Rare Earth Patents (Class 313/468)
  • Patent number: 10160905
    Abstract: An object of the invention is to provide a blue-green light-emitting phosphor having excellent high-temperature property and excellent light-emitting properties such as brightness and half width. The phosphor is constituted of a plurality of alkaline earth metal elements including a barium element, phosphoric acid and a halogen element, and Eu as an activator, in which the molar ratio of the barium element to the total content of the alkaline earth metal elements is larger than 60% and smaller than 95%, and upon irradiation with a near-ultraviolet ray, the blue-green light-emitting phosphor is excited to thereby emit blue-green visible light.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: December 25, 2018
    Assignee: DYDEN CORPORATION
    Inventor: Chengzhou Li
  • Patent number: 8830416
    Abstract: Provided is a liquid crystal display device including a liquid crystal display panel, a fluorescent tube, a holder for retaining the fluorescent tube, and a frame to which the holder is attached. The holder includes an attachment portion for attaching to the frame, and a retaining portion for the fluorescent tube, the retaining portion extending from the attachment portion and facing the frame in a non-contact manner. The retaining portion and the frame have a space formed therebetween.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: September 9, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hiroshi Obata, Shimon Itakura, Tadatomo Akutsu, Takashi Kato
  • Patent number: 8704244
    Abstract: In order to provide an LED light emitting device that can easily control a color temperature of white light, the LED light emitting device is provided with a plurality of types of light emitting parts that: respectively have LED elements that emit ultraviolet radiation or violet color visible light, and phosphors that absorb the ultraviolet radiation or violet color visible light to emit colored light; and emit the colored light, wherein: the colored light emitted by the plurality of types of light emitting parts become white light when all mixed with each other; the LED elements of the plurality of types of light emitting parts are all the same ones, and mounted on a single base material; and two or more light emitting parts overlap with each other in their parts.
    Type: Grant
    Filed: February 5, 2010
    Date of Patent: April 22, 2014
    Assignee: CCS, Inc.
    Inventors: Hirokazu Suzuki, Jun Konishi, Yuichiro Tanaka, Kenji Yoneda
  • Patent number: 8329060
    Abstract: Embodiments of the present techniques provide a related family of phosphors that may be used in lighting systems to generate blue or blue-green light. The phosphors include systems having a general formula of: ((Sr1?zMz)1?(x+w)AwCex)3(Al1?ySiy)O4+y+3(x?w)F1?y?3(x?w) (I), wherein 0<x?0.10, 0?y?0.5, 0?z?0.5, 0?w?x, A is Li, Na, K, Rb, or Ag or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. Advantageously, phosphors made accordingly to these formulations maintain emission intensity across a wide range of temperatures. The phosphors may be used in lighting systems, such as LEDs and fluorescent tubes, among others, to produce blue and blue/green light. Further, the phosphors may be used in blends with other phosphors, or in combined lighting systems, to produce white light suitable for illumination.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: December 11, 2012
    Assignee: General Electric Company
    Inventors: Anant Achyut Setlur, Ramachandran Gopi Chandran, Claire Susan Henderson, Pransanth Kumar Nammalwar, Emil Radkov
  • Patent number: 8153025
    Abstract: The invention relates to an improved red light emitting material of the formula M1?yA1+xSi4?xN7?x?2yOx+2y:RE whereby M is selected out of the group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected out of the group comprising Al, Ga, B or mixtures thereof, RE is selected out of the group comprising rare earth metals, Y, La, Sc or mixtures thereof and x is ?0 and ?1 and y is ?0 and ?0.2. This material is believed to crystallize in a novel structure type that comprises two individual lattice sites for rare 10 earth metal incorporation, which leads to an improved lighting behavior.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: April 10, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Peter J. Schmidt, Walter Mayr, Joerg Meyer, Wolfgang Schnick, Cora Sieglinde Hecht, Florian Stadler
  • Patent number: 8147716
