Compositions Containing Halogen; E.g., Halides And Oxyhalides Patents (Class 252/301.4H)
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Publication number: 20120286203Abstract: Novel core-shell nanoparticles comprising a phosphorescent core and metal shell as well as methods of synthesizing and using said core-shell nanoparticles are provided. In a preferred embodiment, the phosphorescent core comprises an upconverting phosphor and the shell comprises gold.Type: ApplicationFiled: December 16, 2010Publication date: November 15, 2012Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Ian M. Kennedy, Sudheendra Lakshmana
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Publication number: 20120273726Abstract: A halide scintillator material is disclosed where the halide may comprise chloride, bromide or iodide. The material is single-crystalline and has a composition of the general formula ABX3 where A is an alkali, B is an alkali earth and X is a halide which general composition was investigated. In particular, crystals of the formula ACa1-yEuyI3 where A=K, Rb and Cs were formed as well as crystals of the formula CsA1-yEuyX3 (where A=Ca, Sr, Ba, or a combination thereof and X?Cl, Br or I or a combination thereof) with divalent Europium doping where 0?y?1, and more particularly Eu doping has been studied at one to ten mol %. The disclosed scintillator materials are suitable for making scintillation detectors used in applications such as medical imaging and homeland security.Type: ApplicationFiled: January 17, 2012Publication date: November 1, 2012Applicant: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATIONInventors: Mariya Zhuravleva, Kan Yang
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Publication number: 20120256126Abstract: Phosphorescent compositions including silicate of alkaline earth materials which are modified by at least one halide are provided. The phosphorescent compositions may include 3d ions. A variety of embodiments may be realized. The appearance of some embodiments may be glassy (i.e., vitreous).Type: ApplicationFiled: April 7, 2011Publication date: October 11, 2012Applicant: PERFORMANCE INDICATOR, LLCInventor: Weiyi Jia
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Patent number: 8277687Abstract: The present invention relates to a phosphor that satisfies requirements (1) to (3): (1) the phosphor satisfies Formula [2] and/or Formula [3]: 85?{R455(125)/R455(25)}×100?110??[2] 92?{R405(100)/R405(25)}×100?110??[3] wherein R455(125) represents an emission peak intensity when the phosphor is excited by light having a peak wavelength of 455 nm at 125° C., (2) the emission peak wavelength is in the range of 570 nm to 680 nm, and (3) the full width at half maximum of an emission peak is 90 nm or less. The phosphor of the present invention has a high luminous efficiency and emits light of orange to red with high luminance. The use of the phosphor makes it possible to produce a light-emitting device, an illumination apparatus, and an image display, having a high efficiency and excellent color rendering properties.Type: GrantFiled: August 10, 2006Date of Patent: October 2, 2012Assignee: Mitsubishi Chemical CorporationInventors: Tomoko Takahashi, Nobuhiro Kodama, Yasuo Shimomura, Naoto Kijima, Tomoyuki Kurushima, Takashi Hase, Eiji Hattori, Kouichi Adachi, Keiichi Seki, Yutaka Mori
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Publication number: 20120228550Abstract: Provided are a method for preparing a rare-earth doped alkaline-earth silicon nitride phosphor powder having the composition of Me2-xRxSi5N8-yF3y (0<x<1.0, 0?y<0.5) within seconds at ambient temperature; the nitride phosphor prepared therefrom; and a light emitting device comprising the phosphor. Such silicon nitride based phosphors having small particle size, large surface area and improved chemical properties can strongly absorb UV and blue light and efficiently convert it into orange-red light, so that they can be used as an effective phosphor to form a smooth layer without sedimentation in a LED package, and as light sources and displays. Especially for applying the fine particles to a LED package, cost reduction can be achieved with respect to the weight ratio.Type: ApplicationFiled: October 19, 2010Publication date: September 13, 2012Applicant: ELLIM ADVANCED MATERIALS CO., LTD.Inventors: Chang Whan Won, Hyung II Won, Hyung Suk Won, Hayk Nersisyan
