Group Iv Element Containing Patents (Class 252/301.4F)
  • Patent number: 9034205
    Abstract: The formula of a luminescent material is NaY1-xLnxGeO4, wherein Ln is lanthanon, and the value of x is 0<x?0.2. The luminescent material adulterated with lanthanon constitutes germanate luminescent material comprising lanthanon, which improves efficiently the stability and luminescent performance of the luminescent material. The presence of lanthanon enables the luminescent material to emit light with different colors such as red, green, blue, etc. under the excitation of cathode rays, and be better used in a filed emission device. In the preparation method of the luminescent material, source components are mixed up and directly and sintered, and the luminescent material is acquired.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: May 19, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Chaopu Shi, Wenbo Ma
  • Patent number: 9034207
    Abstract: A phosphor is represented by a general Formula: EuxMyL3?x?ySi6?zAlzN11?(z+y+z)O(z+y+z) and satisfies 0.00001?x?2.9999, 0.0001?y?2.99999 and 0?z?6.0. L is at least one element selected from La, Y, Gd and Lu. M is at least one element selected from Ca, Sr, Ba and Mn.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: May 19, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyong Sik Won, Chan Suk Min, Seong Min Kim, Sung Hak Jo, Youn Gon Park, Chul Soo Yoon
  • Publication number: 20150129802
    Abstract: Disclosed is a metal nanoparticle-coating silicate luminescent material, which has a molecular formula of Li2Ca1-xSiO4:Tbx@My; where @ represents a coating, M is at least one among Ag, Au, Pt, Pd, and Cu nanoparticles, where 0<x?0.2, where y is the molar ratio between M and Si, and where 0<y?1×10?2. The composition of the metal nanoparticle-coating silicate luminescent material is metal nanoparticles coated with Li2Ca1-xSiO4:Tbx, all of which are substances having great chemical stability and having great stability when bombarded by large electron beams. Also provided in the present invention is a method for preparing the metal nanoparticle coating silicate luminescent material.
    Type: Application
    Filed: May 8, 2012
    Publication date: May 14, 2015
    Applicant: SHENZHEN OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY CO., LTD.
    Inventors: Mingjie Zhou, Rong Wang, Guitang Chen
  • Publication number: 20150129803
    Abstract: The present invention provides a stannate fluorescent material having a formula: A2-xSnO4:Eux@SnO2@My; wherein A is selected from the group consisting of Ca, Sr, and Ba; M is at least one metal nanoparticles selected from the group consisting of Ag, Au, Pt, Pd, and Cu; 0<x?0.05; y is a mole ratio of M to Sn, and 0<y?1×10?2; @represents coating, in the stannate fluorescent material, M serves as a core, SnO2 serves as an intermediate layer shell, and A2-xSnO4:Eux serves as an outer layer shell. In the stannate fluorescent material, a core-shell structure is formed by coating at least one metal nanoparticles selected from the group consisting of Ag, Au, Pt, Pd, and Cu, since metal nanoparticles can improve the internal quantum efficiency of the fluorescent material, the stannate fluorescent material exhibits a higher luminous intensity.
    Type: Application
    Filed: July 31, 2012
    Publication date: May 14, 2015
    Applicants: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY CO.,LTD., SHENZHEN OCEAN'S KING LIGHTING ENGINEERING CO., LTD.
    Inventors: Mingjie Zhou, Rong Wang, Guitang Chen
  • Patent number: 9028718
    Abstract: To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x1(17.5) and the color coordinate y1(17.5) of the light emitted at a driving current density of 17.5 A/cm2 and the color coordinate x1(70) and the color coordinate y1(70) of the light emitted at a driving current density of 70 A/cm2 satisfy the following Expressions (D) and (E): ?0.006?x1(17.5)?x1(70)?0.006??(D), ?0.006?y1(17.5)?y1(70)?0.006??(E).
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: May 12, 2015
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Naoto Kijima, Yasuo Shimomura, Hideaki Kaneda, Kimiya Takeshita
  • Patent number: 9028716
    Abstract: The invention relates to compounds of the formula (I) Ma2-y (Ca,Sr,Ba)1-x-ySi5-zMezN8:Eux Cey (I), where Ma=Li, Na and/or K Me=Hf4+ and/or Zr4+ x=0.0015 to 0.20 and y=0 to 0.15 z<4, and to a process for the preparation of these compounds and to the use as phosphors and conversion phosphors for conversion of the blue or near-UV emission from an LED.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: May 12, 2015
    Assignee: Merck Patent GmbH
    Inventors: Holger Winkler, Ralf Petry, Tim Vosgroene, Thomas Juestel, Dominik Uhlich, Danuta Dutczak
  • Patent number: 9028719
    Abstract: An object of the present invention is to provide a phosphor that is combined with a blue LED to achieve white light at a low color temperature as if singly, has a broad fluorescence spectrum for excellent color rendering properties, has a high luminous efficiency, is thermally and chemically stable like conventional nitride-based phosphors, and has a small decrease in luminance at high temperatures. Another object of the present invention is to provide a light emitting device using such a phosphor. The present invention relates to a ?-sialon that is expressed by the general formula, Si6-zAlzOzN8-z:Eu (0<z<4.2). In the ?-sialon, P2/P1 is not lower than 0.5 and not higher than 1000 (P1 representing the height of an absorption line appearing in the region where g is 2.00±0.02 in a first derivative spectrum obtained by an electron spin resonance technique at 25° C., P2 representing the difference between the maximum value and the minimum value in a spectrum on the lower magnetic field side of P1).
