Abstract: A plasma display panel includes a rear plate, a front plate parallel to and spaced apart from the rear plate, and a plurality of ribs between the plates to define a plurality of discharge space groups therebetween. Each discharge space group includes a first discharge space and a second discharge space. A first fluorescent layer is coated in the first discharge space and on a first side wall surface of the ribs surrounding the first discharge space, and a second fluorescent layer is coated in the second discharge space and on a second side wall surface of the ribs surrounding the second discharge space. A second thickness of the second fluorescent layer is larger than a first thickness of the first fluorescent layer so that the surface area of the first fluorescent layer is larger than the surface area of the second fluorescent layer.

Abstract: A fluorescent lamp ensures categorical color perception for surface colors of at least red, green, blue, yellow and white, while improving the luminous efficiency in scotopic vision and mesopic vision or in a wide visual field, wherein dominant radiation is obtained from a phosphor which has peak emission wavelength in a wavelength region from 530 to 580 nm and a region from 600 to 650 nm, flux ratio of a phosphor having peak emission wavelength in a wavelength region from 420 to 530 nm is set to 4 to 40% of the total flux radiated in the dominant wavelength band, correlated color temperature of the lamp light color is set to 3500 K to ∞ and Duv (Duv=&Dgr;uv×1000, &Dgr;uv is the distance of color point from Plankian locus on the CIE 1960 uv chromaticity diagram) is set within a range from 5 to 70.

Abstract: An EL element comprising: a light transmitting substrate; a light transmitting electrode layer formed on the substrate; a light emitting layer containing a positive ion exchanger; a dielectric layer; a back electrode layer; and a dielectric insulation layer disposed between the light transmitting electrode layer and the light emitting layer. The dielectric insulation layer is formed of a synthetic resin that is insoluble with a synthetic resin binder forming the light emitting layer. The present invention provides an EL element having an improved illuminating performance, where an occurrence of a dark spot is suppressed, in addition to a suppression of an occurrence of a black spot.

Abstract: In the luminescent screen of a flourescent lamp an organic europium compound is incorporated for converting mercury radiation between 350 nm and 450 nm into red light. The organic europium compound is diluted in an organic polymer. When the fluorescent lamp is dimmed its colour point shifts into the red similar to incandescent lamps and not into the blue.

Abstract: The invention discloses new luminescent materials for use as UV-A phosphors in suntanning lamps. The luminescent materials are of general formula Ca3-xB2P2O11+0.5x:xCe3+ and Ca2.5-xB5.5P2O15.75+0.5x:xCe3+.

Abstract: A low-wattage mercury vapor discharge fluorescent lamp is provided for use with existing 110V high frequency electronic ballasts. The lamp has a discharge sustaining fill gas of mercury vapor and an inert gas that does not require a starting aid. The inert gas has 40-100 vol. % krypton, balance argon, and the fill gas has a total pressure of 0.5-3 torr. The phosphor layer has a coating weight of 2.3-4.3 mg/cm2.

Abstract: The device for disinfecting water comprises a gas discharge lamp including a discharge vessel with walls composed of a dielectric material, which walls are provided on their outer surfaces with at least a first and a second electrode, and which discharge vessel contains a gas filling containing xenon, the inner surface of the walls being at least partly covered with a coating containing a phosphor emitting in the UV-C range. Such a device for disinfecting water can always be made 100% operation within milliseconds, and the UV-radiation of the device has a spectral composition which lies exclusively in the range relevant for disinfecting, i.e. between 230 and 300 nm.

Abstract: Green-emitting phosphor having a composition formula represented by (Y1-x-aGdxMa)3-3yTb3y(Al1-zGaz)5O12, where 0<x≦1, 0≦a<1, 0<x+a≦1, 0<y<1 and 0≦z≦1 and M is at least one of Sc, Yb and La, improves emission color of phosphors of Y3(Al, Ga)5O12:Tb series, and in case that y=0.07, z=0.4 and a=0 in the foregoing composition, color y is increased with increasing Gd concentration, when Gd concentration x is changed, and the emission color becomes clear green.

Abstract: A two-wavelength band light emitting type fluorescent lamp the main light emission of which is obtained by fluorescent substances in which the ranges of the wavelength peak of light emission are located from 470 to 540 nm and from 600 to 650 nm.

Abstract: A rare-gas low-pressure discharge lamp for generating ultraviolet light, in particular for cosmetic or therapeutic purposes, has a discharge vessel which is filled with rare gas and is at least partly transparent to UV light and which is at least partly coated with a phosphor which radiates UV light upon excitation by an excitation radiation produced in the discharge vessel so as to utilize a desired spectral range.