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Patent number: 8262935Abstract: A phosphor includes a composition represented by the formula: (M2x, M3y, M4z)mM1O3X(2/n), wherein M1 is Si and may include at least one element selected Ge, Ti, Zr, and Sn; M2 is Ca and may include at least one element selected Mg, Ba, and Zn; M3 is Sr and may include at least one element selected from the group consisting of Mg, Ba, and Zn; X is at least one kind of halogen element; M4 is Eu2+ and may includes at least one element rare-earth elements and Mn, wherein m is in a range of 6/6?m?8/6; n is in a range of 5?n?7; and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01?z?0.3.Type: GrantFiled: July 19, 2010Date of Patent: September 11, 2012Assignee: Koito Manufacturing Co., Ltd.Inventors: Hisayoshi Daicho, Takeshi Iwasaki, Kiminori Enomoto, Yu Shinomiya, Shinobu Aoyagi
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Publication number: 20120187338Abstract: 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: ApplicationFiled: September 3, 2010Publication date: July 26, 2012Applicant: Korea Research Institute of Chemical TechnologyInventors: Chang Hae Kim, Hwa Sung You, Kang Sik Choi
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Patent number: 8211334Abstract: Orange-red phosphors activated by europium and rare earth ions of formula I and formula II are long persistent, stable, and non-toxic M1F2-M1S: Eu2+, Ln3+??(I) M23M32O5X2: inside or outside Eu2+, Ln3+??(II) wherein M1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof; M2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof; M3 is Al, Ga, B, In, or a combination thereof; X is F, Cl, Br, I, or a combination thereof; and Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.Type: GrantFiled: October 27, 2009Date of Patent: July 3, 2012Assignee: General Electric CompanyInventors: Alok Mani Srivastava, Holly Ann Comanzo, Claire Susan Henderson
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Publication number: 20120161074Abstract: A scintillator material contains a compound represented by a general formula [Cs1-zRbz][I1-x-yBrxCly]:In. In the general formula, x, y, and z satisfy any one of conditions (1), (2), and (3) below. (1) When 0<x+y<1 and z=0, at least one of Mathematical formula 1 and Mathematical formula 2 is satisfied. (2) When 0<x+y<1 and 0<z<1, at least one of Mathematical formula 3 and 0<y<1 is satisfied. (3) When x=y=0, the relationship 0<z<1 is satisfied. The content of indium (In) is 0.00010 mole percent or more and 1.0 mole percent or less relative to [Cs1-zRbz][I1-x-yBrxCly]. [Math. 1] 0<x?0.7??(Math. 1) 0<y?0.8??(Math. 2) 0<x?0.8??(Math.Type: ApplicationFiled: August 31, 2010Publication date: June 28, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Patent number: 8187495Abstract: A light emitting device is provided. The light emitting device includes a light emitting element that emits ultraviolet light or short-wavelength visible light; and at least one phosphor that is excited by the ultraviolet light or short-wavelength visible light to emit visible light. The at least one phosphor includes a first phosphor including a composition represented by the formula: M1O2.aM2O.bM3X2:M4, where M1 is at least one element selected from the group consisting of Si, Ge, Ti, Zr, and Sn; M2 is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn; M3 is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn; X is at least one halogen element; M4 is at least one element essentially including Eu2+ selected from the group consisting of rare-earth elements and Mn; a is in the range of 0.1?a?1.3; and b is in the range of 0.1?b?0.25.Type: GrantFiled: July 14, 2008Date of Patent: May 29, 2012Assignee: Koito Manufacturing Co., Ltd.Inventors: Hisayoshi Daicho, Takeshi Iwasaki, Kiminori Enomoto
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Publication number: 20120119145Abstract: Energy down conversion phosphors represented by the chemical formula Ca1+xSr1?xGayIn2?ySzSe3?zF2 where (0?x?1, 0?y?2, 0?z?3) doped with rare earth and/or transition metal elements is disclosed. Dopant impurities may be one or more species such as Eu, Ce, Mn, Ru, and/or mixtures thereof present as activators. The molar fractions x, y and z, the dopant species and the dopant concentration may be varied to tune the peak emission wavelength and/or the width of the emission peak.Type: ApplicationFiled: November 10, 2011Publication date: May 17, 2012Applicant: Auterra, Inc.Inventor: Partha S. Dutta
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Patent number: 8178000Abstract: Disclosed is a deep red phosphor (600 nm to 670 nm) of Mn activity having a chemical formula of (k-x)MgOxAF2GeO2:yMn4+ where k is a real number between 2.8 and 5.0, x is a real number between 0.1 and 0.7, y is a real number between 0.005 and 0.015, and A is Ca, Sr, Ba, Zn, or a mixture thereof, or a mixture of Mg and at least one of Ca, Sr, Ba and Zn. The deep red phosphor has a high excitation efficiency and thus can be applied to light emitting diode (LED) packages, which uses an ultraviolet (UV) light source or a blue light source as an excitation light source. The deep red phosphor is applied to a phosphor layer of a phosphor lamp such as a cold cathode fluorescence lamp (CCFL) and a flat fluorescent lamp (FFL).Type: GrantFiled: February 8, 2008Date of Patent: May 15, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Tae Gon Kim, Kubota Shunichi, Young Sic Kim, Seung Jae Im, Jae Ho Lee