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: May 12, 2015
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideyuki Emoto, Toshiaki Nagumo
  • Publication number: 20150123034
    Abstract: The method described herein allows for melt stabilization and vapor-phase synthesis of a cesium germanium halide utilizing germanium dihalides formed in situ. This disclosure allows for the melting of cesium germanium halides without decomposition, which allows for growing crystals of these materials from the melt. This disclosure allows for a direct synthesis of these materials without the use of water or the introduction of other possible contaminants.
    Type: Application
    Filed: December 19, 2014
    Publication date: May 7, 2015
    Inventors: Steven R. Bowman, Nicholas J. Condon, Shawn P. O'Connor
  • Publication number: 20150123033
    Abstract: Embodiments of the present invention are directed a ?-SiAlON:Eu2+ based green emitting phosphor having the formula Eux(A1)6?z(A2)zOyN8?z(A3)2(x+z?y), where 0<z?4.2; 0?y?z; 0<x?0.1; A1 is Si, C, Ge, and/or Sn; A2 is Al, B, Ga, and/or In; A3 is F, Cl, Br, and/or I. The new set of compounds described by Eux(A1)6?z(A2)zOyN8?z(A3)2(x+z?y) have the same structure as ?-Si3N4. Both elements A1 and A2 reside on Si sites, and both O and N occupy the nitrogen sites of the ?-Si3N4 crystal structure. A molar quantity (z?y) of the A3? anion (defined as a halogen) reside on nitrogen sites.
    Type: Application
    Filed: October 7, 2014
    Publication date: May 7, 2015
    Inventors: Yi-Qun Li, Dejie Tao
  • Patent number: 9023241
    Abstract: Provided is a silicon nitride powder for siliconitride phosphor having high luminance, a Sr3Al3Si13O2N21 phosphor and a ?-Sialon phosphor using the powder, which can be used for vacuum fluorescent displays (VFDs), field emission displays (FEDs), plasma display panels (PDPs), cathode ray tubes (CRTs), light emitting diodes (LEDs), or the like, and processes for producing these phosphors. The silicon nitride powder for the siliconitride phosphors is a crystalline silicon nitride powder for use as a raw material for producing siliconitride phosphors including a silicon element, a nitrogen element, and an oxygen element, and has an average particle diameter of 1.0 to 12 ?m and an oxygen content of 0.2 to 0.9% by weight.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: May 5, 2015
    Assignee: Ube Industries, Ltd
    Inventors: Masataka Fujinaga, Takuma Sakai, Shinsuke Jida
  • Patent number: 9023240
    Abstract: Provided are a crystalline silicon nitride powder for a siliconitride phosphors, which is used as a starting material for producing a siliconitride phosphor containing a silicon element and a nitrogen element but no oxygen element as a constitutent element, an oxygen content of the silicon nitride phosphor being 0.2-0.8 wt %; a CaAlSiN3 phosphor, an Sr2Si5N8 phosphor, an (Sr, Ca)AlSiN3 phosphor and an La3Si6N11 phosphor, each using the silicon nitride powder; and a method for producing the phosphors.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: May 5, 2015
    Assignee: UBE Industries, Ltd.
    Inventors: Masataka Fujinaga, Takayuki Ueda, Takuma Sakai, Shinsuke Jida
  • Publication number: 20150115201
    Abstract: Provided in the present invention is a metal nanoparticle-coating titanate fluorescent material, which has a molecular formula of A1-x-yByTiO3:xR@SiO2@Mz, where A is one or two elements selected from Ca, Sr, Ba and Mg, where B is one element selected from Li, Na and K, where R is one or two elements selected from Eu, Gd, Tb, Tm, Sm, Ce, Dy and Mn, where M is one selected from Ag, Au, Pt, Pd and Cu nanoparticles, where 0<x?0.40; 0?y?0.40, where z is the molar ratio of M and SiO2, where 0<z?1×10?2, where @ represents a coating, where M is a core where SiO2 is an intermediate layer shell, and where A1-x-yByTiO3:xR is an outer layer shell. The metal nanoparticle-coating titanate fluorescent material forms a core-shell structure by introducing metal nanoparticles, while the metal nanoparticles generate a Plasmon resonance effect, thus increasing the internal quantum efficiency of the metal nanoparticle-coating titanate fluorescent material, which is provided with increased luminescent intensity.