    Abstract: A red phosphor includes yttrium (Y), gadolinium (Gd), an alkaline-earth metal element, and europium (Eu). A plasma display panel (PDP) includes the red phosphor.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: April 3, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Young-Ki Kim, Ick-Kyu Choi, Jay-Hyok Song, Yu-Mi Song, Young-Hun Lee, Min-kyu Kim, Soon-Rewl Lee, Yoon-Chang Kim, Dong-Sik Zang
  • Patent number: 8137586
    Abstract: A phosphor blend for a compact fluorescent lamp is described wherein the phosphor blend comprises a green-emitting Tb3+ phosphor, a Y2O3:Eu3+ phosphor, a Sr6BP5O20:Eu2+ phosphor, a Mg4GeO5.5F:Mn4+ phosphor, and optionally a BaMgAl11O17:Eu2+ phosphor, wherein the blend contains from 1% to 20% by weight of the Sr6BP5O20:Eu2+ phosphor and from 5% to 30% by weight of the Mg4GeO5.5F:Mn4+ phosphor. A compact fluorescent lamp having a phosphor coating containing the phosphor blend produces a light that is perceived as more pleasing than the light produced by standard compact fluorescent lamps.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: March 20, 2012
    Assignee: Osram Sylvania Inc.
    Inventors: Albert M. Cavallaro, Robert E. Levin, Chung-Nin Chau, Roger B. Hunt, Jr.
  • Patent number: 8089084
    Abstract: A light emitting device can be characterized as including a light emitting diode configured to emit light and a phosphor configured to change a wavelength of the light. The phosphor substantially covers at least a portion of the light emitting diode. The phosphor includes a compound having a host material. Divalent copper ions and oxygen are components of the host material.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: January 3, 2012
    Assignee: Seoul Semiconductor Co., Ltd.
    Inventors: Gundula Roth, Walter Tews, Chung Hoon Lee
  • Patent number: 8044572
    Abstract: A light conversion structure ensuring good light transmission and less deterioration and capable of controlling light to a desired color tone and emitting a highly bright light, and a light-emitting device using the same. The light conversion structure is a light conversion structure including a layer formed of a ceramic composite, which absorbs a part of a first light to emit a second light and transmits a part of the first light, and a fluorescent layer for the control of color tone, which is formed on the surface of the ceramic composite and which absorbs a part of the first light or a part of the second light to emit a third light and transmits a part of the first light or a part of the second light, wherein the ceramic composite includes a solidified body where at least two or more metal oxide phases are formed continuously and three-dimensionally entangled with each other, and at least one metal oxide phase in the solidified body includes a metal element oxide capable of emitting fluorescence.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: October 25, 2011
    Assignee: Ube Industries, Ltd.
    Inventors: Shin-ichi Sakata, Atsuyuki Mitani, Itsuhiro Fujii
  • Patent number: 8043528
    Abstract: A luminescent material is provided, which comprises a crystalline phase including Y, Si, O and N, and an activator comprising Tb and Ce.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: October 25, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Ryosuke Hiramatsu
  • Patent number: 8030834
    Abstract: Provided are a phosphor paste composition, a flat display device including the same, and a method of manufacturing the flat display device. The phosphor paste composition contains a phosphor with at least a heat-resistant material selected from a Group II atom-containing material, a Group III atom-containing material, and a Group IV atom-containing material, a binder, and an organic solvent. By using the phosphor paste composition, the deterioration of the phosphor can be prevented during a heat treating process. The flat display device includes a phosphor layer containing the phosphor coated with the heat-resistant material such that lifetime of the flat display device is increased and a permanent residual image phenomenon, the adsorption of water by the phosphor, and the like can be prevented.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: October 4, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Seung-Uk Kwon
  • Patent number: 8017038
    Abstract: A green phosphor, a plasma display panel (PDP) including the same, and a method for making the same. In one example, the green phosphor includes strontium (Sr); aluminum (Al); europium (Eu); and at least one element (M) selected from the group consisting of phosphorous (P), arsenic (As), antimony (Sb), and bismuth (Bi).
