Including Particular Phosphor Patents (Class 313/486)
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Publication number: 20030137234Abstract: The plasma display panel of the present invention has, for achieving high luminance and high reliability, a plurality of discharge spaces formed between a front panel and a back panel that are disposed to oppose each other, and phosphor layers, formed in the discharge spaces, each including phosphor particles of one of blue, red and green colors, wherein the phosphor particles of at least one of blue, red and green colors included in the phosphor layer are flake-like particles.Type: ApplicationFiled: November 14, 2002Publication date: July 24, 2003Inventors: Masaki Aoki, Hiroyuki Kado, Shigeo Suzuki, Hiroyuki Kawamura, Mitsuhiro Ohtani
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Patent number: 6596196Abstract: An improved material in the form of rare-earth borate, its precursor(s) and a luminophore made thereof is provided. The material is characterizable as comprising spherical, cubic or parallelepipedal particles having an average particle size not more than 10 &mgr;m, over a narrow particle size distribution (dispersion index not greater than 0.8). The material may comprise a rare earth element having that lacks luminescence in combination with a dopant.Type: GrantFiled: December 22, 2000Date of Patent: July 22, 2003Assignee: Rhodia ChimieInventors: Denis Huguenin, Pierre Macaudiere
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Patent number: 6597104Abstract: A lanthanum phosphate phosphor for vacuum ultraviolet radiation, which is represented by a composition formula of (La1-x-yCexTby)PO4, wherein x and y are numbers which satisfy 0≦x≦0.2 and 0.05≦y≦0.3, respectively, and which emits light when irradiated with vacuum ultraviolet radiation having a wavelength of at most 200 nm.Type: GrantFiled: January 16, 2002Date of Patent: July 22, 2003Assignee: Kasei Optonix, Ltd.Inventor: Reiji Otsuka
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Patent number: 6592780Abstract: 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.Type: GrantFiled: April 25, 2001Date of Patent: July 15, 2003Assignee: Osram Opto Semiconductors GmbHInventors: Klaus Höhn, Alexandra Debray, Peter Schlotter, Ralf Schmidt, Jürgen Schneider
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Patent number: 6590333Abstract: 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.Type: GrantFiled: September 29, 2000Date of Patent: July 8, 2003Assignee: Hitachi, Ltd.Inventors: Teruki Suzuki, Masatoshi Shiiki, Choichiro Okazaki, Tadashi Furukawa
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Patent number: 6585912Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.Type: GrantFiled: July 2, 2001Date of Patent: July 1, 2003Assignee: Kasei Optonix, Ltd.Inventors: Kouhei Matsuda, Akihiro Ohto, Takayuki Hisamune
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Publication number: 20030107318Abstract: The plasma display panel of the present invention has, for achieving high luminance and high reliability, a plurality of discharge spaces formed between a front panel and a back panel that are disposed to oppose each other, and phosphor layers, formed in the discharge spaces, each including phosphor particles of one of blue, red and green colors, wherein the phosphor particles of at least one of blue, red and green colors included in the phosphor layer are flake-like particles.Type: ApplicationFiled: November 14, 2002Publication date: June 12, 2003Inventors: Masaki Aoki, Hiroyuki Kado, Shigeo Suzuki, Hiroyuki Kawamura, Mitsuhiro Ohtani
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Patent number: 6576157Abstract: A vacuum ultraviolet ray-excited light-emitting phosphor comprising a compound represented by formula (BaxM1−x)1−0.25yMg1−yAl10+yO17+0.25y as a substrate, and Eu as an activator, wherein M represents Ca, Sr, or Ca and Sr, x and y satisfy the following relations, 0.5≦x≦1, and 0.05≦y≦0.15.Type: GrantFiled: March 28, 2001Date of Patent: June 10, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Keiji Ono, Susumu Miyazaki
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Publication number: 20030102797Abstract: A phosphor powder is composed of a host material made of an element coming under the group II of the periodic table and an element coming under the group VI of the periodic table, an activator and a co-activator, the amount ratio of the activator to the host material is 1×10−4 to 1×10−3 parts by weight when the amount ratio of the host material is 1 part by weight, and the co-activator has a molar concentration equal to a molar concentration of the activator.Type: ApplicationFiled: November 1, 2002Publication date: June 5, 2003Inventor: Kazuo Kajiwara