    Type: Application
    Filed: May 8, 2012
    Publication date: April 30, 2015
    Applicant: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY CO., LTD.
    Inventors: Mingjie Zhou, Rong Wang, Guitang Chen
  • Patent number: 9017574
    Abstract: A red phosphor is provided. Also provided is a lighting apparatus containing a red phosphor.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: April 28, 2015
    Assignee: Lightscape Materials, Inc.
    Inventors: Yuanqiang Li, Michael Dennis Romanelli, Yongchi Tian
  • Patent number: 9011721
    Abstract: Halo-silicate luminescent materials and preparation methods thereof are provided. The said luminescent materials are represented by the following general formula: (Ba1-yAy)2-xSiO4:Eux, Dz@ Mn, wherein A is selected from one or two of Sr, Ca, Mg or Zn, D is selected from one of F or Cl, M is selected from at least one of Ag, Au, Pt, Pd or Cu metal nano-particles; @ is coating; (Ba1-yAy)2-xSiO4:Eux, Dz, is shell; 0.001<x?0.15, 0?y?0.5, 0?z?0.5, 0<n?1×10?2. The said luminescent materials have excellent chemical stability and high luminous intensity. Furthermore, the luminescent materials have controlled spherical shape which is beneficial to the coating screen process and the improved displaying effect. The said preparation methods have simple technique, no pollution, manageable process conditions and low equipment requirement, and are beneficial to industry production.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: April 21, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Rong Wang, Wenbo Ma
  • Patent number: 9011718
    Abstract: The emission strength of a light released from a blue light-emitting phosphor having a merwinite crystal structure and an elemental formula of (Sr,Ca)3MgSi2O8 activated with Eu in which a molar ratio of Sr and Ca is in the range of 1:0.10 to 1:0.30 is stable in a wide temperature range.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: April 21, 2015
    Assignee: Ube Material Industries, Ltd.
    Inventors: Kouichi Fukuda, Jin Amagai, Seiji Noguchi, Toru Inagaki, Masaki Tanaka
  • Publication number: 20150102260
    Abstract: A titanate luminescent material has a formula of A1-x,TiO3:Prx@TiO2@My; wherein A is at least one selected from the group consisting of Ca, Sr, and Ba; M is at least one nanoparticles selected from the group consisting of Ag, Au, Pt, Pd, and Cu; 0<x?0.01; y is the molar ratio between M and Ti in A1-x,TiO3:Prx@TiO2, and 0<y?1×10?2; @ represents coating; M is a core, TiO2 is an intermediate layer shell, and A1-xTiO3:Prx is an outer layer shell. The titanate luminescent material has a high stability and a better luminescent performance. A preparation method of the titanate luminescent material is also provided.
    Type: Application
    Filed: May 8, 2012
    Publication date: April 16, 2015
    Inventors: Mingjie Zhou, Rong Wang, Guitang Chen
  • Publication number: 20150102261
    Abstract: A phosphor mixture comprising at least two phosphors A, B which give an emission spectrum having the maximum emission peak in the visible region, in which a wavelength of the maximum emission peak of the phosphor A differs from that of the maximum emission peak of the phosphor B by not more than 50 nm, and in which the maximum emission peak of the phosphor A has an emission intensity less than that of the phosphor B and the maximum emission peak of the phosphor A shows a half-width more than a half-width of that of the phosphor B gives an light emission having the maximum emission peak whose emission intensity is higher than that of the phosphor A and whose half-width is broader than that of the phosphor B.
    Type: Application
    Filed: May 22, 2013
    Publication date: April 16, 2015
    Inventors: Kouichi Fukuda, Jin Amagai, Toru Inagaki, Rika Nogita, Kenji Arima
  • Patent number: 8992797
    Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: (1/7)?(3?x?y?z+w2)/6<(1/2), 0<(1.5x+y?w2)/6<(9/2), 0<x<3, 0?y<2, 0<z<1, 0?w1?5, 0?w2?5, and 0?w1+w2?5).
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takatoshi Seto, Naoto Kijima
  • Publication number: 20150083965
    Abstract: A core-shell structured silicate luminescent material and a preparation method thereof. The molecular formula of the luminescent material is: MLn1-xSiO4:xRE@SiO2; where @ represents a coating, where M is one or two elements among Li, Na, and K, where Ln is one or two elements among Y, Sc, Lu and La, where the value of x is 0<x?0.6; and where RE is one, two, or three elements among Tb, Gd, Sm, Eu, Dy, Ce and Tm. The compositions of the luminescent material are all chemicals of increased chemical stability, and, when subjected to electron beam bombardment for an extended period, provide a stable matrix and do not decompose easily.