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: September 13, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Young-Hun Lee, Ick-Kyu Choi, Young-Ki Kim, Jay-Hyok Song, Yu-Mi Song, Young-Kwan Kim, Soon-Rewl Lee, Yoon-Chang Kim, Dong-Sik Zang
  • Patent number: 8012372
    Abstract: The invention provides borate phosphors composed of Ma(Mb)1-xBO3:(Mc)x, wherein Ma is Li, Na, K, Rb, Cs, or combinations thereof, Mb is Mg, Ca, Sr, Ba, Zn or combinations thereof, Mc is Y, La, Pr, Nd, Eu, Gd, Tb, Ce, Dy, Yb, Er, Sc, Mn, Zn, Cu, Ni, Lu, or combinations thereof, and 0?x?0.3. The borate phosphors emit visible light under the excitation of ultraviolet light or blue light, and may be further collocated with different colored phosphors to provide a white light illumination device.
    Type: Grant
    Filed: May 18, 2008
    Date of Patent: September 6, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Wei-Jen Liu, Yao-Tsung Yeh, Shyue-Ming Jang, Chien-Yueh Tung, Chih-Pin Wu, Teng-Ming Chen
  • Patent number: 8007684
    Abstract: The invention has for its object the provision of an oxynitride fluorescent material has higher emission luminance than conventional rare earth element-activated sialon fluorescent materials. To this end, an oxynitride fluorescent material is designed in such a way as comprising a JEM phase as a mother crystal and a luminescence center element M1. For instance, the luminescence center element M1 is at least one kind of an element selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. And the JEM phase is expressed as a general formula MA1(Si6-zAlz) N10-zOz (where M indicates a metal element, 0.1?z?3).
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: August 30, 2011
    Assignee: National Institute For Materials Science
    Inventor: Naoto Hirosaki
  • Patent number: 7851808
    Abstract: A nitride semiconductor light emitting diode (LED) comprises an n-type nitride semiconductor layer; an electron emitting layer formed on the n-type nitride semiconductor layer, the electron emitting layer being composed of a nitride semiconductor layer including a transition element of group III; an active layer formed on the electron emitting layer; and a p-type nitride semiconductor layer formed on the active layer.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: December 14, 2010
    Assignee: Samsung LED Co., Ltd.
    Inventors: Sang-Yeob Song, Ji Hye Shim, Bum Joon Kim
  • Patent number: 7846351
    Abstract: This invention provides a blue phosphor, which has higher blue brightness and larger half-value width in an emission spectrum as compared with the conventional rare earth-activated sialon phosphor and has better durability as compared with the conventional oxide phosphor. The phosphor comprises a metal element M, wherein M represents Ce, dissolved as a solid solute in a nitride or oxynitride crystal having a ?-type Si3N4 crystal structure, an AlN crystal structure, or an AlN polytype structure, and emits fluorescence having a peak in a wavelength region of 450 nm to 500 nm upon exposure to light from an excitation source.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: December 7, 2010
    Inventor: Naoto Hirosaki
  • Publication number: 20090267482
    Abstract: A blue phosphor, which has excellent durability and high brightness, and in particular a blue phosphor in a powder state, which can realize high-brightness luminescence upon exposure to an electron beam, are provided. The phosphor being characterized by comprising at least europium incorporated as a solid solution into an inorganic crystal having a crystal structure of an AlN crystal or an AlN solid solution crystal, wherein the phosphor emits divalent europium-derived fluorescence having a peak at a wavelength in the range of 430 nm to 500 nm upon exposure to an excitation source, is provided. In this case, it is more preferable that a predetermined metal element and silicon are incorporated therein. And a manufacturing method to manufacture such phosphor is also provided. Further, a lighting device comprising such blue phosphor is provided.