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Publication number: 20030094889Abstract: The present invention provides a green emitting phosphor which includes an excess of the ordinary SiO2 component included in parent material Y2-2xSiO5 activated by Tb in terms of stoichiometric ratio.Type: ApplicationFiled: June 27, 2002Publication date: May 22, 2003Inventors: Shin Imamura, Masatoshi Shiiki, Masaaki Komatsu, Hidetsugu Matsukiyo, Yoshihiro Koseki, Takashi Hase, Tsutomu Yamada
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Patent number: 6555963Abstract: Low-pressure mercury vapor discharge lamp provided with a discharge vessel (10). The discharge vessel (10) encloses a discharge space (11), provided with a filling of mercury and a rare gas, in a gastight manner. At least a part of an inner surface of the discharge vessel (10) is provided with a transparent layer (16) comprising an oxide of scandium, yttrium, or a rare earth metal (lanthanum, cerium, gadolinium, ytterbium, and/or lutetium). The discharge lamp is characterized in that the transparent layer (16) comprises a borate or a phosphate of an alkaline earth metal and/or of scandium, yttrium or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium and/or barium. The further rare earth metal is preferably lanthanum, cerium and/or gadolinium. The oxide is preferably Y2O3 or Gd2O3. Preferably, the transparent layer (16) has a thickness of between 5 nm and 200 nm. A luminescent layer (17) is preferably provided on top of the transparent layer in the discharge vessel.Type: GrantFiled: November 9, 1999Date of Patent: April 29, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Ingrid J. M. Snijkers-Hendrickx, Volker D. Hildenbrand, Johannes H. Roes
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Publication number: 20030076029Abstract: The phosphor composition for low-pressure gas discharge lamps with a high light efficiency for generating radiation with a color temperature of greater than 5000 K and a very good general color rendering index Ra of greater than 90 includes at least one halophosphate phosphor, a phosphor which emits in the red wavelength region and a phosphor which emits in the blue-green wavelength region. In addition, according to the invention the phosphor composition contains an Eu-doped barium magnesium aluminate phosphor BaMgAl10O17:Eu and a Tb-doped green-emitting phosphor.Type: ApplicationFiled: October 17, 2002Publication date: April 24, 2003Applicant: PATENT-TREUHAND-GESELLSCHAFT FUR ELEKTRISCH GLUHLAMPEN MBHInventors: Wolfgang Gruber, Matthias Schiplage, Martin Zachau
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Patent number: 6552487Abstract: The phosphor according to the invention has the following composition: (RE1−x−yPrxCey)3(Al,Ga)5O12, where RE=Y, Sc, Tb, Gd, La and/or Lu; 0.00001<x<0.05; 0.01<y<0.2.Type: GrantFiled: October 23, 2000Date of Patent: April 22, 2003Assignee: Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbHInventors: Andries Ellens, Franz Zwaschka
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Publication number: 20030071560Abstract: A field-emission display apparatus includes a faceplate on which a phosphor layer is formed, and a means for irradiating electron beam onto the phosphor layer and the phosphor layer is constituted by phosphors formed by mixing main phosphors with small particle phosphors, the averaged particle diameter of which is smaller than ½ of an averaged particle diameter of the main phosphors, enhancing the filing density of the phosphor layer and also enhancing both a lifetime characteristic and a luminescent characteristic of the phosphor layer.Type: ApplicationFiled: June 20, 2002Publication date: April 17, 2003Applicant: Hitachi, Ltd.Inventors: Masaaki Komatsu, Masatoshi Shiiki, Shin Imamura
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Publication number: 20030057824Abstract: A new fluidized bed particle coating method is disclosed by the use of which coatings can be uniformly and conveniently deposited on the surfaces of fluidized particulate materials by vapor deposition processes at temperatures lower than those of the heated coating precursor transport lines. By this method, particle materials with relatively low surface temperatures may be brought into close proximity with a coating precursor containing gas stream characterized by a substantially higher gas volume temperature in such a way that the vaporized precursor molecules are caused to adsorb or condense on the relatively cold particle surfaces without also condensing on any other surface. Further, if the adsorbed precursor molecules are capable of reacting or polymerizing on the relatively cold particle surfaces, thus forming substantially continuous coatings on those surfaces, they may do so without also depositing such coatings on any other surfaces.Type: ApplicationFiled: September 27, 2001Publication date: March 27, 2003Inventors: Keith A. Klinedinst, Christoforos Kazazis, Daniel Carril