    Type: Application
    Filed: May 8, 2012
    Publication date: March 26, 2015
    Applicants: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY CO., LTD., SHENZHEN OCEAN'S KING LIGHTING ENGINEERING CO., LTD.
    Inventors: Mingjie Zhou, Rong Wang, Guitang Chen
  • Publication number: 20150083966
    Abstract: A fluorophor includes: ?-type sialon crystal which is expressed by a general formula: (Lix1, Eux2) (Si12?(m+n)Alm+n)(OnN16?n), wherein x1 is an amount of solid solution of Li in a sialon unit cell, and x2 is an amount of solid solution of Eu in the sialon unit cell, wherein the parameters x1, x2, m, and n satisfy: 1.6?x1?2.4 (1), 0.001?x2?0.4 (2), 1.8?m?2.4 (3), 0.8?n?1.2 (4), wherein the ?-type sialon crystal emits fluorescence with a peak in a wavelength region of from 550 nm to 575 nm upon irradiation of an excitation source.
    Type: Application
    Filed: October 6, 2014
    Publication date: March 26, 2015
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Naoto HIROSAKI, Rong-Jun XIE, Mamoru MITOMO
  • Patent number: 8986574
    Abstract: There are provided an oxynitride-based phosphor and a light emitting device including the same, the oxynitride-based phosphor containing at least calcium (Ca), barium (Ba), silicon (Si), oxygen (O), and nitrogen (N) as host material components in a host material and having a rare-earth element dissolved in the host material as an activator, wherein the rare-earth element is at least one from a group consisting of manganese (Mn), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), dysprosium (Dy), terbium (Tb), holmium (Ho), erbium (Er), thulium (Tm), and ytterbium (Yb), and the host material has a monoclinic crystal structure in which a crystal lattice according to a peak of an X-ray powder diffraction pattern has values of a=7.076, b=23.888, c=4.827, ?=?=90°, and ?=109.110°.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: March 24, 2015
    Assignees: Samsung Electronics Co., Ltd., Industry-Academy Cooperation Foundation of Suncheon National University
    Inventors: Hyong Sik Won, Kee Sun Sohn, Woon Bae Park
  • Publication number: 20150076406
    Abstract: Some phosphor powders can be difficult to form into ceramic compacts because they are difficult to sinter. As described herein, phosphor powders that can degrade under conventional sintering temperatures can be sintered by heating the powder at a lower temperature, such as less than 800° C., while the powder is under greater than atmospheric pressure, such as at least 0.05 GPa. Phosphor ceramic compacts prepared by this method, and light-emitting devices incorporating these phosphor ceramic compacts, are also described.
    Type: Application
    Filed: March 12, 2013
    Publication date: March 19, 2015
    Inventors: Jiadong Zhou, Guang Pan, Hironaka Fujii, Bin Zhang
  • Patent number: 8980131
    Abstract: Silicate luminescent material and preparation method thereof are provided. The structural formula of the silicate luminescent material is Zn2-y(Si1-xMx)O4:Mny, wherein M is metal element and its oxide is conductive, x is in a range of 0.001 to 0.15, and y is in a range of 0.001 to 0.05. For integrated with conductive metal oxide component, the silicate luminescent material could take advantage of its conductive properties, and the silicate luminescent material could improve the luminescence properties under cathode ray significantly comparing with that of the luminescent material has not been integrated with conductive component. Accordingly, the luminescence efficiency of the above silicate luminescent material is increased.
    Type: Grant
    Filed: November 28, 2009
    Date of Patent: March 17, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Chaopu Shi, Rong Wang, Wenbo Ma
  • Publication number: 20150069298
    Abstract: The scintillator single crystal of the invention comprises a cerium-activated orthosilicate compound represented by the following formula (1). Gd2?(a+x+y+z)LnaLuxCeyLmzSiO5??(1) (In formula (1), Lm represents at least one element selected from among Pr, Tb and Tm, Ln represents at least one element selected from among lanthanoid elements excluding Pr, Tb and Tm, and Sc, and Y, a represents a value of at least 0 and less than 1, x represents a value of greater than 1 and less than 2, y represents a value of greater than 0 and no greater than 0.01, and z represents a value of greater than 0 and no greater than 0.01. The value of a+x+y+z is no greater than 2.
    Type: Application
    Filed: November 17, 2014
    Publication date: March 12, 2015
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Yasushi Kurata, Tatsuya Usui, Naoaki Shimura
  • Patent number: 8974698
    Abstract: A method for producing an ?-sialon-based oxynitride phosphor includes a mixed powder blended such that the product is represented by the formula: MxSi12?(m+n)Al(m+n)OnN16?n:Lny (wherein M is at least one metal selected from Li, Ca, Mg, Y and a lanthanide metal excluding La and Ce, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb and Yb), the mixed powder containing an amorphous silicon nitride powder having an loose bulk density of 0.16 to 0.22 g/cm3, and is fired at 1,400 to 2,000° C. in a nitrogen-containing inert gas atmosphere.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: March 10, 2015
    Assignee: Ube Industries, Ltd.
