Patents by Inventor Gundula Roth
Gundula Roth has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8070984Abstract: A luminescent material is disclosed. The luminescent material may include a first compound having a host lattice comprising first ions and oxygen. A first portion of the first ions may be substituted by copper ions. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and the first compound may have an Olivin crystal structure, a ?-K2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the ultraviolet or visible light.Type: GrantFiled: November 30, 2007Date of Patent: December 6, 2011Assignee: Seoul Semiconductor Co., Ltd.Inventors: Gundula Roth, Walter Tews, Chung-Hoon Lee
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Patent number: 8066909Abstract: A light emitting device is disclosed. The light emitting device may include a light emitting diode (LED) for emitting light and a phosphor adjacent to the LED. The phosphor may be excitable by light emitted by the LED and may include a first compound having a host lattice comprising first ions and oxygen. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and the first compound may have an Olivin crystal structure, a ?-K2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the light emitted by the LED.Type: GrantFiled: November 30, 2007Date of Patent: November 29, 2011Assignee: Seoul Semiconductor Co., Ltd.Inventors: Gundula Roth, Walter Tews, Chung-Hoon Lee
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Publication number: 20110204291Abstract: A luminescent material is disclosed. The luminescent material may include a first compound having a host lattice comprising first ions and oxygen. A first portion of the first ions may be substituted by copper ions. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and the first compound may have an Olivine crystal structure, ?-K.2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the ultraviolet or visible light.Type: ApplicationFiled: May 3, 2011Publication date: August 25, 2011Applicant: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Gundula ROTH, Walter TEWS, Chung Hoon LEE
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Publication number: 20110147662Abstract: Exemplary embodiments of the present invention relate to inorganic phosphors based on silicate compounds having improved stability under a resulting radiation load and resistance to atmospheric humidity, which are capable of converting higher-energy excitation radiation, i.e. ultraviolet (UV) or blue light, with high efficiency into a longer-wavelength radiation which may be in the visible spectral range. A calcium molar fraction x having a value between 0 and 0.05 is added to a silicate phosphor having the general formula Sr3-x-y-zCaxMIIySiO5:Euz.Type: ApplicationFiled: September 10, 2010Publication date: June 23, 2011Applicants: SEOUL SEMICONDUCTOR CO., LTD., LITEC-LP GMBHInventors: Chung Hoon LEE, Walter TEWS, Gundula ROTH, Detlef STARICK
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Publication number: 20110101275Abstract: This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and/or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate/or germanate-silicate type, and/or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and/or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and/or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.Type: ApplicationFiled: January 11, 2011Publication date: May 5, 2011Applicants: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Gundula ROTH, Walter TEWS, Chung Hoon LEE
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Patent number: 7928466Abstract: A light-emitting semi-conductor diode comprising a light emitting chip at least partially surrounded by a transparent electronics protecting body on which a composite layer foil is disposed, the composite layer foil includes at its side facing away from the electronics protection body a carrier layer, which has a refraction index that is greater than the refraction index of the electronics protection body and, at the opposite side, an active layer of the same material of which the electronics protecting body consists.Type: GrantFiled: January 18, 2008Date of Patent: April 19, 2011Assignee: Merck Patent GmbHInventors: Hermann Oppermann, Julius Muschaweck, Jochen Kunze, Thomas Luce, Eike Krochmann, Walter Tews, Gundula Roth
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Publication number: 20110050090Abstract: A light emitting device having oxyorthosilicate luminophores is disclosed. The light emitting device includes a light emitting diode and luminescent substances disposed around the light emitting diode, to adsorb at least a portion of light emitted from the light emitting diode and emitting light having different wavelength from that of the absorbed light. The luminescent substances have Eu2+-doped silicate luminophores in which solid solutions in the form of mixed phases between alkaline earth metal oxyorthosilicates and rare earth metal oxyorthosilicates are used as base lattices for the Eu2+ activation leading to luminescence. The luminescent substances are used as radiation converters to convert a higher-energy primary radiation, for example, ultra violet (UV) radiation or blue light, into a longer-wave visible radiation and are therefore preferably employed in corresponding light-emitting devices.Type: ApplicationFiled: April 26, 2010Publication date: March 3, 2011Applicant: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon LEE, Walter Tews, Gundula Roth, Detlef Starick