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Patent number: 6538372Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of three phosphors, namely, Barium Magnesium Aluminate, Cerium Gadolinium Magnesium Borate, and Calcium Halophosphor.Type: GrantFiled: December 18, 2000Date of Patent: March 25, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Kelly S. Vose, Brett A. Carter, Emmanuel W. J. L. Oomen
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Patent number: 6538371Abstract: There is provided a white light illumination system including a blue LED and a luminescent material. The system color output is improved when a line connecting the LED color coordinates and the luminescent material color coordinates approximates the Black Body Locus on the CIE chromatically diagram. The LED may have a peak emission wavelength between 470 and 500 nm. The luminescent material may be (Y1−x−zGdxCez)3Al5O12, where 0.7>x>0.4 and 0.1>z>0.Type: GrantFiled: March 27, 2000Date of Patent: March 25, 2003Assignee: The General Electric CompanyInventors: Anil Raj Duggal, Alok Mani Srivastava, Holly Ann Comanzo
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Patent number: 6531074Abstract: A luminescent nanophase binder is provided for use in UV and VUV applications. The binder promotes adherence of phosphor coatings to lamp envelopes and emits visible light under UV and VUV excitation. In a preferred embodiment, the binder comprises SiO2 nanoparticles doped with terbium or terbium and yttrium. Preferably, the nanoparticles have a particle size of less than 50 nm.Type: GrantFiled: January 8, 2001Date of Patent: March 11, 2003Assignee: Osram Sylvania Inc.Inventors: Cathy Shaw Trumble, Mary Ann Johnson
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Patent number: 6528938Abstract: A mercury vapor discharge fluorescent lamp is provided having a single composite phosphor-containing layer. The composite layer contains both a heterogeneous mixture of halophosphors, rare earth triphosphors and colloidal alumina particles. The coating weight and relative proportion of halophosphors to triphosphors are both tunable to obtain a lamp having specific performance characteristics suitable to a particular application. The colloidal alumina particles contained in the composite layer eliminate the need for a separately applied alumina layer as is conventional in the prior art.Type: GrantFiled: October 23, 2000Date of Patent: March 4, 2003Assignee: General Electric CompanyInventor: Jon B. Jansma
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Patent number: 6527978Abstract: A phosphor for a vacuum ultraviolet ray-exciting light-emitting element, comprising Eu as an activator, and aluminates having a magnetoplumbite structure.Type: GrantFiled: February 26, 2001Date of Patent: March 4, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Kyota Ueda, Tadashi Endo, Keiji Ono, Susumu Miyazaki
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Patent number: 6525460Abstract: A high color-rendering fluorescent lamp comprising a phosphor layer wherein the phosphors are selected such that the general color rendering index, Ra is greater than 96 or 97 or 98 at color temperatures of 2700 K to 6600 K, and all the special color rendering indices are greater than 90 at color temperatures of 2900 K to 6500 K.Type: GrantFiled: August 30, 2000Date of Patent: February 25, 2003Assignee: General Electric CompanyInventors: Thomas F. Soules, Pak K. Yuet
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Publication number: 20030034729Abstract: A phosphor thin film made of a matrix material comprising an alkaline earth sulfide and a luminescence center and having a thickness of 50-300 nm emits light, especially red light, of a good color purity at a high luminance and in a good response and enables to produce an EL panel.Type: ApplicationFiled: October 4, 2001Publication date: February 20, 2003Applicant: TDK CORPORATIONInventors: Yoshihiko Yano, Tomoyuki Oike
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Publication number: 20030015955Abstract: The luminance of phosphor is enhanced by forming a phosphor screen of a fluorescence generation unit by phosphor expressed by the following composition formula and a display using a white light the luminescent color of which is improved and which has an excellent characteristic is acquired.Type: ApplicationFiled: February 14, 2002Publication date: January 23, 2003Inventors: Masatoshi Shiiki, Choichiro Okazaki, Teruki Suzuki, Shin Imamura, Masaaki Komatsu, Hiromichi Yamada