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Patent number: 8168086Abstract: A light emitting device comprising a light producing element configured to generate ultraviolet light having a wavelength of from about 250 nm to about 400 nm and a self-activating phosphor comprising an ordered oxyfluoride compound is provided. The nitrogen-free or nitrogen-containing ordered oxyfluoride compound has a formula: A3-3a/2RaMO4-?1-w?F1-?2-w—Nw where A is Sr alone or Sr mixed with Ba and/or Ca such that A comprises at least about ? mole % of Sr and up to about ? mole percent of Ba and/or Ca; R is a rare earth element or a mixture of rare earth elements; M is Al, Ga, In, W, Mo, Bi, or mixtures thereof; 0<a?0.3; ?1 and ?2 are both from about 0.01 to about 0.1; and 0?w?0.05 such that 0?w??0.1 and 0?w??0.15. The ultraviolet light excites the self-activating phosphor such that the self-activating phosphor emits visible light having a wavelength of from about 380 to about 750 nm.Type: GrantFiled: June 2, 2009Date of Patent: May 1, 2012Assignee: University of South CarolinaInventors: Thomas Vogt, Sangmoon Park
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Patent number: 8168085Abstract: Materials suitable for use in highly energy-efficient production of white light through photo-luminescence, such as in light emitting devices, are generally provided. A composition comprising a compound having the formula: Sr3-vAvMO4-xF1-ywherein A is Ca, Ba, or a mixture thereof; M is Al, Ga, In, W, Mo, or a mixture thereof; 0?v?1; 0<x<0.4; and 0<y<0.2 is generally described. A composition comprising a compound having the formula: Sr3-vAvIn1-mMmO4-xF, where A is Ca, Ba, or a mixture thereof; M is Al, Ga, W, Mo, or a mixture thereof; 0?v?1; 0<m<1; and 0<x<4 is also provided. Nitrogen can be substituted for a portion of the oxygen atoms in these structures. Methods introducing defects into a compound by removing a portion of oxygen and fluorine atoms from the compound are also provided.Type: GrantFiled: January 5, 2009Date of Patent: May 1, 2012Assignee: University of South CarolinaInventors: Thomas Vogt, Sangmoon Park
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Publication number: 20120074356Abstract: [Problems to be Solved] The present invention aims to provide a scintillator which can detect photons of high energy, such as hard X-rays or ?-rays, with high sensitivity. [Means to Solve the Problems] A scintillator comprises lithium lutetium fluoride containing neodymium as a luminescence center, the lithium lutetium fluoride being represented by the chemical formula LiLu1-xNdxF4 where x is in the range of 0.00001 to 0.2, preferably, 0.0001 to 0.05. Preferably, the scintillator comprises a single crystal of the lithium lutetium fluoride containing neodymium.Type: ApplicationFiled: June 1, 2010Publication date: March 29, 2012Inventors: Kentaro Fukuda, Sumito Ishizu, Toshihisa Suyama, Akira Yoshikawa, Takayuki Yanagida, Yui Yokota, Noriaki Kawaguchi
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Method of manufacturing blue silicate phosphor, and blue silicate phosphor and light-emitting device
Patent number: 8142684Abstract: The present invention provides a method of manufacturing a blue silicate phosphor having high luminance and a chromaticity y comparable to or lower than that of BAM:Eu. The present invention is a method of manufacturing a blue silicate phosphor represented by the general formula aAO.bEuO.(Mg1?w,Znw)O.cSiO2.dCaCl2, where A is at least one selected from Sr, Ba and Ca, and 2.970?a?3.500, 0.006?b?0.030, 1.900?c?2.100, 0?d?0.05, and 0?w?1 are satisfied. In this manufacturing method, heat treatment is carried out in a gas atmosphere having an oxygen partial pressure of 1×10?15.5 atm to 1×10?10 atm at a temperature of 1200° C. to 1400° C.Type: GrantFiled: May 16, 2007Date of Patent: March 27, 2012Assignee: Panasonic CorporationInventors: Seigo Shiraishi, Kojiro Okuyama, Masahiro Sakai, Takehiro Zukawa -
Patent number: 8137586Abstract: 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: GrantFiled: November 25, 2008Date of Patent: March 20, 2012Assignee: Osram Sylvania Inc.Inventors: Albert M. Cavallaro, Robert E. Levin, Chung-Nin Chau, Roger B. Hunt, Jr.
