Patents by Inventor Charles L. Melcher

Charles L. Melcher 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).

  • Publication number: 20190250286
    Abstract: Codoped alkali and alkaline earth halide scintillators are described. More particularly, the scintillators are codoped with tetravalent ions, such as Ti4+, Zr4+, Hf4+, Ge4+. The codoping can alter one or more optical and/or scintillation property of the scintillator material. For example, the codoping can improve energy resolution. Radiation detectors comprising the scintillators and methods of detecting high energy radiation using the radiation detectors are also described.
    Type: Application
    Filed: February 13, 2019
    Publication date: August 15, 2019
    Inventors: Yuntao Wu, Charles L. Melcher
  • Patent number: 10377945
    Abstract: Mixed halide scintillation materials of the general formula AB(1-y)MyX?wX?(3-w), where 0?y?1, 0.05?w?1, A may be an alkali metal, B may be an alkali earth metal, and X? and X? may be two different halogen atoms, and of the general formula A(1-y)BMyX?wX?(3-w), where 0?y?1, 0.05?w?1, A maybe an alkali metal, B may be an alkali earth metal, and X? and X? are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu2+ or Yb2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl+, Na+ and In+.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: August 13, 2019
    Assignee: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION
    Inventors: Luis Stand, Charles L. Melcher, Mariya Zhuravleva, Hua Wei
  • Patent number: 10351768
    Abstract: Mixed halide scintillation materials of a first general formula A4B(1-y)MyX?6(1-z)X?6z and a second general formula A(4-y)BMyX?6(1-z)X?6z are disclosed. In the general formulas, A is an alkali metal, B is an alkaline earth metal, and X? and X? are two different halogen atoms. Scintillation materials of the first general formula include a divalent external activator M such as Eu2+ or Yb2+ or a trivalent external activator M such as Ce3+. Scintillation materials of the second general formula include a monovalent external activator M such as In+, Na+, or Tl+ or a trivalent external activator such as Ce3+.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: July 16, 2019
    Assignee: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION
    Inventors: Luis Stand, Mariya Zhuravleva, Kan Yang, Charles L. Melcher, Adam Coleman Lindsey
  • Patent number: 10221355
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include Tl and/or In-based ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; X is a halide, such as Cl, Br, I, F or any combination thereof; some or all of A has been replaced by Tl and/or In, and some or all of B has been replaced by another dopant, such as Eu, Ce, Tb, Yb, and Pr. Radiation detectors comprising the metal halide scintillators are also described.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: March 5, 2019
    Assignee: University of Tennessee Research Foundation
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Publication number: 20180321393
    Abstract: Metal halide optical materials (e.g., scintillator materials or persistent phosphors) are described. More particularly, the optical materials include codoped perovskite-type halides, wherein the codoping ion is present at a molar ratio of 5000 parts per million (ppm) or less with respect to all cations. For example, the optical material can be a codoped trihalide having the formula ABX3 where A is one or more alkali metal, B is one or more alkali earth metal, and X is one or more halide that is doped with up to about 10 atomic percent of a dopant ion and codoped with up to about 5000 ppm of one or more isovalent or aliovalent codopant ion, such as a tetravalent ion (e.g., Zr4+), a trivalent ion (e.g., Sc3+, Y3+, Gd3+, or La3+ ion) or a divalent ion (e.g., Mg2+). The codoped material can have modified afterglow compared to a noncodoped material.
    Type: Application
    Filed: May 3, 2018
    Publication date: November 8, 2018
    Inventors: Yuntao Wu, Mariya Zhuravleva, Luis Stand, Charles L. Melcher
  • Publication number: 20180155620
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include Tl and/or In-based ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; X is a halide, such as Cl, Br, I, F or any combination thereof; some or all of A has been replaced by Tl and/or In, and some or all of B has been replaced by another dopant, such as Eu, Ce, Tb, Yb, and Pr. Radiation detectors comprising the metal halide scintillators are also described.
    Type: Application
    Filed: January 10, 2018
    Publication date: June 7, 2018
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Publication number: 20180105745
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include doped (e.g., europium-doped) ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; and X is a halide, such as Cl, Br, I, F or any combination thereof. Radiation detectors comprising the novel metal halide scintillators and other ternary metal halides, such as those of the formulas A2EuX4 and AEu2X5, wherein A is an alkali metal and X is a halide, are also described.