Abstract: The invention relates to a signaling lamp with VUV phosphor excitation, in particular for traffic applications. It further relates to the use of phosphor mixtures for red, green and yellow signaling lamps and to a correspondingly constructed traffic light. (FIG. 1).

Abstract: An electric discharge lamp comprises a case with a transparent wall wherein the inner surface is coated with a luminescent material layer. The luminscent material is at least partially made up of a luminescent compound of general formula: Ba7-x-y Mx Euy F12 Xu Yv. In this formula, M is selected among calcium, magnesium, strontium and zinc; X and Y each represent an element selected among chlorine and bromine; x, u, and v range between 0 and 2, with u+v=2; and y ranges between 0.00001 and 2. The luminescent compound has high values of light output intensity, in the spectrum visible part, for excitation wavelengths higher than 300 nanometers. Thus it is possible to use an excitation radiation less actinic than in the case of discharge lamps of prior art, while avoiding the presence of mercury in the atmosphere contained in the case. The invention, therefore, makes it possible to decrease the dangerous physiological effects on living beings and to eliminate risk of mercury pollution.

Abstract: Provided with a phosphor for a fluorescent display that includes at least one divalent transition metal and at least two trivalent metal added to SrTiO3 and having a formula of: SrTi1−x−yMxNyO3:zPr3+ wherein M represents the divalent transition metal selected from the group consisting of Zn, Mn, Co, Ni, Cu and Cd, N represents the trivalent metal selected from the group consisting of Ga, Al, In and B, and 0≦x≦0.1, 0≦y≦0.1 and 0≦z≦0.1.

Abstract: A phosphor excited by a vacuum ultraviolet ray has composition substantially expressed by L1-xTbxAl3(BO3)4, or L1-x-yTbxCeyAl3(BO3)4 (L denotes at least one of element selected from Y and Gd, 0.1<x≦0.7, and 0.00001≦y≦0.01). The phosphor excited by a vacuum ultraviolet ray emits a strong green emission when irradiated with the vacuum ultraviolet ray of 200 nm or less in wavelength, and suitably applied to a light emitting apparatus such as a rare gas discharge lamp or a PDP using a vacuum ultraviolet ray as an exciting source.

Abstract: A low pressure mercury vapor discharge lamp is provided, said discharge lamp (10) comprising an envelope (12) formed from light-transmitting material and containing an ionizable gas fill (22), mercury, and electrodes (18) sealed in the envelope. The envelope (12) is provided with a single layer coating (14) on the internal surface thereof next to the discharge space. The coating (14) contains halo-phosphate phosphor and 5-30 mass % aluminum oxide relative to the halo-phosphate phosphor, and the primary particle size of the aluminum oxide is smaller than 30 nanometers, the floc size of the aluminum oxide is smaller than 1 micrometer, and the void fraction of the total floc volume is at least 50%.

Abstract: The present invention provides a plasma display panel in which the fluorescent substance layer or the reflection layer is formed easily and accurately even for a minute cell structure, and in which the fluorescent substance layer or the reflection layer is formed evenly in the channels between the partition walls formed in stripes, or such a layer is formed also on the sides of the partition walls. To achieve this purpose, a fluorescent substance layer or a reflection layer is formed by applying a fluorescent substance ink or a reflection material ink continuously onto the channels, the ink being spouted out from a nozzle which runs along the partition walls. The nozzle may be directed to one side of the plurality of partition walls while running. Pressure may be put upon the ink having been applied onto the channels so that the ink sticks to both sides of the partition walls.

Abstract: An electrodeless fluorescent lamp employs a glass envelope made from a single linear tube filled with inert gas and mercury vapor. Phosphor and protective coatings are disposed on the inner surface of the envelope walls. An induction coil of few turns made from silver coated copper or Litz wire is wrapped around the linear tube in its axial direction. The inductively-coupled axially uniform plasma is generated inside the linear tube. The discharge electric field and current form a closed-loop path inside a tube in its axial direction. The lamp is operated at frequencies from 100 KHz to 100 MHz and RF power from 10 W to 2000 W (dependent on lamp size and number of turns). The lamp power efficiency and efficacy are comparable to those in electrodeless lamps of closed-loop shape operated with and without ferrite core.

Abstract: A fluoride-based fluorescent material designated by a composition formula of MFn:R, wherein M is at least one element selected from the group consisting of rare earth elements, Al and Bi, alkaline earth metals, and alkaline metals, and R is a rare-earth-based activator including at least either Tb or Tb and Ce and n=1, 2 or 3. The fluoride-based fluorescent materials efficiently emit white-light of a luminescent peak at 543 nm.