    Type: Application
    Filed: December 7, 2006
    Publication date: October 29, 2009
    Inventor: Naoto Hirosaki
  • Patent number: 7527748
    Abstract: To provide a phosphor for an electron beam excitation with a small deterioration in an emission efficiency and capable of maintaining a high luminance, even when an excitation density of an electron beam for a phosphor excitation is increased. As raw materials, Ca3N2(2N), AlN(3N), Si3N4(3N), and Eu2O3(3N) are prepared, and the raw materials thus prepared are measured and mixed, so that a molar ratio of each element becomes (Ca+Eu):Al:Si=1:1:1. Then, the mixture thus obtained is maintained and fired for at 1500° C. for 3 hours, and thereafter crushed, to manufacture the phosphor having a composition formula Ca0.985SiAlN3:Eu0.015.
    Type: Grant
    Filed: August 2, 2005
    Date of Patent: May 5, 2009
    Assignees: DOWA Electronics Materials Co., Ltd., Nichia Corporation
    Inventors: Masahiro Gotoh, Akira Nagatomi, Kenji Sakane, Shuji Yamashita
  • Patent number: 7429340
    Abstract: Provided are a phosphor paste composition, a flat display device including the same, and a method of manufacturing the flat display device. The phosphor paste composition contains a phosphor with at least a heat-resistant material selected from a Group II atom-containing material, a Group III atom-containing material, and a Group IV atom-containing material, a binder, and an organic solvent. By using the phosphor paste composition, the deterioration of the phosphor can be prevented during a heat treating process. The flat display device includes a phosphor layer containing the phosphor coated with the heat-resistant material such that lifetime of the flat display device is increased and a permanent residual image phenomenon, the adsorption of water by the phosphor, and the like can be prevented.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: September 30, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Seung-Uk Kwon
  • Patent number: 7361417
    Abstract: A phosphor layer having improved contrast and brightness characteristics and a display device including the same are provided. The phosphor layer is made out of an ultra-fine pigment, a dispersant, a phosphor, a photosensitizer and a binder. The phosphor has a uniform distribution along the thickness of the phosphor layer, and the pigment varies in content over the thickness of the phosphor layer. A method of forming the phosphor layer is based on existing phosphor layer processes and includes a reduced number of processing steps than a filter screen method, thereby markedly lowering the manufacturing costs. The phosphor layer can be used in a cathode ray tube, a plasma display panel, a field emission display, and an organic electroluminescent device.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: April 22, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Byung-Heun Kang, Jong-Sang Lee, Jae-Hong Lim, Seok-Hwan Cha, Hong-Kyu Choi
  • Patent number: 7334916
    Abstract: An electrical illumination device for generating saturated colors with at least two illumination units. The illumination units each have a discharge vessel with a low-pressure discharge and a phosphor coating on the inner wall of the vessel, characterized in that at least one illumination unit has a discharge vessel with a xenon fill and a dielectric barrier discharge.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: February 26, 2008
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrisćche Gluehlampen mbH
    Inventors: Gerhard Doll, Martin Zachau
  • Patent number: 7270773
    Abstract: A quantum-splitting fluoride-based phosphor comprises gadolinium, at least a first alkali metal, and a rare-earth metal activator. The phosphor is made in a solid-state method without using HF gas. The phosphor can be used alone or in conjunction with other phosphors in light sources and displays wherein it can be excited by VUV radiation, and increases the efficiency of these devices.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: September 18, 2007
    Assignee: General Electric Company
    Inventors: Venkatesan Manivannan, Alok Mani Srivastava, Holly Ann Comanzo
  • Patent number: 7208103
    Abstract: A quantum-splitting phosphor has a formula of ADF5:Pr3+, wherein A is at least one alkaline-earth metal and D is at least one Group-IIIB metal. The phosphor is made in a solid-state method without using hazardous HF gas. The phosphor can be used alone or in conjunction with other phosphors in light sources and displays wherein it can be excited by VUV radiation, and increase the efficiency of these devices.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: April 24, 2007
    Assignee: General Electric Company
    Inventors: Venkatesan Manivannan, Alok Mani Srivastava, Holly Ann Comanzo
  • Patent number: 7202594
    Abstract: A display device which includes, a display panel, a red emitting fluorescent film, a green emitting fluorescent film, and a blue emitting fluorescent film, each of the fluorescent films being formed on an inner surface of the display panel. The red emitting fluorescent film contains red fluorescent particles having an average particle diameter ranging from 6 to 12 ?m and covered with red pigment having an average particle diameter ranging from 1/100 to 1/10 of the average particle diameter of the red fluorescent particles, the red emitting fluorescent particles are formed of Y2O2S:Eu, a concentration of Eu in the red emitting fluorescent film is 60 ppm or less, and the x-value of luminescent chromaticity of the red emitting fluorescent film is not less than 0.620.