    Type: Application
    Filed: June 27, 2017
    Publication date: April 19, 2018
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Publication number: 20170218265
    Abstract: Mixed halide scintillation materials of a first general formula A4B(1-y)MyX?6(1-z)X?6z and a second general formula A(4-y)BMyX?6(1-z)X?6z are disclosed. In the general formulas, A is an alkali metal, B is an alkali earth metal, and X? and X? are two different halogen atoms. Scintillation materials of the first general formula include a divalent external activator M such as Eu2+ or Yb2+ or a trivalent external activator M such as Ce3+. Scintillation materials of the second general formula include a monovalent external activator M such as In+, Na+, or Tl+ or a trivalent external activator such as Ce3+.
    Type: Application
    Filed: November 15, 2016
    Publication date: August 3, 2017
    Inventors: Luis Stand, Mariya Zhuravleva, Kan Yang, Charles L. Melcher, Adam Coleman Lindsey
  • Publication number: 20170219719
    Abstract: A radiation detection system may include a detector. The detector may include a scintillator to convert ionizing radiation, which originates externally to the detector, into visible light, a sensor configured to detect the visible light from the scintillator, and a light source. The radiation detection system may further include a controller programmed to control the light source to expose the scintillator to a light to saturate traps in the scintillator.
    Type: Application
    Filed: April 21, 2017
    Publication date: August 3, 2017
    Inventors: Charles L. Melcher, Mohit Tyagi, Merry Koschan, Peter Carl Cohen, Matthias Schmand, Mark S. Andreaco, Lars Aldon Eriksson
  • Publication number: 20170190969
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include doped (e.g., europium-doped) ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; and X is a halide, such as Cl, Br, I, F or any combination thereof. Radiation detectors comprising the novel metal halide scintillators and other ternary metal halides, such as those of the formulas A2EuX4 and AEu2X5, wherein A is an alkali metal and X is a halide, are also described.
    Type: Application
    Filed: March 17, 2017
    Publication date: July 6, 2017
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Patent number: 9695356
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include doped (e.g., europium-doped) ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; and X is a halide, such as Cl, Br, I, F or any combination thereof. Radiation detectors comprising the novel metal halide scintillators and other ternary metal halides, such as those of the formulas A2EuX4 and AEu2X5, wherein A is an alkali metal and X is a halide, are also described.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: July 4, 2017
    Assignee: University of Tennessee Research Foundation
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Patent number: 9664799
    Abstract: A radiation detector may include a scintillator, a light source, and a sensor. The scintillator may include various scintillation materials capable of converting non-visible radiation (incoming radiation) into visible light. The sensor may be placed in adjacent or in close proximity to the scintillator, such that any converted visible light may be detected or measured by the sensor. The light source may be placed in adjacent or in close proximity to the scintillator, such that light from the light source may interact with defects in the scintillator to minimize interference on the conversion of non-visible radiation into visible light caused by the defects.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: May 30, 2017
    Assignees: University of Tennessee Research Foundation, Siemens Molecular Imaging
    Inventors: Charles L. Melcher, Mohit Tyagi, Merry Koschan, Peter Carl Cohen, Matthias Schmand, Mark S. Andreaco, Lars Aldon Eriksson
  • Patent number: 9664800
    Abstract: A scintillator element is disclosed where the scintillator element includes a scintillator formed of a scintillation material capable of converting non-visible radiation into scintillation light, wherein the scintillator has a plurality of laser-etched micro-voids within the scintillator, each micro-void having an interior surface, and an intrinsic reflective layer is formed on the interior surface of at least some of the micro-voids, wherein the intrinsic reflective layer is formed from the scintillation material.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: May 30, 2017
    Assignees: University of Tennessee Research Foundation, Siemens Medical Solutions USA, Inc.
    Inventors: Mark S. Andreaco, Peter Carl Cohen, Matthias J. Schmand, James L. Corbeil, Alexander Andrew Carey, Robert A. Mintzer, Charles L. Melcher, Merry A. Koschan
  • Patent number: 9624429
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include doped (e.g., europium-doped) ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; and X is a halide, such as Cl, Br, I, F or any combination thereof. Radiation detectors comprising the novel metal halide scintillators and other ternary metal halides, such as those of the formulas A2EuX4 and AEu2X5, wherein A is an alkali metal and X is a halide, are also described.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: April 18, 2017
    Assignee: University of Tennessee Research Foundation
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Publication number: 20170058196
    Abstract: Mixed halide scintillation materials of the general formula AB(1-y)MyX?wX?(3-w), where 0?y?1, 0.05?w?1, A may be an alkali metal, B may be an alkali earth metal, and X? and X? may be two different halogen atoms, and of the general formula A(1-y)BMyX?wX?(3-w), where 0?y?1, 0.05?w?1, A maybe an alkali metal, B may be an alkali earth metal, and X? and X? are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu2+ or Yb2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl+, Na+ and In+.