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Patent number: 8066908Abstract: A method of preparing a lanthanide-doped nanoparticle sol-gel matrix film having a high signal to noise ratio is provided. The sol-gels are also provided. A method of preparing light emitting sol-gel films made with lanthanide doped nanoparticles, for the production of white light is also provided. The method comprises selecting lanthanides for the production of at least one of green, red and blue light when excited with near infrared light, preparing nanoparticles comprising the selected lanthanides, stabilizing the nanoparticles with ligands operative to stabilize the nanoparticles in an aqueous solution and selected to be substantially removed from the sol-gel matrix film during synthesis, incorporating the stabilized nanoparticles into a sol-gel matrix and heating to increase the signal to noise ratio of the luminescence by substantially removing the low molecular weight organic molecules. Additionally, light emitting sol-gel films made with lanthanide doped nanoparticles are provided.Type: GrantFiled: April 26, 2006Date of Patent: November 29, 2011Assignee: UVic Industry Partnerships Inc.Inventors: Franciscus C. J. M. van Veggel, Sri Sivakumar, Thampi V. Sudarsan
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Patent number: 8057706Abstract: A phosphor material contains encapsulated particles of manganese (Mn4+) doped fluoride phosphor. A method of encapsulating such particles is also provided. Each particle is encapsulated with a layer of a manganese-free fluoride phosphor. The use of such a phosphor material in a lighting apparatus results in improved stability and acceptable lumen maintenance over the course of the apparatus life.Type: GrantFiled: July 27, 2010Date of Patent: November 15, 2011Assignee: General Electric CompanyInventors: Anant Achyut Setlur, Oltea Puica Siclovan, Robert Joseph Lyons, Ljudmil Slavchev Grigorov
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Publication number: 20110210291Abstract: The present invention is directed to rare-earth doped solid state solutions of alkaline earth fluorides having novel luminescence properties, and to a process for preparing them. The invention is useful as identifying markers on articles. Other uses include phosphors for plasma displays, optical frequency multipliers, optical amplifiers and the like.Type: ApplicationFiled: February 4, 2011Publication date: September 1, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: MICHAEL KARL CRAWFORD, Kurt Richard Mikeska
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Publication number: 20110175028Abstract: A garnet-type single crystal is represented by a general formula, A3B2C3O12 (having a crystal structure with three sites A, B and C occupied by cations, wherein A represents an element occupying the site A, B represents an element occupying the site B, C represents an element occupying the site C, O represents an oxygen atom), and contains fluorine, in which the fluorine attains any one or both of substituting for the oxygen atom or compensating for oxygen defect.Type: ApplicationFiled: July 24, 2009Publication date: July 21, 2011Inventors: Kiyoshi Shimamura, Encarnacion Garcia Villora, Yasuhiko Kuwano
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Patent number: 7955524Abstract: A phosphor can be excited by UV, purple or blue light LED, its preparation method, and light emitting devices incorporating the same. The phosphor contains rare earth, silicon, alkaline-earth metal, halogen, and oxygen, as well as aluminum or gallium. Its General formula of is aLn2O3.MO.bM?2O3.fSiO2.cAXe:dR, wherein Ln is at least one metal element selected from a group consisting of Sc, Y, La, Pr, Nd, Gd, Ho, Yb and Sm; M is at least one metal element selected from a group consisting of Ca, Sr and Ba; M? is at least one metal element selected from Al and Ga; A is at least one metal element selected from a group consisting of Li, Na, K, Mg, Ca, Sr and Ba; X is at least one element selected from F and Cl; R is at least one metal element selected from a group consisting of Ce, Eu, Tb and Mn; 0.01?a?2, 0.35?b?4, 0.01?c?1, 0.01?d?0.3, 0.01?f?3, 0.6?e?2.4. The phosphor has broad emitting range, high efficiency, better uniformity and stability.Type: GrantFiled: September 19, 2008Date of Patent: June 7, 2011Assignees: General Research Institute for Nonferrous Metals, Beijing, Grirem Advanced Materials Co., Ltd.Inventors: Weidong Zhuang, Yunsheng Hu, Zhen Long, Xiaowei Huang, Hongwei Li, Shusheng Zhang, Huagiang He
