Patents by Inventor Stefan Tews
Stefan Tews 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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Publication number: 20230279292Abstract: A compound of the general formula A2N1-xMxO2xX6-2x doped with Mn(IV), in which A is selected from the group consisting of Li, Na, K, Rb, Cs, Cu, Ag, Ti, NH4 or a combination thereof, N is selected from the group consisting of Si, Ge, Sn, Ti, Pb, Ce, Zr, Ru, Ir, Pr and/or Hf or a combination thereof, M is selected from the group consisting of W, Cr, Mo, Te and/or Re or a combination thereof, X is selected from the group consisting of F, Cl, Br, I or a combination thereof, and 0<x?1.Type: ApplicationFiled: March 3, 2023Publication date: September 7, 2023Inventors: Bo Yong HAN, Stefan Tews, Mathias Rapphahn, Benjamin Kistner
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Publication number: 20230083851Abstract: A compound of the general formula (I): A3BF2M1?xTxO2?2xF4+2x doped with Mn(IV), in which A is selected from the group consisting of Li, Na, K, Rb, Cs, Cu, Ag, Tl, NH4, NR4 and mixtures of two or more thereof, where R is an alkyl or aryl group, B is selected from the group consisting of H and D and mixtures thereof, where D is Deuterium, M is selected from the group consisting of Cr, Mo, W, Te, Re and mixtures of two or more thereof, T is selected from the group consisting of Si, Ge, Sn, Ti, Pb, Ce, Zr, Hf and mixtures of two or more thereof, and 0?x?1.Type: ApplicationFiled: August 18, 2022Publication date: March 16, 2023Inventors: Thomas Jansen, Ho Jun Byun, Inbeom Song, Bo Yong Hann, Benjamin Kistner, Stefan Tews
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Patent number: 10745616Abstract: The present invention relates to alkaline earth aluminate phosphors, to a process for the preparation thereof and to the use thereof as conversion phosphors. The present invention also relates to an emission-converting material comprising at least the conversion phosphor according to the invention, and to the use thereof in light sources, in particular pc-LEDs (phosphor converted light emitting devices). The present invention furthermore relates to light sources, in particular pc-LEDs, and to lighting units which comprise a primary light source and the emission-converting material according to the invention.Type: GrantFiled: March 2, 2016Date of Patent: August 18, 2020Assignee: MERCK PATENT GMBHInventors: Aleksander Zych, Mathias Rapphahn, Ralf Petry, Ingo Koehler, Andreas Benker, Stefan Tews
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Patent number: 10689570Abstract: The invention relates to pyrosilicate phosphors comprising a coating of aluminum oxide, to a process for the preparation of these compounds, and to the use thereof as conversion phosphors or in lamps.Type: GrantFiled: March 30, 2016Date of Patent: June 23, 2020Assignee: Merck Patent GmbHInventors: Aleksander Zych, Ralf Petry, Mathias Rapphahn, Ingo Koehler, Stefan Tews
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Patent number: 10557081Abstract: The present invention relates to light-converting materials which comprise semiconductor nanoparticles and an unactivated crystalline material, where the semiconductor nanoparticles are located on the surface of the unactivated crystalline material. The present invention furthermore relates to the use of the light-converting material in a light source. The present invention furthermore relates to a light-converting mixture, to a light source, to a lighting unit which contains the light-converting material according to the invention, and to a process for the production of the light source.Type: GrantFiled: August 17, 2016Date of Patent: February 11, 2020Assignee: Merck Patent GmbHInventors: Norbert Stenzel, Andrea Opolka, Bernhard Rieger, Stefan Tews
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Publication number: 20190085239Abstract: The present invention relates to light-converting materials which comprise semiconductor nanoparticles and an unactivated crystalline material, where the semiconductor nanoparticles are located on the surface of the unactivated crystalline material. The present invention furthermore relates to the use of the light-converting material in a light source. The present invention furthermore relates to a light-converting mixture, to a light source, to a lighting unit which contains the light-converting material according to the invention, and to a process for the production of the light source.Type: ApplicationFiled: August 17, 2016Publication date: March 21, 2019Applicant: Merck Patent GmbHInventors: Norbert STENZEL, Andrea OPOLKA, Bernhard RIEGER, Stefan TEWS
