and not more than 1000&#xb0; C.

Plasma display device and method of preparing phosphor

Disclosed here is a plasma display unit that employs phosphors having an amount of charge controlled close to zero, by which degradation in luminance, color temperature, and charge characteristics can be minimized. A phosphor bearing positive or negative charge is coated with a compound for controlling the amount of charge of the phosphor through a strong chemical bonding, whereby the amount of charge of a phosphor can be suppressed within &#xb1;0.01 &#x3bc;C/g. Controlling the amount of charge of phosphors close to zero can keep impurity gases away from the phosphor particle when the panel is in operation, suppressing problems critical to driving a plasma display unit, such as luminance degradation of phosphors, improper alignment of color in panel operation, luminance degradation when the panel displays all white.

Phosphor and plasma display unit

The present invention provides a plasma display panel that suppresses discharge sustain voltage, and reduces brightness degradation of a phosphor. In the plasma display panel, as protective film () made of magnesium oxide (MgO) formed on dielectric glass layer (), protective film () made of magnesium oxide (MgO) with oxide added with an electronegativity of 1.4 or higher, is formed to suppress impure gas adsorption by protective film (), stabilizes discharge sustain voltage, and reduces brightness degradation.

Plasma display panel having a magnesium oxide protective film and method for producing same

A method of manufacturing a plasma display panel is disclosed. The method includes forming at least one of a dielectric layer on a principal face of a substrate, barrier ribs which partition a discharging space on the dielectric layer, and a phosphor layer disposed between the barrier ribs using an inorganic material into which solution including a degassing material is impregnated.

Plasma display panel manufacturing method

A plasma display device provided with a green color phosphor which is charged entirely with a positive potential, adsorbs only limited amounts of water, carbon monoxide, carbon dioxide and hydrocarbon, and not liable to cause chemical reacttion thereto. The green color phosphor used is any one or a combination two or more kinds of phosphors selected from among compounds defined by the general formulae of MAlO:Mn(where 'M' denotes one of Ca, Sr, Eu and Zn) having a magnetoplumbite crystal structure, (YGd) (GaAl)(BO):Tb, (YGd) (GaAl)(BO):Ce, Tb, (YGd) BO:Tband (YGd)(GaAl)O:Tbhaving any of an yttrium borate crystal structure and yttrium aluminate crystal structure.

A plasma display device including a green phosphor of which brightness is hardly deteriorated and a production method therefore are disclosed. The plasma display device comprises a plasma display panel in which a plurality of discharge cells of one color or a plurality of colors are disposed, red phosphor layersR, green phosphor layersG, and blue phosphor layersB are arranged correspondingly to the respective discharge cells, and the red phosphor layersR, the green phosphor layersG, and the blue phosphor layersB are excited by ultraviolet rays to emit light. The green phosphor layersG include a green phosphor expressed by (MEuTb)O.MgO.2SiO(here, M is at least one element selected from Ca, Sr, and Ba).

Plasma display device and method of manufacturing same

A plasma display panel having an excellent image display quality and high reliability is provided by preventing deterioration of a phosphor due to hydrocarbon gas remaining in the plasma display panel. The plasma display panel includes front panel () and rear panel () disposed opposing each other, and front panel () is provided with a plurality of display electrodes composed of a pair of scan electrodes () and sustain electrodes (), and rear panel () has barrier ribs () forming discharge cells (). In the plasma display panel, rear panel () includes data electrodes () perpendicular to display electrodes composed of a pair of scan electrodes () and sustain electrodes () on substrate (), dielectric layer () covering data electrodes (), reflective layer () containing an oxidation catalyst and covering at least a part of dielectric layer (), and phosphor layer () covering reflective layer ().

Plasma display panel having a reduced impurity gas content

A plasma display device provided with a green color phosphor which is charged entirely with a positive potential, adsorbs only limited amounts of water, carbon monoxide, carbon dioxide and hydrocarbon, and not liable to cause chemical reaction thereto. The green color phosphor used is a combination of any of phosphors defined by the general formula of MMgAlO:Mn(where 'M' denotes one of La and Ce) having a magnetoplumbite crystal structure, yttrium borate group and yttrium aluminate group phosphors defined by the general formulae of (YGd) BO:Tb, (YGd) (GaAl)(BO):Tb, (YGd) (GaAl)(BO):Ce, Tb, (Y)(GaAl)O:Tband La MgAlO:Ce, Tb.

Plasma display device with green emitting phosphor that becomes positively charged

Fine particles of a phosphor are weighed, mixed, and filled. Provided after this step are at least one step of firing the particles in a reducing atmosphere, and a step of pulverizing, dispersing, rinsing, drying and then treating the particles in an ozone atmosphere after the last step of treatment in the reducing atmosphere. This method recovers oxygen vacancy in the host crystal of the phosphor.

Process for producing phosphor and plasma display panel unit

Fine particles of a phosphor are weighed, mixed, and filled. Provided after this step are at least one step of firing the particles in a reducing atmosphere, and a step of pulverizing, dispersing, rinsing, drying and then performing oxygen ion implantation treatment for implanting oxygen ions and annealing the particles, after the step of treatment in the reducing atmosphere. This method recovers oxygen vacancy in the host crystal of the phosphor.

A plasma display device comprises blue phosphor which restricts adsorption of water and hydrocarbon gases to a surface thereof, reduces degradation of luminance and chromaticity change, and improves discharge characteristic. Among phosphor layers used for a plasma display, a blue phosphor layer comprises one of compounds symbolized by BaMgAlO:Euand BaSrMgAlO:Eu, of which phosphor contains 0.2 to 0.8 in number x of Eu atoms, and the Eu atoms comprises 25% to 85% concentration of bivalent Eu ions, and 15% to 75% concentration of trivalent Eu ions.

Plasma display unit, phosphor and process for producing phosphor

Fine particles of a phosphor are weighed, mixed, and filled. Provided after this step are at least one step of firing the particles in a reducing atmosphere, and a step of pulverizing, dispersing, rinsing, drying and then treating the particles in an oxygen plasma atmosphere after the last step of treatment in the reducing atmosphere. This method recovers oxygen vacancy in the host crystal of the phosphor.

A plasma display device includes a blue phosphor composed of a compound represented by MeMgSiO:Eu (where, Me is at least calcium (Ca), strontium (Sr), or barium (Ba)). Concentration of bivalent Eu ions is 45 to 95% and concentration of trivalent Eu ions is 5 to 55%, of the europium (Eu) atoms contained in the blue phosphor layer. The plasma display device has less luminance degradation in a panel manufacturing process, high luminance, and long lifetime.

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Osaka, Japan

Hiroshi Setoguchi