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Patent number: 7938984Abstract: The invention is directed to a composition having a carrier matrix, and a particulate luminescent composition dispersed therein, the particulate luminescent composition comprising a rare-earth-doped solid-state solution of alkaline earth fluorides represented by the chemical formula REx(CaaSrbBac)1?xF2+x?2yOy wherein RE represents a three-valent rare-earth element, 0.005?x?0.20, and 0?y?0.2, a+b+c=1, with the proviso at least two of a, b, and c are not equal to zero; the particulate luminescent composition exhibiting a luminescence spectrum having a plurality of intensity peaks at characteristic wavelengths. It is further directed to a process by contacting a surface with the composition and articles made therefrom.Type: GrantFiled: December 12, 2007Date of Patent: May 10, 2011Assignee: E.I. du Pont de Nemours and CompanyInventors: Michael Karl Crawford, Kurt Richard Mikeska
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Publication number: 20110101273Abstract: Methods for synthesizing a phosphor which is capable of upconversion fluorescence. One exemplary method includes forming a rare earth hydroxide and exposing the rare earth hydroxide to a fluorine source to produce a rare earth fluoride. Another exemplary method includes fluorinating a rare earth hydroxide without use of F2 or HF to produce a rare earth fluoride and purifying the rare earth fluoride.Type: ApplicationFiled: December 10, 2010Publication date: May 5, 2011Inventor: Robert Rewick
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Publication number: 20110101272Abstract: Phosphor compositions comprising a solid solution series between Sr3AlO4F and Sr3SiO5 and a solid solution series between Sr3AlO4F and GdSr2AlO5, are disclosed. A white light emitting LED using the phosphor compositions is also disclosed.Type: ApplicationFiled: October 13, 2010Publication date: May 5, 2011Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars
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Publication number: 20110084233Abstract: The scintillation material is a compound of the general formula LnX3:D, in which Ln is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and/or Lu; X is F, Cl, Br or I, and D is at least one cation of elements Y, Zr, Pd, Hf and Bi as dopant and is contained in the material in an amount of 10 ppm to 10,000 ppm. When the scintillation material includes the preferred CeBr3 and Bi as a cationic dopant, it also includes at least one other cation of the elements Y, Zr, Pd and Hf. The scintillation material may be in single crystal or polycrystalline form.Type: ApplicationFiled: October 7, 2010Publication date: April 14, 2011Inventors: Johann-Christoph Von Saldern, Christoph Seitz, Lutz Parthier, Jochen Alkemper
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Publication number: 20110084234Abstract: The scintillation material has a maximum oxygen content of 2,500 ppm and is a compound of formula LnX3 or LnX3:D, wherein Ln is at least one rare earth element, X is F, Cl, Br, or I; and D is at least one cationic dopant of one or more of the elements Y, Zr, Pd, Hf and Bi and, if present, is present in an amount of 10 ppm to 10,000 ppm. The process of making the scintillation material includes optionally mixing the compound of the formula LnX3 with the at least one cationic dopant, heating the compound or the mixture so obtained to a melting temperature to form a melt, adding one or more carbon halides and then cooling the melt to form a crystal or crystalline structure. The maximum oxygen content of the scintillation material is preferably 1000 ppm.Type: ApplicationFiled: October 7, 2010Publication date: April 14, 2011Inventors: Johann-Christoph Von Saldern, Christoph Seitz, Lutz Parthier, Jochen Alkemper
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Patent number: 7901593Abstract: The present invention is directed to rare-earth doped solid state solutions of alkaline earth fluorides having novel luminescence properties, and to a process for preparing them. The invention is useful as identifying markers on articles. Other uses include phosphors for plasma displays, optical frequency multipliers, optical amplifiers and the like.Type: GrantFiled: December 12, 2007Date of Patent: March 8, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Michael Karl Crawford, Kurt Richard Mikeska
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Publication number: 20110042616Abstract: The scintillation materials may exist in single crystalline, polycrystalline or ceramic form. Preferably, the scintillation materials are in single crystalline form. According to the present invention all cation-forming elements are present in the scintillation material in an amount, which is higher than stoichiometric (hyper- or over-stoichiometric) with respect to the anion-forming elements.Type: ApplicationFiled: August 20, 2010Publication date: February 24, 2011Inventors: Christoph Seitz, Johann-Christoph Von Saldern, Tilo Aichele
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Publication number: 20110024683Abstract: For a continuous process for preparing rare-earth doped Group 2 or Group 3 metal fluoride nanoparticles comprising a confluence of feed streams of reagents, a method is provided for controlling particle size by adjustment in the flow rate of the streams.Type: ApplicationFiled: August 3, 2009Publication date: February 3, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventor: PAUL GREGORY BEKIARIAN