    Type: Application
    Filed: May 8, 2015
    Publication date: March 2, 2017
    Inventors: Luis Stand, Charles L. Melcher, Mariya Zhuravleva, Hua Wei
  • Publication number: 20160168458
    Abstract: Metal halide scintillators are described. More particularly, the scintillators include doped (e.g., europium-doped) ternary metal halides, such as those of the formulas A2BX4 and AB2X5, wherein A is an alkali metal, such as Li, Na, K, Rb, Cs or any combination thereof; B is an alkali earth metal, such as Be, Mg, Ca, Sr, Ba or any combination thereof; and X is a halide, such as Cl, Br, I, F or any combination thereof. Radiation detectors comprising the novel metal halide scintillators and other ternary metal halides, such as those of the formulas A2EuX4 and AEu2X5, wherein A is an alkali metal and X is a halide, are also described.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 16, 2016
    Applicant: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION
    Inventors: Luis Stand, Mariya Zhuravleva, Charles L. Melcher
  • Publication number: 20160170043
    Abstract: A scintillator element is disclosed where the scintillator element includes a scintillator formed of a scintillation material capable of converting non-visible radiation into scintillation light, wherein the scintillator has a plurality of laser-etched micro-voids within the scintillator, each micro-void having an interior surface, and an intrinsic reflective layer is formed on the interior surface of at least some of the micro-voids, wherein the intrinsic reflective layer is formed from the scintillation material.
    Type: Application
    Filed: February 19, 2016
    Publication date: June 16, 2016
    Inventors: Mark S. Andreaco, Peter Carl Cohen, Matthias J. Schmand, James L. Corbeil, Alexander Andrew Carey, Robert A. Mintzer, Charles L. Melcher, Merry A. Koschan
  • Publication number: 20160124094
    Abstract: A radiation detector may include a scintillator, a light source, and a sensor. The scintillator may include various scintillation materials capable of converting non-visible radiation (incoming radiation) into visible light. The sensor may be placed in adjacent or in close proximity to the scintillator, such that any converted visible light may be detected or measured by the sensor. The light source may be placed in adjacent or in close proximity to the scintillator, such that light from the light source may interact with defects in the scintillator to minimize interference on the conversion of non-visible radiation into visible light caused by the defects.
    Type: Application
    Filed: June 12, 2014
    Publication date: May 5, 2016
    Inventors: Charles L. Melcher, Mohit Tyagi, Merry Koschan, Peter Carl Cohen, Matthias Schmand, Mark S. Andreaco, Lars Aldon Eriksson
  • Publication number: 20150353822
    Abstract: A method of tailoring the properties of garnet-type scintillators to meet the particular needs of different applications is described. More particularly, codoping scintillators, such as Gd3Ga3AI2012, Gd3Ga2AI3012, or other rare earth gallium aluminum garnets, with different ions can modify the scintillation light yield, decay time, rise time, energy resolution, proportionality, and/or sensitivity to light exposure. Also provided are the codoped garnet-type scintillators themselves, radiation detectors and related devices comprising the codoped garnet-type scintillators, and methods of using the radiation detectors to detect gamma rays, X-rays, cosmic rays, and particles having an energy of 1 keV or greater.
    Type: Application
    Filed: January 23, 2014
    Publication date: December 10, 2015
    Inventors: Mohit Tyagi, Merry Koschan, Charles L. Melcher, Samuel Bradley Donnald
  • Patent number: 8912498
    Abstract: A halide scintillator material is disclosed. The material is single-crystalline and has a composition of the formula A3MBr6(1-x)Cl6x (such as Cs3CeBr6(1-x)Cl6x) or AM2Br7(1-x)Cl7x (such as CsCe2Br7(1-x)Cl7x), 0?x?1, wherein A consists essentially of Li, Na K, Rb, Cs or any combination thereof, and M consists essentially of Ce, Sc, Y, La, Lu, Gd, Pr, Tb, Yb, Nd or any combination thereof. Furthermore, a method of making halide scintillator materials of the above-mentioned compositions is disclosed. In one example, high-purity starting halides (such as CsBr, CeBr3, CsCl and CeCl3) are mixed and melted to synthesize a compound of the desired composition of the scintillator material. A single crystal of the scintillator material is then grown from the synthesized compound by the Bridgman method. The disclosed scintillator materials are suitable for making scintillation detectors used in applications such as medical imaging and homeland security.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: December 16, 2014
    Assignees: University of Tennessee Research Foundation, Siemens Medical Solutions USA, Inc.
    Inventors: Kan Yang, Mariya Zhuravleva, Charles L. Melcher, Piotr Szupryczynski