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Patent number: 10125315Abstract: The present invention relates to pyrosilicate phosphors, to a process for the preparation thereof and to the use thereof as conversion phosphors. The present invention also relates to an emission-converting material comprising the conversion phosphor according to the invention, and to the use thereof in light sources, in particular pc-LEDs (phosphor converted light emitting devices). The present invention furthermore relates to light sources, in particular pc-LEDs, and to lighting units which comprise a primary light source and the emission-converting material according to the invention.Type: GrantFiled: March 30, 2016Date of Patent: November 13, 2018Assignee: Merck Patent GmbHInventors: Aleksander Zych, Ralf Petry, Mathias Rapphahn, Ingo Koehler, Stefan Tews
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Publication number: 20180298280Abstract: The invention relates to pyrosilicate phosphors comprising a coating of aluminum oxide, to a process for the preparation of these compounds, and to the use thereof as conversion phosphors or in lamps.Type: ApplicationFiled: March 30, 2016Publication date: October 18, 2018Applicant: Merck Patent GmbHInventors: Aleksander ZYCH, Ralf PETRY, Mathias RAPPHAHN, Ingo KOEHLER, Stefan TEWS
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Publication number: 20180155621Abstract: The present invention relates to pyrosilicate phosphors, to a process for the preparation thereof and to the use thereof as conversion phosphors. The present invention also relates to an emission-converting material comprising the conversion phosphor according to the invention, and to the use thereof in light sources, in particular pc-LEDs (phosphor converted light emitting devices). The present invention furthermore relates to light sources, in particular pc-LEDs, and to lighting units which comprise a primary light source and the emission-converting material according to the invention.Type: ApplicationFiled: March 30, 2016Publication date: June 7, 2018Applicant: Merck Patent GmbHInventors: Aleksander ZYCH, Ralf PETRY, Mathias RAPPHAHN, Ingo KOEHLER, Stefan TEWS
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Publication number: 20180066186Abstract: The present invention relates to alkaline earth aluminate phosphors, to a process for the preparation thereof and to the use thereof as conversion phosphors. The present invention also relates to an emission-converting material comprising at least the conversion phosphor according to the invention, and to the use thereof in light sources, in particular pc-LEDs (phosphor converted light emitting devices). The present invention furthermore relates to light sources, in particular pc-LEDs, and to lighting units which comprise a primary light source and the emission-converting material according to the invention.Type: ApplicationFiled: March 2, 2016Publication date: March 8, 2018Applicant: MERCK PATENT GMBHInventors: Aleksander ZYCH, Mathias RAPPHAHN, Ralf PETRY, Ingo KOEHLER, Andreas BENKER, Stefan TEWS
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Publication number: 20160264862Abstract: The invention relates to europium-doped silicate phosphors comprising a coating of aluminum oxide, to a process for the preparation of these compounds, and to the use thereof as conversion phosphors or in lamps.Type: ApplicationFiled: October 2, 2014Publication date: September 15, 2016Applicant: MERCK PATENT GMBHInventors: Holger WINKLER, Monica DAVIS, Christof HAMPEL, Andrea OPOLKA, Ralf PETRY, Olaf SOETH, Stefan TEWS, Christopher GUMP, David KING, Joseph A. SPENCER, Kassandra SULLIVAN-TRUJILLO
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Patent number: 9157025Abstract: The invention relates to novel phosphor mixtures comprising three or more silicate phosphors. The invention furthermore relates to the use of these mixtures in electronic and electro-optical devices, in particular in light-emitting diodes (LEDs) for backlighting applications. The invention furthermore relates to LEDs comprising the phosphors.Type: GrantFiled: September 10, 2010Date of Patent: October 13, 2015Assignee: MERCK PATENT GMBHInventors: Holger Winkler, Andreas Benker, Martina Hueber, Monika Kursawe, Ralf Petry, Stefan Tews, Tim Vosgroene