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Publication number: 20110012059Abstract: Photoluminescent phosphors wherein some of the oxygen anions in the phosphor matrix have been replaced by halides or nitride. In addition, photoluminescent phosphors wherein some of the oxygen anions in the phosphor matrix have been replaced by halides or nitride and a charge compensator has been included. The phosphors are based on green emitting and blue-green emitting aluminates.Type: ApplicationFiled: July 15, 2009Publication date: January 20, 2011Inventor: Weiyi JIA
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Patent number: 7771619Abstract: Optically transparent composite materials in which solid solution inorganic nanoparticles are dispersed in a host matrix inert thereto, wherein the nanoparticles are doped with one or more active ions at a level up to about 60 mole % and consist of particles having a dispersed particle size between about 1 and about 100 nm, and the composite material with the nanoparticles dispersed therein is optically transparent to wavelengths at which excitation, fluorescence or luminescence of the active ions occur. Luminescent devices incorporating the composite materials are also disclosed.Type: GrantFiled: June 21, 2006Date of Patent: August 10, 2010Assignee: Rutgers, The State UniversityInventors: Richard E. Riman, John Ballato
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Publication number: 20100171075Abstract: A scintillator having a host lattice of MgAl2O4 was prepared by hot pressing under a vacuum environment a powder mixture of MgAl2O4, CeO2, and LiF.Type: ApplicationFiled: January 8, 2009Publication date: July 8, 2010Inventor: Ching-Fong Chen
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Publication number: 20100155665Abstract: A nano phosphor prepared by mixing a metal oxide nanoparticle and inorganic salt, a method of preparing the nano phosphor, and a display device including the nano phosphor. The method includes dissolving the inorganic salt in a solvent, adding the metal oxide nanoparticles to the solution, and annealing the resultant mixture, preferably under pressure. Such a process removes defects in the crystal structure of the nano phosphor, resulting in improved luminescent efficiency when incorporated into a display device.Type: ApplicationFiled: December 17, 2009Publication date: June 24, 2010Applicant: Samsung SDI Co., Ltd.Inventors: Hyun-sik Kim, Soon-jae Kwon, Soo-yeon Seo, Gyeong-su Park
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Patent number: 7700003Abstract: A method is provided that includes heating a powder to a temperature that is below the melting point of the scintillator composition but is sufficiently high to form a coherent mass. The powder includes a scintillator composition. The coherent mass is polycrystalline and has a pulse height resolution that is less than 20 percent at 662 kilo electron volts; a light yield of more than 5000 photons per milli electron volt; or both a pulse height resolution that is less than 20 percent at 662 kilo electron volts and a light yield of more than 5000 photons per milli electron. A sintered body is provided also.Type: GrantFiled: January 30, 2007Date of Patent: April 20, 2010Assignee: General Electric CompanyInventors: Sergio Paulo Martins Loureiro, Alok Mani Srivastava, Kevin Paul McEvoy, Venkat Subramaniam Venkataramani, Steven Jude Duclos, James Scott Vartuli, Carl Joshua Vess
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Publication number: 20100032623Abstract: A method for producing a garnet phosphor that includes using cryolites as the flux. In particular YAG:Ce is suitable as the garnet.Type: ApplicationFiled: July 9, 2009Publication date: February 11, 2010Applicant: OSRAM Gesellschaft Mit beschrankkter HaftungInventor: Stefan LANGE
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Publication number: 20100019200Abstract: A method wherein an aqueous solution of a fluoride, an aqueous solution of a Group 2 or Group 3 metal salt, and an aqueous solution of a rare-earth metal dopant are combined in a plurality of continuous feed streams to form a series of precipitates of a rare-earth doped Group 2 or Group 3 metal fluoride, and wherein the member of the series differ by the concentration of the associated rare-earth dopant cation in the feed stream, and wherein the series so prepared defines the threshold concentration range above which operation of the process results in a minimization of the particle size variability caused by small perturbations in the concentration of the rare-earth dopant.Type: ApplicationFiled: August 3, 2009Publication date: January 28, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, DANIEL ALBERT GREEN, KURT RICHARD MIKESKA, PAUL GREGORY BEKIARIAN