Abstract: An electric lamp which is provided with an electric light source in a light-transmitting bulb provided with a coating comprising an inorganic colored pigment selected from the group formed by oxide nitride pigments of the general formula

Abstract: The object of the present invention is to provide a gas discharge display device having improved luminous efficiency by effectively using ultraviolet ray, which is absorbed in a partition wall or a protective film and the like without contributing to excitation of a fluorescent material. By adding gadolinium to the materials excluding the fluorescent material among structures surrounding the discharge cell, ultraviolet ray having a wavelength of 315 nm is generated, which can excite the fluorescent material. The ultraviolet ray excites the fluorescent material to generate visisble light, and then, electric-light conversion efficiency is improved.

Abstract: A red light emitting afterglow photoluminescence phosphor is a rare earth oxysulfide phosphor activated by Europium, which chemical formula is follows:

Abstract: A phosphor coating for gas discharge lamps is provided. The phosphor coating contains a nano-size phosphor which promotes adherence of the primary phosphor to the glass envelope. The phosphor coating is applied to the interior surface of the gas discharge lamp using an aqueous suspension containing the primary phosphor, the nano-size phosphor, and an organic binder.

Abstract: An escape light instrument using as its light source a fluorescent lamp, mainly derives its luminescence from luminophors the peak ranges of whose luminescent wavelength are from 530 to 580 nm and from 600 to 650 nm, said luminophors having 30 nm or less of half band width, wherein a luminous flux derived from a luminophor the peak range of whose luminescent wavelength is from 420 to 470 nm accounts for 4 to 10% of a total luminous flux in said main luminescent wavelength, and which permits categorical discrimination of at least green and white transmitted colors used on the sign face, and has a luminous color of 5 or more in Duv.

Abstract: Disclosed are a phosphor composition comprising an inorganic phosphor, capable of emitting blue color upon ultraviolet irradiation, and copper or a copper compound; a phosphor paste comprising the phosphor composition dispersed in a dispersing medium; and a photosensitive dry film formed from the phosphor paste.

Abstract: A fluorescent lamp, wherein a chromaticity value (x, y) of a light source color is in a range surrounded by a point A (0.251, 0.343), a point B (0.285, 0.332), a point C (0.402, 0.407) and a point D (0.343, 0.433), includes a phosphor blend in an inner face of a luminous tube, the phosphor blend comprising an antimony and manganese activated calcium halophosphate phosphor, a rare earth phosphor emitting green, and a rare earth phosphor emitting blue or red.

Abstract: A plasma picture screen provided with a luminescent layer which comprises a blue Eu2+-activated phosphor and a UV-C light emitting phosphor. The mixing of an UV-C light emitting phosphor with an Eu2+-activated phosphor or coating of an Eu2+-activated phosphor with a UV-C light emitting phosphor or coating of a base layer of an Eu2+-activated phosphor with a covering layer of a UV-C light emitting phosphor clearly reduces the photodegradation of the Eu2+-activated phosphors in the VUV range.

Abstract: A luminescence crystal particle which emits light upon irradiation with an energy beam and which has a crystal defect density of 5×107 defects/cm2 or less in a region located from the surface of the luminescence crystal particle to a portion as deep as the energy beam reaches.

Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+ , Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.

Abstract: A phosphor for a vacuum ultraviolet excited light emitting device, obtained by adding Eu or Tb as an activating agent to a substrate comprising a compound represented by the general formula M1M2M3O4, wherein M1 represents at least one elements selected from Na and Li, M2 represents at least one elements selected from Gd and Y, and M3 represents at least one elements selected from Ge and Si.

Abstract: A red emitting phosphor comprises a yttrium oxysulfide phosphor as a base material. A red emitting phosphor of medium particle size type has such a particle size distribution that a content of a component of a particle diameter of less than 4.0 &mgr;m is 15% or less, that of a component of a particle diameter of 4.0 &mgr;m or more and less than 8.0 &mgr;m is 75% or more, and that of a component of a particle diameter of 8.0 &mgr;m or more is 10% or less. A red emitting phosphor of larger particle size type has such a particle size distribution that the content of a component of a particle diameter of less than 5.04 &mgr;m is 20% or less, that of a component of a particle diameter of 5.04 &mgr;m or more and less than 10.079 &mgr;m is 70% or more, and that of a component of a particle diameter of 10.079 &mgr;m or more is 10% or less. Phosphor layers employing these red emitting phosphors are excellent in denseness. Accordingly, a cathode ray tube of high contrast and high quality can be provided.