    Type: Grant
    Filed: June 23, 2005
    Date of Patent: April 10, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hisashi Chigusa, Keisuke Iida, Hidemi Matsuda
  • Patent number: 7176612
    Abstract: An LED device at least including a blue light emitting element having peak emission wavelength of 420 nm to 480 nm, a green fluorescent substance having peak wavelength of fluorescent spectrum in the range of 500 nm to 580 nm with the emission of the blue light emitting element, and a red light emitting element having peak emission wavelength of 600 nm to 670 nm is provided. The device may further include an ultraviolet/violet light emitting element for exciting green fluorescent substance. As a result, an LED device capable of attaining bright white light with good color reproduction characteristic is provided.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: February 13, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masatoshi Omoto, Masatsugu Masuda, Masaharu Kitano
  • Patent number: 7161287
    Abstract: The present invention provides a green emitting yttrium silicate phosphor, which has an improved temperature characteristic and life, and a cathode-ray tube using it. A green emitting yttrium silicate phosphor according to the present invention comprises a composition having the general composition (Y, Sc, Tb)2SiO5, wherein the mole ratio of Sc to the entire rare-earth element in the phosphor is 0.045<Sc/(Y+Sc+Tb)<0.17. Adding the above concentration range of Sc improves its temperature characteristic and life. It is more preferable that the concentration range is 0.07<Sc/(Y+Sc+Tb)<0.13.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: January 9, 2007
    Assignees: Nichia Corporation, Matsushita Toshiba Picture Display Co., Ltd.
    Inventors: Yasunobu Noguchi, Seiji Niki, Kanji Tanaka, Shunji Fukushima
  • Patent number: 7153451
    Abstract: Phosphors having high luminescence characteristics are provided while achieving manufacturing cost reductions by minimizing the usage amount of Eu, the luminescence center. Also provided are a display device (PDP, etc) and a fluorescent lamp having excellent display and/or luminescence characteristics as a result of using the phosphors, while achieving manufacturing cost reductions by minimizing the Eu usage amount.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: December 26, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiro Zukawa, Masatoshi Kitagawa, Masaharu Terauchi, Junko Asayama, Masahiro Sakai
  • Patent number: 7138756
    Abstract: A phosphor, which has less reduction in emission efficiency and is capable of keeping high luminance even when density of an electron beam for exciting the phosphor increases, is provided. As raw materials, Ca3N2 (2N), AlN (3N), Si3N4 (3N), and Eu2O3 (3N) are prepared, and each of the raw materials is weighed so that a mole ratio of each element is, for example, (Ca+Eu):Al:Si=1:1:1, and mixed, then the mixture is held and fired at 1500° C. under the inert atmosphere for three hours, and thereafter ground to produce a phosphor having a composition formula of Ca0.985SiAlN3:Eu0.