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Patent number: 8501040Abstract: Disclosed are non-stoichiometric Copper Alkaline Earth Silicate phosp hors activated by divalent europium for using them as high temperature stable luminescent mat erials for ultraviolet or daylight excitation. The phosphors are represented as the formula (BauSryCawCux)3?y(Zn,Mg,Mn)zSi1+bO5+2b:Eua. The non-stoichiometric tetragonal silicat e is prepared in a high temperature solid state reaction with a surplus of silica in the starting mixture. Furthermore, luminescent tetragonal Copper Alkaline Earth Silicates are provided for LED applications, which have a high color temperature range from about 2,000K to 8,000K or 10,000 K showing a CRI with Ra=80˜95, when mixed with other luminescent materials.Type: GrantFiled: January 31, 2012Date of Patent: August 6, 2013Assignee: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan Tews
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Patent number: 8431954Abstract: 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:Eua. Light emitting devices having improved temperature and humidity stability can be provided by employing the non-stoichiometric tetragonal Alkaline Earth Silicate phosphors.Type: GrantFiled: January 31, 2012Date of Patent: April 30, 2013Assignee: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan Tews
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Publication number: 20120199865Abstract: The invention relates to novel phosphor mixtures comprising three or more silicate phosphors. The invention furthermore relates to the use of these mixtures in electronic and electro-optical devices, in particular in light-emitting diodes (LEDs) for backlighting applications. The invention furthermore relates to LEDs comprising the phosphors.Type: ApplicationFiled: September 10, 2010Publication date: August 9, 2012Applicant: MERCK PATENT GESELLSCHAFT MIT BESCHRANKTER HAFTUNGInventors: Holger Winkler, Andreas Benker, Martina Hueber, Monika Kursawe, Ralf Petry, Stefan Tews, Tim Vosgroene
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Publication number: 20120132939Abstract: 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:Eua. Light emitting devices having improved temperature and humidity stability can be provided by employing the non-stoichiometric tetragonal Alkaline Earth Silicate phosphors.Type: ApplicationFiled: January 31, 2012Publication date: May 31, 2012Applicant: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Chung Hoon LEE, Walter TEWS, Gundula ROTH, Stefan TEWS
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Publication number: 20120126174Abstract: Disclosed are non stoichiometric Copper Alkaline Earth Silicate phosphors activated by divalent europium for using them as high temperature stable luminescent materials for ultraviolet or daylight excitation. The phosphors are represented as the formula (BauSryCawCux)3?y(Zn,Mg,Mn)zSi1+bO5+2b:Eua. The nonstoichiometric tetragonal silicate is prepared in a high temperature solid state reaction with a surplus of silica in the starting mixture. Furthermore, luminescent tetragonal Copper Alkaline Earth Silicates are provided for LED applications, which have a high color temperature range from about 2,000K to 8,000K or 10,000K showing a CRI with Ra=80˜95, when mixed with other luminescent materials.Type: ApplicationFiled: January 31, 2012Publication date: May 24, 2012Applicant: SEOUL SEMICONDUCTOR CO., LTD.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan Tews
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Patent number: 8137589Abstract: Disclosed are non stoichiometric Copper Alkaline Earth Silicate phosphors activated by divalent europium for using them as high temperature stable luminescent materials for ultraviolet or daylight excitation. The phosphors are represented as the formula (BauSrvCawCux)3?y(Zn,Mg,Mn)zSi1+bO5+2b:Eua. The nonstoichiometric tetragonal silicate is prepared in a high temperature solid state reaction with a surplus of silica in the starting mixture. Furthermore, luminescent tetragonal Copper Alkaline Earth Silicates are provided for LED applications, which have a high color temperature range from about 2,000K to 8,000K or 10,000K showing a CRI with Ra=80˜95, when mixed with other luminescent materials.Type: GrantFiled: August 22, 2008Date of Patent: March 20, 2012Assignee: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan Tews
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Patent number: 8134165Abstract: 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:Eua. Light emitting devices having improved temperature and humidity stability can be provided by employing the non-stoichiometric tetragonal Alkaline Earth Silicate phosphors.Type: GrantFiled: August 14, 2008Date of Patent: March 13, 2012Assignee: Seoul Semiconductor Co., Ltd.Inventors: Chung Hoon Lee, Walter Tews, Gundula Roth, Stefan 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