Abstract: A plasma display panel comprising plural kinds of phosphor layers emitting different colors of fluorescent light, at least one kind of the phosphor layer being formed of a mixed phosphor obtained by mixing a phosphor having a surface potential with a negative polarity and a phosphor having a surface potential with a positive polarity. By using the mixed phosphor, the negative polarity of the surface potential is changed to the positive polarity, thereby reducing the discharge error and discharge variation, and improving the quality of display.

Abstract: The wavelength-converting casting composition is based on a transparent epoxy casting resin with a luminous substance admixed. The composition is used in an electroluminescent component having a body that emits ultraviolet, blue or green light. An inorganic luminous substance pigment powder with luminous substance pigments is dispersed in the transparent epoxy casting resin. The luminous substance is a powder of Ce-doped phosphors and the luminous substance pigments have particle sizes ≦20 &mgr;m and a mean grain diameter d50≦5 &mgr;m.

Abstract: A fluorescent lamp which produces primary light using a green emission phosphor with a peak emission wavelength at 530 nm to 560 nm and a red emission phosphor with a peak emission wavelength at 600 nm to 630 nm, is characterized in that, under illumination by said fluorescent lamp, four test colors for special color rendering index calculation, No. 9, No. 10, No. 11, and No. 12, specified in the Commission Internationale de l'Eclairage CIE Publication No. 13.3, are perceivable as red, yellow, green, and purplish blue, respectively, in terms of Munsell hues.

Abstract: Disclosed are a phosphor pattern which comprises a calcination product of a phosphor pattern precursor containing

Abstract: A fluorescent lamp includes a discharge tube with an ionizable filling which emits ultraviolet light when a discharge occurs, and an inside surface coated with a mixture of three phosphors which emit light in blue-green, green, and red wavelength ranges when exposed to the ultraviolet light. The green and red phosphors are conventional, for example LAP and YOX, while the blue-green phosphor is barium magnesium aluminate activated by europium and manganese (BBG). The BBG has spectra which are similar to those of conventional blue phosphors such as BAM or SCAP, but also emits in the green range from 500-540 nm and augments the LAP which is relatively low in this range.

Abstract: A lamp vessel is made from a material which absorbs short-wave UV radiation. In addition, the luminescent screen comprises cerium-activated lunthanum phosphate and a luminescent substance having an emission band whose maximum is situated in the wavelength range from 340 nm and whose half-value ranges between 35 nm and 80 nm. The emission spectrum of the lamp for wavelengths below 400 nm corresponds closely to the solar spectrum while the lamp also has a high erythema L light output.

Abstract: Photoluminescent phosphor powders and a method for making phosphor powders. The phosphor powders have a small particle size, narrow particle size distribution and are substantially spherical. The method of the invention advantageously permits the economic production of such powders. The invention also relates to improved devices, such as display devices and lighting elements, incorporating the phosphor powders.

Abstract: The invention relates to a luminescent material of general formula (BaxSr1−x−yPby)2Mg(BO3)2 wherein 0≦x≦0.999, 0.0005<y<0.05. Luminescent materials of this general formula are very suitable for use in low pressure mercury discharge lamps for tanning purposes.

Abstract: A warm white fluorescent lamp wherein the visual clarity index of said lamp is in a range from 121 to 145 inclusive, the correlated color temperature of its light color is in a range from 2700 K to 3150 K inclusive, and the chromaticity point of said light color is located within a chromaticity range where distance of chromaticity point from the Planckian locus on the CIE 1960 uv chromaticity diagram is not less than -0.005 and not greater than +0.005.

Abstract: A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 and from 600 to 650, with correlated color temperature of the lamp light color in a range from 1700 to 6500 and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.

Abstract: A luminescent material coated with a crystalline layer of a metal oxide M.sub.2 O.sub.3 wherein a metal M is chosen from the group formed by Y and Al is shown. According to this method the luminescent material is first introduced into a solution of a salt of the metal M, then a compound of the metal M is deposited on the luminescent material through homogeneous precipitation, and subsequently the luminescent material is separated from the solution, dried, and heated. It is achieved thereby that the luminescent material will absorb mercury to a low degree only, and that accordingly the color point of a low-pressure mercury discharge lamp whose luminescent layer comprises a luminescent material coated in accordance with the invention only shows a small shift as the lamp ages.