    Inventors: Masataka Fujinaga, Takayuki Ueda, Shinsuke Jida
  • Patent number: 8974697
    Abstract: According to one embodiment, the luminescent material shows a luminescence peak in a wavelength range of 570 to 670 nm when excited with light having an emission peak in a wavelength range of 250 to 520 nm. The luminescent material includes a host material having a crystal structure substantially same as the crystal structure of Sr2Si7Al3ON13. The host material is activated by Eu, and includes Sr and Ca to satisfy a relationship of 0.008?MCa/(MSr+MCa)?0.114, where MCa is a number of moles of Ca and MSr is a number of moles of Sr.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: March 10, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Keiko Albessard, Masahiro Kato, Yumi Fukuda, Iwao Mitsuishi, Takahiro Sato, Shigeya Kimura, Aoi Okada, Naotoshi Matsuda, Ryosuke Hiramatsu, Yasushi Hattori, Kunio Ishida, Hironori Asai
  • Patent number: 8961826
    Abstract: A luminescent material and a preparation method thereof are provided. The said luminescent material is represented by the following chemical formula: Ln2-xEuxSn2O7, wherein Ln is selected from one of Gd, Y and La, 0.1?x?1.5. The said luminescent material has good electrical performance, anti-electron bombardment and stable luminescent property. It is appropriate to be used in field emission light-emitting devices. The said preparation method has simple technique, no pollution, manageable process conditions, low preparation temperature and low equipment requirement, and is beneficial to industry production.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: February 24, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Xiaofang Liang, Wenbo Ma
  • Patent number: 8961827
    Abstract: The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction. The red fluorescent material contains an element (A), europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of the following in compositional formula (1). [A(m-x)Eux][Si(9-y)Cy]OnN[12-2(n-m)/3] Note that, in the compositional formula (1), element A is group 2 element including at least calcium (Ca) and strontium (Sr). Also, note that, in the composition formula (1), m, x, y, and n satisfy 3<m<5, 0<x<1, 0<y<9, and 0<n<10, respectively. Such red fluorescent material is able to improve quantum efficiency, compared with a red fluorescent material which does not contain calcium (Ca) but contains strontium (Sr) as the element A.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: February 24, 2015
    Assignee: Dexerials Corporation
    Inventors: Takamasa Izawa, Tsuneo Kusunoki
  • Patent number: 8961825
    Abstract: Provided herein are core-shell silica nanoparticles with a dense silica shell. The nanoparticles have improved properties such as, for example, increased photo luminescence and stability. Also provided are methods for making the nanoparticles.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: February 24, 2015
    Assignee: Cornell University
    Inventors: Ulrich B. Wiesner, Erik Herz, Hooisweng Ow
  • Patent number: 8956553
    Abstract: Provided is a fluorescent powder of halogen-silicate containing nano-metal particles with the formula of CaX2.y(Ca1-a-bEuaMnbO).SiO2:zM, wherein X is fluorin or/and chlorine, y is 1 or 2, z is molar ratio of nano-metal particles and fluorescent powder CaX2.y(Ca1-a-bEuaMnbO).SiO2, 0<z?1×10?2, 0<a?0.3, 0?b?0.3. The method for preparing the fluorescent powder is also provided. For the surface plasma resonance effect occurring on the surface of the nano-metal particles, the fluorescent powder has stronger luminous intensity. The preparation method is simple to operate, no pollution, easy to control, easy to produce in industry, and can be widely used in the preparation field of fluorescent powder.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: February 17, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Jun Liu, Wenbo Ma
  • Patent number: 8956554
    Abstract: A green light-emitting silicate phosphor comprising Eu-activated strontium barium silicate which has a crystal phase of magnesium oxide or a merwinite crystal phase and contains 0.15 to 0.90 mol of magnesium per one mol of silicon gives a light emission stable at elevated temperatures.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: February 17, 2015
    Assignee: Ube Materials Industries, Ltd.