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Publication number: 20110025187Abstract: The invention relates to a low-pressure gas-discharge lamp which, with its light in the red spectral region, influences the biological circadian rhythm by controlling melatonin secretion. The tubular glass discharge vessel, which can also be in the shape of a double helix, is filled with a noble gas or noble-gas mixture and mercury. Electrodes for the supply of energy are arranged at both ends of the discharge vessel. The discharge vessel is multicoated on the inside by phosphor layers applied one after the other. The first phosphor layer located on the glass surface consists of phosphor which is excited both by ultraviolet mercury radiation between 180 nm and 400 nm and also by the blue radiation between 400 nm and 490 nm emitted by the mercury discharge, and by the visible radiation emitted by the second or further phosphor layers between 400 nm and 550 nm, where visible light having emission maxima in the region between 500 nm and 650 nm is generated.Type: ApplicationFiled: March 13, 2009Publication date: February 3, 2011Applicants: MERCK PATENT GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, NARVA LICHTQUEQUELLEN GMBH + CO. KGInventors: Walter Tews, Gundula Roth, Juergen Meltke, Hans Juergen Walther
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Publication number: 20100327229Abstract: Exemplary embodiments of the present invention disclose inorganic luminescent substances with Eu2+-doped silicate luminophores, in which solid solutions in the form of mixed phases between alkaline earth metal oxyorthosilicates and rare earth metal oxyorthosilicates are used as base lattices for the Eu2+ activation leading to the luminescence. These luminophores are described by the general formula (1-x) MII3SiO5.xSE2SiO5:Eu, in which MII preferably represents strontium ion or another alkaline earth metal ion, or another divalent metal ion selected from the group consisting of the magnesium, calcium, barium, copper, zinc, and manganese. These ions may be used in addition to strontium and also as mixtures with one another.Type: ApplicationFiled: May 4, 2010Publication date: December 30, 2010Applicants: Seoul Semiconductor Co., Ltd., LITEC-LP GmbHInventors: Chung Hoon LEE, Walter Tews, Gundula Roth, Detlef Starick
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Publication number: 20100301371Abstract: 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: ApplicationFiled: August 10, 2010Publication date: December 2, 2010Applicant: Seoul Semiconductor Co., Ltd.Inventors: Gundula ROTH, Walter Tews, Chung-Hoon Lee
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Patent number: 7828993Abstract: A phosphor for converting ultraviolet light or blue light emitted from a light emitting element into a visible white radiation having a high level of color rendering properties, containing a light emitting component prepared from a solid system of an alkaline earth metal antimonate and a system derived from the solid system and exhibiting intrinsic photoemission, such as a fluoroantimonate, a light emitting component prepared from a manganese(IV)-activated antimonate, a titanate, silicate-germanate, and an aluminate, a light emitting component prepared from a europium-activated silicate-germanate or from a system containing a sensitizer selected from a group consisting of europium (II) and manganese (II) as a secondary activator and having an orange color or a dark red color in the spectrum range over 600 nm, or a light emitting component composed of a mixture of eight or less light emitting components having different emission bands and brought to a state of continuous emission of about 380 to 780 nm exhibitType: GrantFiled: December 19, 2003Date of Patent: November 9, 2010Assignees: Tovoda Gosei Co.. Ltd., Gundula Roth, Walter TewsInventors: Gundula Roth, Walter Tews
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Publication number: 20100230691Abstract: A ferrous-metal-alkaline-earth-metal mixed silicate based phosphor is used in form of a single component or a mixture as a light converter for a primarily visible and/or ultraviolet light emitting device. The phosphor has a rare earth element as an activator. The rare earth element is europium (Eu). Alternatively, the phosphor may have a coactivator formed of a rare earth element and at least one of Mn, Bi, Sn, and Sb.Type: ApplicationFiled: March 26, 2007Publication date: September 16, 2010Inventors: Mitsuhiro Inoue, Akio Namiki, Makoto Ishida, Takashi Nonogawa, Koichi Ota, Atsuo Hirano, Walter Tews, Gundula Roth, Stefan Tews