    Type: Grant
    Filed: September 27, 2004
    Date of Patent: November 21, 2006
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Masahiro Gotoh, Akira Nagatomi, Kenji Sakane, Shuji Yamashita
  • Patent number: 7122128
    Abstract: A phosphor comprises a borate of terbium, at least an alkaline-earth metal, and at least a Group-3 metal. In one embodiment, the phosphor has a formula of A3(D1-xTbx)3(BO3)5; wherein A is at least an alkaline-earth metal selected from the group consisting of calcium, barium, strontium, and magnesium; D is at least a Group-3 metal selected from the group consisting of lanthanum, scandium, and yttrium; and 0<x<0.5. The phosphor can be used in light sources such as those based on mercury discharge or light-emitting diodes and in displays.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: October 17, 2006
    Assignee: General Electric Company
    Inventors: Holly Ann Comanzo, Venkatesan Manivannan, Alok Mani Srivastava, William Winder Beers
  • Patent number: 7056451
    Abstract: A phosphor comprises a material having a formula of AB3O6:Ce,Mn, wherein A is at least a rare-earth metal other than cerium. The phosphor can be used in light sources and displays.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: June 6, 2006
    Assignee: General Electric Company
    Inventors: Venkatesan Manivannan, Alok Mani Srivastava, Holly Ann Comanzo
  • Patent number: 7053551
    Abstract: At least one kind of a rear earth element or an alkaline earth metal element is activated together with manganese in a zinc silicate system phosphor, and a mean particle size of the phosphor is between 0.01 and 1.0 ?m.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: May 30, 2006
    Assignee: Konica Corporation
    Inventors: Hideki Hoshino, Satoshi Ito, Naoko Furusawa, Hisatake Okada
  • Patent number: 7019452
    Abstract: A boron-containing phosphor comprises a material having a formula of AD1?xEuxB9O16, wherein A is an element selected from the group consisting of Ba, Sr, Ca, Mg, and combinations thereof; D is at least an element selected from the group consisting of rare-earth metals other than europium; and x is in the range from about 0.005 to about 0.5. The phosphor is used in a blend with other phosphors in a light source for generating visible light with a high color rendering index.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: March 28, 2006
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Venkatesan Manivannan
  • Patent number: 6960310
    Abstract: A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I): M11?a?b?c?dM2aM3bM41?eM511?fM6c?d+e+fO19?(b+c+f)/2??(I) (wherein M1 is at least one element selected from the group consisting of La, Y and Gd, M2 is at least one element selected from the group consisting of Ce and Tb, M3 is at least one element selected from the group consisting of Ca, Sr and Ba, M4 is at least one element selected from the group consisting of Mg and Zn, M5 is at least one element selected from the group consisting of Al and Ga, and M6 is at least one element selected from the group consisting of Mn and Eu, and a, b, c, d, e and f are numbers satisfying the conditions of 0?a<1, 0?b?0.6, 0?c?0.5, 0?d?0.5, 0?e<1, 0?f<1, a+b+c+d<1 and 0<c+d+e+f), respectively.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: November 1, 2005
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuichiro Imanari, Takayoshi Ezuhara, Susumu Miyazaki
  • Patent number: 6919676
    Abstract: Disclosed is a new and useful discharge lamp for use in applications, such as tanning and technical lighting, and a method of making the same. The discharge lamp includes, inter alia, a vitreous tube having an axial length, a base phosphor coating applied on the interior of the tube along the entire axial length, and at least one phosphor over-coat applied over the base phosphor coating in one or more axial regions of the vitreous tube. The phosphor over-coat is applied to less than the total length of the vitreous tube. In a representative embodiment, the vitreous tube has an outer periphery which is smooth, but in alternate embodiments, a helical groove path is formed therein over at least a portion of the axial length.
    Type: Grant
    Filed: June 16, 2003
    Date of Patent: July 19, 2005
    Assignee: Voltarc Technologies Inc.