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Patent number: 6509685Abstract: A plasma display screen including a carrier plate, a transparent front plate, a ribbed structure which divides the space between the carrier plate and the front plate into plasma cells, which are filled with a gas, and including one or more electrode arrays for generating corona discharges in the plasma cells, and including a phosphor layer which includes a phosphor for generating red radiation selected from the group formed by rare earth metal borates of the general formula EA M11-x-yM2xEuyB9O16, where EA=Ca, Sr, Ba; M1=Gd, La; M2=Y, Lu, Sc, In and 0<x≦0.5, 0.01≦y≦0.4, and M31-r-sYrEusBO3, where M3=Sc,, In, Lu and 0.01≦r≦0.99, 0.01≦s≦0.15, is characterized by a red point which has shifted in the direction of a higher color saturation. In addition, the color contrast at brighter ambient lighting conditions is increased.Type: GrantFiled: October 27, 2000Date of Patent: January 21, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Jüstel, Hans Nikol, Helmut Bechtel, Cornelis Reinder Ronda
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Publication number: 20030006694Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue-luminescing Blue Halophosphate (BH), red-luminescing Yittrium Oxide (YOX), 2900K-luminescing Calcium Halophosphate, also referred to as Warm White Halophosphate (WW), and green-luminescing Zinc Silicate (ZS).Type: ApplicationFiled: June 26, 2001Publication date: January 9, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventor: Brett A. Carter
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Publication number: 20020195922Abstract: The invention relates to a gas discharge lamp for dielectrically impeded discharges, which gas discharge lamp comprises a discharge vessel filled with a gas filling, which discharge vessel comprises at least one wall of a dielectric material and at least one wall having a surface which is at least partly transparent to visible radiation, and a phosphor layer containing a blue phosphor with a host lattice and Nd3+ as the activator, electrodes for a dielectrically impeded discharge and means for igniting and maintaining the discharge.Type: ApplicationFiled: June 24, 2002Publication date: December 26, 2002Inventors: Thomas Juestel, Walter Mayr, Detlef Uwe Wiechert, Hartmut Lade
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Publication number: 20020195587Abstract: A rare earth-activated terbium-containing garnet phosphor is capable of absorbing radiation in the range from near UV to blue and emitting a broad spectrum of visible light in the range from about 490 nm to about 770 nm. The emission of the phosphor under an excitation at 450 nm exhibits a peak in the range of maximum sensitivity of the human eye. A light source combining a UV/blue LED and this phosphor can provide a white light that is on or near the Planckian locus and may be useful for general illumination.Type: ApplicationFiled: June 1, 2001Publication date: December 26, 2002Inventors: Alok Mani Srivastava, Anant Achyut Setlur, Holly Ann Comanzo
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Publication number: 20020190634Abstract: A phosphor represented by the formula (1−x)CaO·xEu(O)·yMgO·nSiO2, wherein x, y and n represent number of moles, respectively. A fluorescent lamp comprising the above phosphor. The phosphor has stronger luminous intensity and less luminous intensity reduction after a long lighting hours.Type: ApplicationFiled: March 21, 2002Publication date: December 19, 2002Inventors: Hisashi Yoshida, Maki Minamoto, Kazuya Ito, Yosuke Nishikage
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Publication number: 20020185960Abstract: Strontium, calcium, strontium calcium, strontium calcium magnesium, calcium magnesium aluminates, and strontium borates activated with Pr3+ exhibit characteristics of quantum-splitting phosphors under VUV excitation. A large emission peak at about 405 nm under VUV excitation is used conveniently to identify quantum-splitting phosphors. Improvements may be achieved with addition of fluorides or boric acid as a flux during the preparation of the phosphors. It is also possible to predict improvement in quantum efficiency by observing the ratio of emission intensities at about 480 nm and about 610 nm.Type: ApplicationFiled: May 18, 2001Publication date: December 12, 2002Inventors: Anant Achyut Setlur, Alok Mani Srivastava
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Publication number: 20020185961Abstract: A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling is suitable for a gas discharge which emits VUV radiation, with a luminophore coating containing a down conversion luminophore and with means for igniting and maintaining a gas discharge, in which the down conversion luminophore has in a host lattice a pair of activators of a first lanthanoid ion and a second lanthanoid ion and a co-activator of a third lanthanoid ion, is environmentally friendly and has a very a good lamp efficiency.Type: ApplicationFiled: April 25, 2002Publication date: December 12, 2002Inventors: Koert Oskam, Paul Peijzel, Andries Meijerink, Claus Feldmann