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Patent number: 7651633Abstract: Nanophosphor compositions were prepared. The compositions can be used for radiation detection.Type: GrantFiled: March 27, 2007Date of Patent: January 26, 2010Assignee: Los Alamos National Security, LLCInventors: Anthony K. Burrell, Kevin C. Ott, John C. Gordon, Rico E. Del Sesto, T. Mark McCleskey
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Publication number: 20100012898Abstract: A method wherein an aqueous solution of a fluoride, an aqueous solution of a Group 2 or Group 3 metal salt, and an aqueous solution of a rare-earth metal dopant are combined to form a precipitate of a rare-earth doped Group 2 or Group 3 metal fluoride, and wherein increasing the concentration of the rare-earth dopant cation increases the resulting particle size, and wherein decreasing the concentration of the rare-earth dopant cation decreases the particle size.Type: ApplicationFiled: August 3, 2009Publication date: January 21, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, DANIEL ALBERT GREEN, KURT RICHARD MIKESKA, PAUL GREGORY BEKIARIAN
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Patent number: 7648649Abstract: Light emitting devices including backlights having a light source and a phosphor material including a complex fluoride phosphor activated with Mn4+ which may include at least one of (A) A2[MF5]:Mn4+; where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (B) A3[MF6]:Mn4+, where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (C) Zn2[MF7]:Mn4+, where M is selected from Al, Ga, In, or combinations thereof; and (D) A[In2F7]:Mn4+ where A is selected from Li, Na, K, Rb, Cs, NH4, or combinations thereof.Type: GrantFiled: February 13, 2007Date of Patent: January 19, 2010Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Ljudmil Slavchev Grigorov
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Patent number: 7641815Abstract: Luminescent materials and the use of such materials in anti-counterfeiting, inventory, photovoltaic, and other applications are described herein. In one embodiment, a luminescent material has the formula: [AaBbXxX?x?X?x?][dopants], wherein A is selected from at least one of elements of Group IA; B is selected from at least one of elements of Group VA, elements of Group IB, elements of Group IIB, elements of Group IIIB, elements of Group IVB, and elements of Group VB; X, X?, and X? are independently selected from at least one of elements of Group VIIB; the dopants include electron acceptors and electron donors; a is in the range of 1 to 9; b is in the range of 1 to 5; and x, x?, and x? have a sum in the range of 1 to 9. The luminescent material exhibits photoluminescence having: (a) a quantum efficiency of at least 20 percent; (b) a spectral width no greater than 100 nm at Full Width at Half Maximum; and (c) a peak emission wavelength in the near infrared range.Type: GrantFiled: March 21, 2007Date of Patent: January 5, 2010Assignee: Ultradots, Inc.Inventors: John Varadarajan, Mirna Resan, Fanxin Wu, William M. Pfenninger, Nemanja Vockic, John Kenney
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Patent number: 7625502Abstract: Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.Type: GrantFiled: March 26, 2007Date of Patent: December 1, 2009Assignee: General Electric CompanyInventors: Brent Allen Clothier, Sergio Paulo Martins Loureiro, Alok Srivastava, Venkat Subramaniam Venkataramani
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Patent number: 7625503Abstract: The invention is directed a composition represented by the chemical formula EuxA1?xF2+x?2yOy wherein A is alkaline earth, 0.002?x?0.20, and 0?y?x; the composition exhibiting a luminescence spectrum characterized by peaks at 592±2 nm and 627±2 nm, wherein the ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% larger than the corresponding peak intensity ratio at the same wavelengths of a first corresponding reference composition with the same value of x that has not been exposed to a temperature above 100° C., and wherein said ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% smaller than the corresponding peak intensity ratio at the same wavelengths of a second corresponding reference composition with the same value of x that has been subject to heating to 900° C. for 6 hours.Type: GrantFiled: May 17, 2007Date of Patent: December 1, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: Changzai Chi, Michael Karl Crawford, Kurt Richard Mikeska