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Publication number: 20100207132Abstract: Disclosed is a light emitting device employing non-stoichiometric tetragonal Alkaline Earth Silicate phosphors. The light emitting device comprises a light emitting diode emitting light of ultraviolet or visible light, and non-stoichiometric luminescent material disposed around the light emitting diode. The luminescent material adsorbs at least a portion of the light emitted from the light emitting diode and emits light having a different wavelength from the absorbed light. The non-stoichiometric luminescent material has tetragonal crystal structure, and contains more silicon in the crystal lattice than that in the crystal lattice of silicate phosphors having stoichiometric crystal structure. The luminescent material is represented as the formula (BauSrvCawCux)3?y(Zn,Mg,Mn)zSi1+bO5+2b:Euu. Light emitting devices having improved temperature and humidity stability can be provided by employing the non-stoichiometric tetragonal Alkaline Earth Silicate phosphors.Type: ApplicationFiled: August 14, 2008Publication date: August 19, 2010Applicant: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan Tews
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Publication number: 20100201250Abstract: The invention relates to a process for the preparation of phosphors of the formula I BawSrxCaySiO4:zEu2+??(I) where w+x+y+z=2 and 0.005?z?0.5, and to an illumination unit and to the use of the phosphor as LED conversion phosphor for white LEDs or so-called colour-on-demand applications.Type: ApplicationFiled: March 5, 2008Publication date: August 12, 2010Inventors: Holger Winkler, Tim Vosgroene, Gundula Roth, Walter Tews, Stefan Tews
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Publication number: 20100194263Abstract: The invention relates to a process for the preparation of phosphors of the formula I BawSrxCaySiO4:zEu2+??(I) where w+x+y+z=2 and 0.005?z?0.3, and to an illumination unit and to the use of the phosphor as LED conversion phosphor for white LEDs or so-called colour-on-demand applications.Type: ApplicationFiled: March 5, 2008Publication date: August 5, 2010Inventors: Holger Winkler, Tim Vosgroene, Gundula Roth, Walter Tews, Stefan Tews
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Publication number: 20100176342Abstract: This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and/or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate/or germanate-silicate type, and/or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and/or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and/or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.Type: ApplicationFiled: March 25, 2010Publication date: July 15, 2010Applicant: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Gundula ROTH, Walter Tews, Chung Hoon Lee
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Publication number: 20100165645Abstract: A light emitting device is disclosed. The light emitting device may include a light emitting diode (LED) for emitting light and phosphor adjacent to the LED. The phosphor may be excitable by light emitted by the LED and may include a first compound having a host lattice comprising first ions and oxygen. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and first compound may have an Olivin crystal structure, a ?-K2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the light emitted by the LED.Type: ApplicationFiled: June 25, 2009Publication date: July 1, 2010Applicant: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon Lee, Gundula ROTH, Walter Tews
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Publication number: 20100155761Abstract: A light emitting device includes a light emitting element comprising a nitride semiconductor and a phosphor that can absorb a part of light emitted from the light emitting element and can emit light of a wavelength different from that of the absorbed light. The phosphor comprises a silicate phosphor comprising three alkali earth metals.Type: ApplicationFiled: February 23, 2010Publication date: June 24, 2010Applicants: Toyoda Gosei Co., Ltd., Tridonic Optoelectronics GMBH, Litec GBR, Leuchstoff Breitungen GMBHInventors: Koichi Ota, Atsuo Hirano, Akihito Ota, Stefan Tasch, Peter Pachler, Gundula Roth, Walter Tews, Wofgang Kempfert, Detlef Starick
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Patent number: 7679101Abstract: The light emitting device has a light emitting diode which is made of a nitride semiconductor and a phosphor which absorbs a part of lights emitted from the light emitting diode and emits different lights with wavelengths other than those of the absorbed lights. The phosphor is made of alkaline earth metal silicate fluorescent material activated with europium.Type: GrantFiled: November 30, 2006Date of Patent: March 16, 2010Assignees: Toyoda Gosei Co., Ltd., Tridonic Optoelectronics GmbH, Litec GBR, Leuchstoffwerk Breitungen GmbHInventors: Koichi Ota, Atsuo Hirano, Akihito Ota, Stefan Tasch, Peter Pachler, Gundula Roth, Walter Tews, Wolfgang Kempfert, Detlef Starick
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Publication number: 20100002454Abstract: A light emitting device is disclosed. The light emitting device may include a light emitting diode (LED) for emitting light and phosphor adjacent to the LED. The phosphor may be excitable by light emitted by the LED and may include a first compound having a host lattice comprising first ions and oxygen. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and first compound may have an Olivin crystal structure, a ?-K2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the light emitted by the LED.Type: ApplicationFiled: June 25, 2009Publication date: January 7, 2010Applicant: Seoul Semiconductor Co., Ltd.Inventors: Chung-Hoon Lee, Gundula ROTH, Walter Tews