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Publication number: 20020180351Abstract: UV reflectors incorporated in UV LED-based light sources reduce the amount of UV radiation emission into the surroundings and increase the efficiency of such light sources. UV reflectors are made of nanometer-sized particles having a mean particle diameter less than about one-tenth of the wavelength of the UV light emitted by the UV LED, dispersed in a molding or casting material surrounding the LED. Other UV reflectors are series of layers of materials having alternating high and low refractive indices; each layer has a physical thickness of one quarter of the wavelength divided by the refractive index of the material. Nanometer-sized textures formed on a surface of the multilayered reflector further reduce the emission of UV radiation into the surroundings. UV LED-based light sources include such a multilayered reflector disposed on an encapsulating structure of a transparent material around a UV LED, particles of a UV-excitable phosphor dispersed in the transparent material.Type: ApplicationFiled: April 30, 2001Publication date: December 5, 2002Inventors: Thomas Francis McNulty, Daniel Darcy Doxsee, James Wilson Rose
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Publication number: 20020180339Abstract: A process for recovering rare-earth phosphors from an interior of a lamp envelope (12). The interior of the envelope defines a wall and a base layer (14) is adhered to the wall. A coating layer (16) having the rare-earth phosphors is adhered to the base layer. The process includes flowing a gas through the envelope at a rate sufficient to remove particles of the coating layer but not the base layer. The process also includes collecting the particles of the coating layer, the particles containing the rare-earth phosphors. Lamp envelopes (12) having a base layer (14) and a phosphor coating layer (16) suitable for use with the recycling method are also discussed.Type: ApplicationFiled: July 24, 2002Publication date: December 5, 2002Applicant: GENERAL ELECTRIC COMPANYInventor: Jon B. Jansma
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Patent number: 6489716Abstract: A compact energy lamp having high luminous flux, long life and a very similar color temperature of between 2300° K and 6500° K which includes a vacuum-type discharge vessel filled with mercury and a noble gas. The inside of the discharge vessel is provided with a luminescent layer and is provided with means for maintaining discharge. The luminescent layer includes two phosphors. The first phosphor is a green-emitting gadolinium magnesium borate silicate, activated with cerium and terbium, and the second phosphor is yttrium oxide: Eu3+, which emits in the red spectral region.Type: GrantFiled: October 14, 1999Date of Patent: December 3, 2002Inventors: Walter Tews, Gundula Roth, Ina Fethke, Jens Klimke
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Publication number: 20020171356Abstract: Strontium and strontium calcium aluminates and lanthanum and lanthanum magnesium borates activated with Pr3+ and Mn2+ exhibit characteristics of quantum-splitting phosphors. Improved quantum efficiency may be obtained by further doping with Gd3+. Refined rules for designing quantum-splitting phosphors include the requirement of incorporation of Gd3+ and Mn2+ in the host lattice for facilitation of energy migration.Type: ApplicationFiled: May 18, 2001Publication date: November 21, 2002Inventors: Anant Achyut Setlur, Holly Ann Comanzo, Alok Mani Srivastava
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Patent number: 6483234Abstract: A single-component ARTIC BRITE™ phosphor and a low pressure discharge lamp utilizing such a phosphor is provided having a lamp envelope 3 having an inner surface 15, means 5,6,7,9,13 within the lamp envelope for generating ultraviolet radiation; and a layer 17 of a luminescent material adjacent the inner surface of the lamp envelope for generating visible light when impinged by the ultraviolet radiation. The phosphor material is at least one layer of a single-component ARTIC BRITE™ calcium, halophosphate phosphor having CIE color coordinates of X=346 and Y=359 and a CRI of at least 69, preferably a calcium halophosphate having the formula Ca5−x−ySbxMny(PO4)3ClzF1−x−z, wherein x is from about 0.032 to 0.037; y is from about 0.06 to 0.14; and z is about 0.025 to 0.05. The phosphor is derived from low cost, mined calcium carbonate, employing reactants in the following ratios: based on six phosphate atoms) about 0.142 manganese carbonate, about 0.Type: GrantFiled: August 30, 2000Date of Patent: November 19, 2002Assignee: Koninklijke Philips Electronics N.V.Inventor: Peter Milewski