    Inventors: Joseph D. Laudano, Prasad S. Sastry, Kamlesh C. Kansal
  • Patent number: 6888173
    Abstract: An LED is mounted on a substrate, and a protector made of a transparent material is provided for sealing the LED. A color correcting filter is formed on the protector. The color correcting filter has an effect of changing chromaticity of emitted light of the LED to desired chromaticity of illuminating light to be discharged from the LED device.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: May 3, 2005
    Assignee: Citizen Electronics Co, Ltd.
    Inventors: Hirohiko Ishii, Koichi Fukasawa
  • Patent number: 6875372
    Abstract: Cathodoluminescent 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 cathodoluminescent display devices, incorporating the phosphor powders.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: April 5, 2005
    Assignee: Cabot Corporation
    Inventors: Mark J. Hampden-Smith, Toivo T. Kodas, James Caruso, Quint H. Powell, Klaus Kunze, Daniel J. Skamser
  • Patent number: 6828718
    Abstract: A phosphor compliant with formula (1) below and a perovskite structure containing samarium (Sm): MTiO3: (A, B)  (1) where M is an alkali earth metal, A is an element selected from the group consisting of cerium (Ce), praseodymium (Pr), europium (Eu), terbium (Tb), and thulium (Tm), and B is a Group IIIA element of the periodic table. The phosphor has excellent luminance and lifespan while not containing S in its host matrix, and is also environmentally safe since it does not contain cadmium that is harmful to the environment. Therefore, the phosphor can be advantageously utilized for various display applications including vacuum fluorescent displays (VFDs) and field emission displays (FEDs).
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: December 7, 2004
    Assignee: Samsung SDI Co., Ltd
    Inventors: Young-chul You, Kyu-chan Park, Sang-hyuk Lee, Il Yu
  • Patent number: 6808829
    Abstract: An image-display device using phosphor can improve the its luminescence efficiency and characteristics of color coordinates by adding an IIA element to a host crystal of ZnS phosphor to form a composite crystal. The image-display device improves the luminescence efficiency and color coordinate characteristics by using a phosphor expressed by Zn(1−x)MIIAxS:MIB, MIII where MIIA is one or more IIA elements in periodic table of elements, MIB is one or more IB elements and MIII is one or more MIIIA elements such as Sc or Y.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: October 26, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Masaaki Komatsu, Masatoshi Shiiiki, Shin Imamura
  • Patent number: 6753099
    Abstract: 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. The composition of the above phosphor is represented by chemical formula: {(Y1−y−zMyGdz)1−xTbx}2(Si1−bGebO2)1+aO3 where values of x, y, z, a, and b are assigned, subject to 0<x≦1, 0≦y≦1, 0≦z≦1, 0<a≦1, and 0≦b≦1, and M is at least one element selected from a group comprising Sc, In, La, Lu, Yb, Ce, Eu, Sm, Tm, Ho, Er, and Nd. By using this phosphor, phosphors that emit light of higher luminance with less luminance degradation and are suitable for high-quality image display and imaging devices producing high-quality images are obtained.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: June 22, 2004
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd., Kasei Optonix, Ltd.
    Inventors: Shin Imamura, Masatoshi Shiiki, Masaaki Komatsu, Hidetsugu Matsukiyo, Yoshihiro Koseki, Takashi Hase, Tsutomu Yamada
  • Patent number: 6736995
    Abstract: This invention relates to a plasma picture screen provided with a phosphor layer 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: Grant
    Filed: January 29, 2002
    Date of Patent: May 18, 2004
    Assignee: Koninklijke Philips Electronics N.V
    Inventors: Thomas Juestel, Hans-Helmut Bechtel, Walter Mayr
  • Patent number: 6696782
    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.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: February 24, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Shin Imamura, Masatoshi Shiiki, Hiromichi Yamada, Masaaki Komatsu
  • Publication number: 20040016908
    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 garnets, thiogallates, aluminates, or orthosilicates doped with rare earths, and preferably Ce-doped phosphors. The luminous substance pigments have particle sizes≦20 &mgr;m and a mean grain diameter d50<5 &mgr;m.