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Publication number: 20090283721Abstract: Embodiments of the present invention are directed to the fluorescence of a nitride-based deep red phosphor having at least one of the following novel features: 1) an oxygen content less than about 2 percent by weight, and 2) a halogen content. Such phosphors are particularly useful in the white light illumination industry, which utilizes the so-called “white LED.” The selection and use of a rare earth halide as a raw material source of not only the activator for the phosphor, but also the halogen, is a key feature of the present embodiments. The present phosphors have the general formula MaMbBC(N,D):Eu2+, where Ma is a divalent alkaline earth metal such as Mg, Ca, Sr, Ba; Mb is a trivalent metal such as Al, Ga, Bi, Y, La, and Sm; and Mc is a tetravalent element such as Si, Ge, P, and B; N is nitrogen, and D is a halogen such as F, Cl, or Br. An exemplary compound is CaAlSi(N1-xFx): Eu2+.Type: ApplicationFiled: October 13, 2008Publication date: November 19, 2009Applicant: Intematix CorporationInventors: Shengfeng Liu, Dejie Tao, Xianglong Yuan, Yi-Qun Li
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Patent number: 7608201Abstract: Inorganic scintillator material of formula AnLnpX(3p+n) in which has a very low nuclear background noise and is particularly suitable as a detector scintillator for coating weight or thickness measurements, in the fields of nuclear medicine, physics, chemistry and oil exploration, and for the detection of dangerous or illicit materials.Type: GrantFiled: April 12, 2005Date of Patent: October 27, 2009Assignee: Saint-Gobain Cristaux et DetecteursInventor: Alain Iltis
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Publication number: 20090173915Abstract: A light-storing phosphor prepared from a matrix (host) based on the element of aluminate of group IIA and activated by Eu+2 and La+3, and characterized in that the composite of the light-storing phosphor contains group VII elements F?1, Cl?1, Mn+2 and has the total stoichiometric equation of: (Me1?xEuxO)?(Al2?y?zLn+3yMn+2zO3?zHalz)?, in which Me=Sr and/or Ba and/or Ca and/or Mg, Ln=Dy and/or Nd and/or Ce, Hal=F and/or Cl. The invention also provides a light-storing phosphor preparation method, which is based on an alkali fusion product and which employs a heat treatment to hydroxides under the presence of a gas of weak reduction type to maintain fine dispersibility of the product.Type: ApplicationFiled: January 8, 2008Publication date: July 9, 2009Inventors: Soshchin Naum, Wei-Hung Lo, Chi-Ruei Tsai
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Publication number: 20090166585Abstract: The present invention provides for a composition comprising an inorganic scintillator comprising a gadolinium halide, optionally cerium-doped, having the formula AnGdXm:Ce; wherein A is nothing, an alkali metal, such as Li or Na, or an alkali earth metal, such as Ba; X is F, Br, Cl, or I; n is an integer from 1 to 2; m is an integer from 4 to 7; and the molar percent of cerium is 0% to 100%. The gadolinium halides or alkali earth metal gadolinium halides are scintillators and produce a bright luminescence upon irradiation by a suitable radiation.Type: ApplicationFiled: October 30, 2008Publication date: July 2, 2009Applicant: The Regents of the University of CaliforniaInventors: Edith Bourret-Courchesne, Stephen E. Derenzo, Shameka Parms, Yetta D. Porter-Chapman, Latoria K. Wiggins
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Publication number: 20090127508Abstract: An luminescent composition comprises a mixture of two or more materials, emitting electromagnetic radiation when subject to stimuli, wherein the spectral emission is not calculable at a first approximation as the simple weighted sum of the spectral emissions of the materials independently subject to said stimuli. Especially advantageous compositions are achieved if the anionic matrix is an oxide and the doping anionic salt is a fluoride or vice versa.Type: ApplicationFiled: April 20, 2006Publication date: May 21, 2009Applicants: ETeCH AG, Technische Universitacy WienInventor: Frank Kubel
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Publication number: 20090121188Abstract: [PROBLEMS] To provide a scintillator responding to high counting rate sustaining high-speed and high detection efficiency of BaF2 and to provide a radiation detection device with high time resolution by using the scintillator. [MEANS FOR SOLVING PROBLEMS] A specified amount of rare earth element (Eu) is doped into BaF2 to reduce long decay lifetime component (600 to 620 nm), leaving fast decaying component (0.6 to 0.8 ns) of BaF2 luminescence unchanged. The present invention is a high counting rate scintillator for detecting radiation comprising BaF2 doped with rare earth elements (Eu), wherein the doping amount is in the range of 0.02 to 1.0 mol %.Type: ApplicationFiled: January 27, 2006Publication date: May 14, 2009Inventors: Masanori Koshimizu, Kengo Shibuya, Haruo Saito, Keisuke Asai, Tsuneo Honda
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Publication number: 20090095940Abstract: Embodiments of the present disclosure include Gd3+—Nd3+ infrared phosphor compositions, methods of making Gd3+—Nd3+ infrared phosphor compositions, and the like.Type: ApplicationFiled: July 7, 2008Publication date: April 16, 2009Inventors: Richard S. Meltzer, Sergey Feofilov, Yi Zhou, Douglas Keszler, Joayoung Jeong, Weiyi Jia