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Patent number: 6479936Abstract: Improved lamp of the type comprising the crystal bulb of an incandescent lamp or the crystal tube of a fluorescent lamp or preferably of the type comprised of a tube-shaped fluorescent lamp, characterized in that the structure of the tube itself forms a support for a luminescent product arranged as a coating which captures the light proceeding from a source and generated by the lamp itself thereby enabling it to emit its own light after the excitation has stopped thereby providing a self-contained lighting element.Type: GrantFiled: April 28, 2000Date of Patent: November 12, 2002Inventor: Jorge Matarrodona Martinez
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Publication number: 20020160226Abstract: The invention relates to a plasma picture screen provided with a phosphor layer (9) which comprises an intrinsically pigmented phosphor. The plasma picture screen has an improved value for the luminance contrast performance without the efficiency of the phosphors being detracted from.Type: ApplicationFiled: January 29, 2002Publication date: October 31, 2002Inventors: Thomas Juestel, Hans-Helmut Bechtel, Walter Mayr
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Publication number: 20020158565Abstract: Phosphor blends are disclosed that are capable of absorbing electromagnetic ation having wavelengths in the range from about 315 nm to about 480 nm. O25:Eu2+,(Sr,Ba,Ca)5(PO4)3(Cl,OH):Eu2+,(Ba,Ca,Sr)2MgAl16O27: Eu2+, and (Ba,Ca,Sr)2MgAl16O27:Eu2+,Mn2+. White light sources are obtained by lying a phosphor blend over at least one LED that is capable of emitting electromagnetic radiation in the above-noted wavelength range.Type: ApplicationFiled: April 27, 2001Publication date: October 31, 2002Inventors: Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Daniel Darcy Doxsee
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Patent number: 6472812Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue luminescing Blue Halophosphor (BH), red-luminescing Yittrium Oxide (YOX), 3000K-luminescing Calcium Halophosphor, also referred to as Warm White (WW) and green-luminescing Zinc Silicate (ZS).Type: GrantFiled: December 18, 2000Date of Patent: October 29, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Kelly S. Vose, Brett A. Carter, Emmanuel W. J. L. Oomen
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Patent number: 6469434Abstract: Willemite (Zn2SiO4:Mn) is doped with one or more ions selected from the group formed by Gd3+, Eu2+, Co2+, Ce3+, Pr3+, Nd3+, Sm3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+ and Yb3+. This results in a increase in absorption and quantum yield and a decrease of the decay time.Type: GrantFiled: November 10, 1999Date of Patent: October 22, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Helmut Bechtel, Thomas Jüstel, Walter Mayr, Hans Nikol, Cornelis R. Ronda
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Patent number: 6466135Abstract: There is provided a blue-green illumination system, comprising a light emitting diode, and at least one luminescent material having at least two peak emission wavelengths, wherein the emission CIE color coordinates of the at least two peak emission wavelengths are located within an area of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: e) x=0.0137 and y=0.4831; b) x=0.2240 and y=0.3890; c) x=0.2800 and y=0.4500; g) x=0.2879 and y=0.5196; and h) x=0.0108 and y=0.7220. The illumination system may be used as the green light of a traffic signal. The luminescent material may be a blend of (Ba1-xEux)Mg2Al6O27 (“BAM”) and (Ba1-xEux)Mg2-yMnyAl16O27 (“BAMMn”) phosphors, where 0<x≦0.2 and 0<y≦0.5.Type: GrantFiled: May 15, 2000Date of Patent: October 15, 2002Assignee: General Electric CompanyInventors: Alok Mani Srivastava, Thomas Francis McNulty, Holly Ann Comanzo
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Publication number: 20020145379Abstract: A phosphor having longer lifespan which includes sulfur and has a perovskite structure.Type: ApplicationFiled: December 27, 2001Publication date: October 10, 2002Applicant: Samsung SDI Co., Ltd.Inventors: II Yu, Sang-Hyuk Lee, Young-chul You, Kyu-chan Park
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Patent number: 6462473Abstract: A plasma picture screen is provided with a front plate, which comprises a glass plate on which a dielectric layer and a protective layer are provided, with a carrier plate provided with a phosphor layer comprising a red and a blue phosphor as well as a green, Tb3+-activated phosphor, with a ribbed structure that subdivides the space between the front plate and the carrier plate into plasma cells filled with a gas comprising xenon, and with one or several electrode arrays on the front plate and the carrier plate for generating corona discharges in the plasma cells. The gas comprises xenon in a proportion of between 5 and 30% by volume.Type: GrantFiled: May 18, 2001Date of Patent: October 8, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Juestel, Gerhard Spekowius, Sybrandus Van Heusden, Gerrit Oversluizen, Siebe Tjerk De Zwart