    Inventors: Kouichi Fukuda, Jin Amagai, Toru Inagaki
  • Patent number: 8951441
    Abstract: Phosphors comprising a nitride-based composition represented by the chemical formula: M(x/v)(M?aM?b)Si(c-x)AlxNd:RE, wherein: M is a divalent or trivalent metal with valence v; M? is at least one divalent metal; M? is at least one trivalent metal; 2a+3b+4c=3d; and RE is at least one element selected from the group consisting of Eu, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb. Furthermore, the nitride-based composition may have the general crystalline structure of M?aM?bSicNd, where Al substitutes for Si within the crystalline structure and M is located within the crystalline structure substantially at the interstitial sites.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: February 10, 2015
    Assignee: Intematix Corporation
    Inventors: Yi-Qun Li, Dejie Tao, Shengfeng Liu
  • Patent number: 8951440
    Abstract: Embodiments of the present invention are directed to nitride-based, red-emitting phosphors in red, green, and blue (RGB) lighting systems, which in turn may be used in backlighting displays and warm white-light applications. In particular embodiments, the red-emitting phosphor is based on CaAlSiN3 type compounds activated with divalent europium. In one embodiment, the nitride-based, red emitting compound contains a solid solution of calcium and strontium compounds (Ca,Sr)AlSiN3:Eu2+, wherein the impurity oxygen content is less than about 2 percent by weight. In another embodiment, the (Ca,Sr)AlSiN3:Eu2+ compounds further contains a halogen in an amount ranging from about zero to about 2 atomic percent, where the halogen may be fluorine (F), chlorine (Cl), or any combination thereof. In one embodiment at least half of the halogen is distributed on 2-fold coordinated nitrogen (N2) sites relative to 3-fold coordinated nitrogen (N3) sites.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: February 10, 2015
    Assignee: Intematix Corporation
    Inventors: Shengfeng Liu, Dejie Tao, Xianglong Yuan, Yi-Qun Li
  • Patent number: 8945421
    Abstract: A surface-modified silicate luminophore includes a silicate luminophore and a coating includes at least one of (a) a fluorinated coating including a fluorinated inorganic agent, a fluorinated organic agent, or a combination of fluorinated inorganic and organic agents, the fluorinated coating generating hydrophobic surface sites and (b) a combination of the fluorinated coating and at least one moisture barrier layer. The moisture barrier layer includes MgO, Al2O3, Y2O3, La2O3, Gd2O3, Lu2O3, and SiO2 or the corresponding precursors, and the coating is disposed on the surface of the silicate luminophore.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: February 3, 2015
    Assignees: Seoul Semiconductor Co., Ltd., Litec-LP GmbH
    Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Detlef Starick
  • Patent number: 8936732
    Abstract: A white light emitting glass-ceramic. The chemical formula of the glass-ceramic is aSiO2.bAl2O3.cNaF.dCeF3.nDyF3.mAg, wherein a, b, c, d, n and m are, by mol part, 25-50, 15-30, 10-30, 10-25, 0.01-1 and 0.01-1, respectively, and a+b+c+d-100. A method for producing said glass-ceramic is also provided. Silver ion is doped in the glass-ceramic in the form of silver particles by means of sintering and reduction annealing treatment, and thus the luminescence properties of rare earth ion is improved.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: January 20, 2015
    Assignee: Ocean's King Lighting Science & Technology Co., Ltd.
    Inventors: Mingjie Zhou, Wenbo Ma, Fangyi Weng
  • Patent number: 8926863
    Abstract: The present invention provides a fluorescent substance excellent both in quantum efficiency and in temperature characteristics, and also provides a process for producing the fluorescent substance. This fluorescent substance is an oxynitride phosphor having a low paramagnetic defect density and comprising aluminum, silicon, either or both of oxygen and nitrogen, and a metal element M, provided that the metal element M is partly replaced with an emission center element R. That phosphor can be produced by the steps of: subjecting a mixture of starting materials to heat treatment under a nitrogen atmosphere so as to obtain an intermediate fired product, and then further subjecting the intermediate fired product to heat treatment under an atmosphere of nitrogen-hydrogen mixed gas.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: January 6, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yumi Fukuda, Naotoshi Matsuda, Ryosuke Hiramatsu
  • Patent number: 8926864
    Abstract: A method of producing ?-SiAlON includes a sintering process, in which ?-SiAlON starting materials, a mixture of silicon nitride, aluminum nitride, optically active element compound, and at least one compound selected from aluminum oxide and silicon oxide, are sintered at temperatures ranging from 1820° C. to 2200° C. The method provides new ?-SiAlON low in carbon content and having high luminescence intensity by placing a plurality of boron nitride vessels in a graphite box to allow the ?-SiAlON starting materials packed in the plurality of boron nitride vessels to easily come in contact with nitrogen gas, and performing sintering in nitrogen atmosphere.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: January 6, 2015
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masayoshi Ichikawa, Hideyuki Emoto
  • Publication number: 20150001445
    Abstract: The present invention provides a fluorescent substance excellent both in quantum efficiency and in temperature characteristics, and also provides a process for producing the fluorescent substance. This fluorescent substance is an oxynitride phosphor having a low paramagnetic defect density and comprising aluminum, silicon, either or both of oxygen and nitrogen, and a metal element M, provided that the metal element M is partly replaced with an emission center element R. That phosphor can be produced by the steps of: subjecting a mixture of starting materials to heat treatment under a nitrogen atmosphere so as to obtain an intermediate fired product, and then further subjecting the intermediate fired product to heat treatment under an atmosphere of nitrogen-hydrogen mixed gas.