Abstract: A cation-treated silicate phosphor and fluorescent lamp made therefrom are provided wherein the 100 hour radiance maintenance is significantly improved. The cation treatment method involves adding an amount of a silicate phosphor to a salt solution containing a cation wherein the ratio of cation to phosphor in the solution is from about 1:2 to about 4:1 moles of cation to moles of phosphor. The solution is then stirred for a time sufficient to cause the cation to attach to the phosphor surface to form a cation-treated phosphor. The cation-treated phosphor is separated from the solution and annealed at a temperature and for a time sufficient to increase radiance maintenance of the cation-treated phosphor.

Abstract: Color rendering indices Ra,8 between 80 and 90 and R9 greater than 20, and a color point on or near the Planckian curve, are achieved with a lamp vessel provided with a luminescent screen including a first luminescent substance which emits predominantly between 520 nm and 565 nm, a second luminescent substance which emits predominantly between 590 nm and 630 nm, and a third luminescent substance which emits predominantly in the range between 615 nm and 780 nm.

Abstract: Luminescent phosphor compositions comprising thulium doped lanthanum aluminates are disclosed. In one aspect of the invention, a luminescent phosphor composition comprises:(La.sub.1-x-z Tm.sub.x Al.sub.y R.sub.z O.sub.3/2(y+1)-m/2) Cl.sub.mwhere R is at least one of Tb.sup.3+, Ga.sup.3+, and Ce.sup.3+ ; 0.001.ltoreq.x.ltoreq.0.05; 0.5.ltoreq.y.ltoreq.3; 0.ltoreq.z.ltoreq.0.05; and 0.ltoreq.m.ltoreq.0.05. In another aspect, a luminescent phosphor composition consists essentially of such material. Such materials are advantageously used in displays such as field emission displays, and particularly high electron density field emission and other displays.

Abstract: A luminescent material of general formulaLn.sub.y/3 Na.sub.x-y (Al.sub.x Si.sub.192-x O.sub.384)(MO.sub.3).sub.zwherein 0<x<96, 0<y<96, y<x and z<20, and Ln comprises one or more elements chosen from the group formed by Sc, Y, La and the Lanthanides and wherein M comprises one or more elements chosen from the group formed by Mo, W, V, Nb and Ta. Luminescent materials of this general formula are relatively cheap and are very suitable for use in low pressure mercury discharge lamps of the three band type.

Abstract: A phosphor capable of being reduced in activity of a surface thereof, to thereby minimize adsorption of gas thereon, release of gas therefrom and the like, to thereby ensure protection of the surface. The phosphor of the present invention is coated with a diamond-like carbon (DLC) film. Such coating reduces an activity of a surface of the phosphor. Also, the phosphor may be used for a display section of a display device. This permits durability of the phosphor to be increased and prevents a deterioration of a cathode, resulting in the display device being increased in durability.

Abstract: A neon discharge lamp provided with a powder coating with an appropriate particle size of used powder, is applied on an inner surface of a tubular bulb to the extent nearly equal to or more the length of an electrode portion, along the longitudinal axis of said tubular bulb. The phenomenon of neon gas being encompassed by way of cathode sputtering is prevented and the shortened operating life of the neon discharge lamp of this kind by way of cathode sputtering is also prevented.

Abstract: The present invention provides a plasma display panel, comprising a rear substrate provided with ribs defining discharge cells, address electrodes and phosphor layers, and a front substrate provided with transparent electrodes extending in a direction perpendicular to the address electrodes, a transparent dielectric layer and a protective layer, discharge being brought about within the discharge cell formed between the rear substrate and the front substrate to excite the phosphor contained in the phosphor layer so as to cause the phosphor to emit a visible light. In this plasma display panel, the phosphor particles forming the phosphor layer have an average particle size of 0.1 to 5 .mu.m and a ratio of the largest curvature to the smallest curvature of at most 1.5. Also, the magnitude of the irregularities on the surface of the phosphor particle is at most 5% of the diameter of the phosphor particle.

Abstract: The present invention provides a phosphor capable of improving color purity and the light emitting efficiency of a plasma display panel (PDP), and provides the plasma display panel (PDP) using this phosphor. The phosphor of the present invention is characterized in that this phosphor is represented by a general formula (Y.sub.1-a-b Gd.sub.a Eu.sub.b).sub.2 O.sub.3 wherein a and b satisfy 0<a.ltoreq.0.90, 0.01.ltoreq.b.ltoreq.0.20. The plasma display panel of the present invention is characterized in that the plasma display panel comprises a light emitting layer 5 including the above phosphor 4.

Abstract: Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 .mu.m and a ratio of the major diameter to the minor meter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 .mu.m less in an amount of 5 wt % or less.