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Patent number: 6452324Abstract: A fluorescent lamp particularly adapted for illuminating food, such as in a grocery store, particularly meat. The phosphor-containing layer in the lamp has two phosphors, a broad-band red-emitting phosphor having a peak between 610 and 645 nm, and a broad-band blue-green-emitting phosphor having a peak between 465 and 495 nm. The preferred phosphors are (Sr,Mg,Ca)3(PO4)2:Sn2+ and Ca5(PO4)3F:Sb3+. The lamp also has substantially reduced UV radiation.Type: GrantFiled: August 30, 2000Date of Patent: September 17, 2002Assignee: General Electric CompanyInventors: Thomas F. Soules, Pak K. Yuet
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Publication number: 20020121855Abstract: A phosphor compliant with formula (1) below and a perovskite structure containing samarium (Sm):Type: ApplicationFiled: December 26, 2001Publication date: September 5, 2002Applicant: SAMSUNG SDI CO., LTD.Inventors: Young-chul You, Kyu-chan Park, Sang-Hyuk Lee, Il Yu
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Patent number: 6445119Abstract: A discharge lamp which radiates visible light having the following lights combined: light having an emission peak in 400 to 490 nm wavelength range in a blue spectral region; light having an emission peak in a 500 to 550 nm wavelength range in a green spectral region; and light having an emission peak in 600 to 670 nm wavelength range in a red spectral region. The color point of the radiated light lies within a region common to the following regions: a region bounded by an ellipse with a color point (u, v)=(0.224, 0.330) as a center thereof, a major axis of 0.056, a minor axis of 0.024, and an angle from the u axis of 20 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)=(0.224, 0.330) as a center thereof, a major axis of 0.078, a minor axis of 0.014, and an angle from the u axis of 30 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)=(0.235, 0.335) as a center thereof, a major axis of 0.Type: GrantFiled: March 8, 1999Date of Patent: September 3, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshio Mori, Hiromi Tanaka, Kenji Mukai, Toru Higashi, Tetsuji Takeuchi, Haruo Shibata, Sueko Kanaya, Katsuaki Iwama
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Publication number: 20020117966Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue luminescing Blue Halophosphor (BH), red-luminescing Yittrium Oxide (YOX), 3000K-luminescing Calcium Halophosphor, also referred to as Warm White (WW) and green-luminescing Zinc Silicate (ZS).Type: ApplicationFiled: December 18, 2000Publication date: August 29, 2002Inventors: Kelly S. Vose, Brett A. Carter, Emmanuel W.J.L. Oomen
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Publication number: 20020113554Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of three phosphors, namely, blue luminescing Blue Halophosphor (BH), red-luminescing Cerium Gadolinium Magnesium Borate (CBTM), and 3000K-luminescing Calcium Halophosphor, also referred to as Warm White (WW).Type: ApplicationFiled: December 18, 2000Publication date: August 22, 2002Inventors: Kelly S. Vose, Emmanuel W.J.L. Oomen, Brett A. Carter
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Patent number: 6436313Abstract: There is provided a halophosphate phosphor having the formula (Ca, Mg, Ba, Sr, Zn)5(PO4)3(F, Cl, Br): Sb3+, Mn2+ doped with at least one rare earth ion which has a higher charge carrier capture cross section than the phosphor lattice defects. The rare earth ion preferentially traps charge carriers and thus decreases the density of color centers. The rare earth ions are preferably trivalent ions selected from Eu3+, Sm3+, Yb3+, Tm3+, Ce3+, Tb3+ and Pr3+.Type: GrantFiled: October 26, 2000Date of Patent: August 20, 2002Assignee: General Electric CompanyInventors: Alok Mani Srivastava, William Winder Beers, Thomas Frederick Soules, Holly Ann Comanzo
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Patent number: 6426589Abstract: A luminescent material is dispersed in a watery solution of sodium polyphosphate, a watery solution of a nitrate of the metal M is added, after which the luminescent material is separated, dried and fired. The metal is chosen from the group consisting of Ca, Sr, and Ba, whereby a protective layer of metal polyphosphate is formed on the luminescent material.Type: GrantFiled: August 25, 1999Date of Patent: July 30, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Jüstel, Hans Nikol, Walter Mayr, Cornelis R. Ronda