    Type: Application
    Filed: August 6, 2014
    Publication date: January 1, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yumi FUKUDA, Naotoshi Matsuda, Ryosuke Hiramatsu
  • Patent number: 8920676
    Abstract: A luminescent cerium (Ce) doped compound emitting bright red light, comprising a calcium silicate nitride ternary system, such as CaSiN2-?O?:Ce3+, that crystallizes in a face-centered cubic unit cell with a lattice parameter of ˜a=14.88 ?. The Ce doped compound can be used for white light applications either: (i) to enhance the light quality of the system based on a blue LED with a yellow or green phosphor, (ii) as an orange phosphor in combination with a blue LED and a green phosphor, or (iii) as a red phosphor in a setup comprising a ultraviolet (UV) LED and red, green and blue (RGB) phosphors. Substitution of smaller elements on the Ca site or larger elements on the Si site leads to a decrease of the emission wavelength towards the yellow or orange region.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: December 30, 2014
    Assignee: The Regents of the University of California
    Inventors: Anthony K. Cheetham, Ronan P. Le Toquin
  • Patent number: 8906264
    Abstract: The invention relates to compounds of the general formula (I) EA2-xEuxSiO4.aM2B4O7 (I) where EA stands for two or more elements selected from Ca, Sr, Zn and Ba, M stands for Li, Na or K, and a stands for a value from the range 0.01?a?0.08, and x stands for a value from the range 0.01?x?0.25.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: December 9, 2014
    Assignee: Merck Patent GmbH
    Inventors: Tim Vosgroene, Daniela Degenring, Stefan Schlueter, Sascha Hess, Andrea Opolka, Eric Heiden
  • Patent number: 8906263
    Abstract: Provided according to embodiments of the invention are phosphor compositions that include Ca1-x-ySrxEuyAlSiN3, wherein x is in a range of 0.50 to 0.99 and y is less than 0.013. Also provided according to embodiments of the invention are phosphor compositions that include Ca1-x-ySrxEuyAlSiN3, wherein x is in a range of 0.70 to 0.99 and y is in a range of 0.001 and 0.025. Also provided are methods of making phosphors and light emitting devices that include a phosphor composition according to an embodiment of the invention.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: December 9, 2014
    Assignee: Cree, Inc.
    Inventors: Harry A. Seibel, II, Brian Thomas Collins, David Todd Emerson
  • Patent number: 8894884
    Abstract: Provided is a red emitting fluorescent material, which has a large excitation band and which is capable of efficiently emitting red fluorescence when excited by light emitted from an ultraviolet light emitting device and a blue light emitting device serving as an excitation source, in particular, even by use of an ultraviolet LED having an emission peak at near 390 nm to 400 nm, and which is capable of emitting red fluorescence when excited not only by ultraviolet and blue light from an ultraviolet light emitting device and a blue light emitting device but also by fluorescence emitted from a fluorescent material upon receipt these light beams, thereby emitting high brightness red light, and then, provided is a white light emitting device capable of emitting white light having excellent color reproducing and rendering properties.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: November 25, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ryo Yoshimatsu
  • Publication number: 20140332721
    Abstract: The invention belongs to the field of luminescent materials. Disclosed are silicate luminescent materials doped with metal nano particles and preparation methods there for. The silicate luminescent materials doped with metal nano particles are represented by the chemical formula:MLn1-xSiO4:xRE,yA; wherein M is one or two elements selected from Li, Na and K; Ln is one or two elements selected from Y, Sc, La and Lu; A is a metal nano particle selected from Ag, Au, Pt, Pd and Cu; RE is one or two ions selected from Eu, Gd, Tb, Tm, Sm, Ce and Dy; 0<x?0.1; 0<y?0.005. When silicate luminescent materials doped with metal nano particles of the invention are excitated by electron beam, they have higher luminescent efficiency. The luminescent materials are good to be used in field emission light source devices.
    Type: Application
    Filed: March 29, 2012
    Publication date: November 13, 2014
    Applicants: OCEAN'S KING LIGHTING SCIENCE & TECHNOLOGY CO., LTD., SHENZHEN OCEAN'S KING LIGHTING ENGINEERING CO., LTD.