    Type: Application
    Filed: July 21, 2003
    Publication date: January 29, 2004
    Inventors: Klaus Hohn, Alexandra Debray, Peter Schlotter, Ralf Schmidt, Jurgen Schneider
  • Patent number: 6613247
    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 garnets, thiogallates, aluminates, or orthosilicates doped with rare earths, and preferably Ce-doped phosphors. The luminous substance pigments have particle sizes ≦20 &mgr;m and a mean grain diameter d50≦5 &mgr;M.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: September 2, 2003
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Klaus Höhn, Alexandra Debray, Peter Schlotter, Ralf Schmidt, Jürgen Schneider
  • Patent number: 6592780
    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.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: July 15, 2003
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Klaus Höhn, Alexandra Debray, Peter Schlotter, Ralf Schmidt, Jürgen Schneider
  • Patent number: 6590333
    Abstract: 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: Grant
    Filed: September 29, 2000
    Date of Patent: July 8, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Teruki Suzuki, Masatoshi Shiiki, Choichiro Okazaki, Tadashi Furukawa
  • Patent number: 6552487
    Abstract: 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: Grant
    Filed: October 23, 2000
    Date of Patent: April 22, 2003
    Assignee: Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
    Inventors: Andries Ellens, Franz Zwaschka
  • Patent number: 6531814
    Abstract: 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: Grant
    Filed: February 17, 2000
    Date of Patent: March 11, 2003
    Assignee: General Electric Company
    Inventor: Jon B. Jansma
  • Patent number: 6509685
    Abstract: 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: Grant
    Filed: October 27, 2000
    Date of Patent: January 21, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Thomas Jüstel, Hans Nikol, Helmut Bechtel, Cornelis Reinder Ronda
  • Patent number: 6501102
    Abstract: Presented is an LED device that produces white light by performing phosphor conversion on substantially all of the primary light emitted by the light emitting structure of the LED device. The LED device comprises a light emitting structure and at least one phosphor-converting element located to receive and absorb substantially all of the primary light. The phosphor-converting element emits secondary light at second and third wavelengths that combine to produce white light. Some embodiments include an additional phosphor-converting element, which receives light from a phosphor-converting element and emits light at a fourth wavelength. In the embodiments including an additional phosphor-converting element, the second, third, and fourth wavelengths combine to produce white light. Each phosphor-converting element includes at least one host material doped with at least one dopant. The phosphor-converting element may be a phosphor thin film, a substrate for the light emitting structure, or a phosphor powder layer.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: December 31, 2002
    Assignee: LumiLeds Lighting, U.S., LLC
    Inventors: Regina B. Mueller-Mach, Gerd O. Mueller, George M. Craford
  • Patent number: RE44162
    Abstract: To provide a phosphor for an electron beam excitation with a small deterioration in an emission efficiency and capable of maintaining a high luminance, even when an excitation density of an electron beam for a phosphor excitation is increased. As raw materials, Ca3N2(2N), AlN(3N), Si3N4(3N), and Eu2O3(3N) are prepared, and the raw materials thus prepared are measured and mixed, so that a molar ratio of each element becomes (Ca+Eu):Al:Si=1:1:1. Then, the mixture thus obtained is maintained and fired for at 1500° C. for 3 hours, and thereafter crushed, to manufacture the phosphor having a composition formula Ca0.985SiAlN3:Eu0.015.
    Type: Grant
    Filed: May 4, 2011
    Date of Patent: April 23, 2013
    Assignees: Dowa Electronics Materials Co., Ltd., Nichia Corporation
    Inventors: Masahiro Gotoh, Akira Nagatomi, Kenji Sakane, Shuji Yamashita