    Inventors: Mingjie Zhou, Jun Liu, Rong Wang, Guitang Chen
  • Patent number: 8883041
    Abstract: A method for preparing a phosphor that comprises a crystalline oxide having M1O3 (M1 is a tetravalent metallic element) as a main framework thereof and essentially including a halogen element X (X is at least one element selected from a group consisting of F, Cl, Br, and I) and divalent metal ions M2 and Eu2+, includes using a compound represented by a compositional formula NH4X as a starting material when synthesizing the phosphor. At least a compound represented by a compositional formula NH4Cl may be used as the starting material.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: November 11, 2014
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Yasutaka Sasaki, Hisayoshi Daicho, Takeshi Iwasaki
  • Patent number: 8883039
    Abstract: A fluorophor which comprises as a main component, an ? type sialon crystal containing at least Li, A element (wherein A represents one or more elements selected from among Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm and Yb), M element (wherein M represents one or more metal elements except Li and the A element), Si, Al, oxygen and nitrogen. The fluorophor has an a type sialon crystal structure which is represented by the general formulae: (Lix1, Ax2, Mx3)(Si12?(m+n)Alm+n)(OnN16?n) 1.2?x1?2.4 (1) 0.001?x2?0.4 (2) and 0?x3?1.0 (3), and has a luminescence peak at a wavelength in the range of 400 to 700 nm. The above phosphor is reduced in the lowering of brightness, and can be suitably used for a white LED and the like.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: November 11, 2014
    Assignee: National Institute for Materials Science
    Inventors: Naoto Hirosaki, Rong-Jun Xie, Mamoru Mitomo
  • Patent number: 8877095
    Abstract: The embodiment provides a process for production of an oxynitride fluorescent substance. In the process, a compound represented by the formula: (Sr,Eu)2Si5N8, silicon nitride and aluminum nitride are mixed and then fired in a nitrogen atmosphere under high pressure.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: November 4, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naotoshi Matsuda, Yumi Fukuda, Masahiro Kato
  • Patent number: 8865023
    Abstract: Disclosed are a (halo)silicate-based phosphor and a manufacturing method of the same. More particularly, the disclosed phosphor is a novel (halo)silicate-based phosphor manufactured by using a (halo)silicate-based host material containing an alkaline earth metal, and europium as an activator.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: October 21, 2014
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Chang Hae Kim, Hwa Sung You, Kang Sik Choi
  • Patent number: 8858834
    Abstract: The invention relates to compounds of the formula (I): (Ca,Sr,Ba)1-x-yMeySiN2:Eux, where Me?Mn2+, Mg2+, Be2+, Ni2+, Co2+ and/or Ru2+; x=0.005 to 0.20; and y<1, and/or of the formula (II): (Ca,Sr,Ba)2-xSi1-zMazN2:Eux, where Ma?Hf4+, Th4+ and/or Zr4+; x=0.005 to 0.20; and z<1, and to a process for the preparation of these compounds, and to the use as phosphors and conversion phosphors for conversion of the blue or near-UV emission from an LED.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: October 14, 2014
    Assignee: MERCK PATENT GmbH
    Inventors: Holger Winkler, Ralf Petry, Thomas Vosgroene, Thomas Juestel, Arturas Kastelnikovas, Dominik Uhlich
  • Patent number: 8858835
    Abstract: The embodiment provides a red light-emitting fluorescent substance represented by the following formula (1): (M1-xECx)aM1bAlOcNd??(1). In the formula (1), M is an element selected from the group consisting of IA group elements, IIA group elements, IIIA group elements, IIIB group elements, rare earth elements and IVA group elements; EC is an element selected from the group consisting of Eu, Ce, Mn, Tb, Yb, Dy, Sm, Tm, Pr, Nd, Pm, Ho, Er, Cr, Sn, Cu, Zn, As, Ag, Cd, Sb, Au, Hg, Tl, Pb, Bi and Fe; M1 is different from M and is selected from the group consisting of tetravalent elements; and x, a, b, c and d are numbers satisfying the conditions of 0<x<0.2, 0.55<a<0.80, 2.10<b<3.90, 0<c?0.25 and 4<d<5, respectively. This substance emits luminescence having a peak in the wavelength range of 620 to 670 nm when excited by light of 250 to 500 nm.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: October 14, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Aoi Okada, Yumi Fukuda, Naotoshi Matsuda, Iwao Mitsuishi, Shinya Nunoue, Keiko Albessard, Masahiro Kato
  • Patent number: RE45502
    Abstract: To provide a phosphor having a broad emission spectrum with a peak in the range from yellow color to red color (wavelength from 570 nm to 620 nm), having a flat excitation band with large area on the long wavelength side from near ultraviolet/ultraviolet to green color (wavelength from 250 nm to 550 nm), and excellent in emission intensity and luminance, and a method of manufacturing the same, and also a light source such as white LED using the phosphor. As raw materials, Ca3N2(2N), AlN(3N), Si3N4(3N), and Eu2O3(3N) are prepared, and out of each raw material, 0.950/3 mol of Ca3N2, 2 mol of AlN, 4/3 mol of Si3N4, and 0.050/2 mol of Eu2O3 are weighed, and the raw materials thus weighed are mixed by using a mortar. The raw materials thus mixed are put in a BN crucible, and retained/fired for 3 hours at 1700° C. in a nitrogen atmosphere, and thereafter cooled from 1700° C. to 200° C., to thereby obtain the phosphor expressed by a composition formula Ca0.950Al2Si4O0.075N7.917:Eu0.050.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: May 5, 2015
    Assignees: Dowa Electronics Materials Co., Ltd., Nichia Corporation
    Inventors: Kenji Sakane, Akira Nagatomi