General Electric Company

Current Lighting Solutions, LLC

Baker Hughes Oilfield Operations LLC

Ge Lighting Solutions LLC

Prasanth Kumar Nammalwar

Anant Achyut Setlur

James Edward Murphy

Digamber Gurudas Porob

Robert Joseph Lyons

Florencio Garcia

Alok Mani Srivastava

Ashfaqul Islam Chowdhury

Nagaveni Karkada

Gopi Chandran Ramachandran

Holly Ann Comanzo

William Winder Beers

Satya Kishore Manepalli

Srinidhi Ramachandra

Matthew David Butts

Timothy John Sommerer

Emil Vergilov Radkov

Sergei Ivanovich Dolinsky

Fangming Du

Ravikumar Hanumantha

Oltea Puica Siclovan

Karthick Vilapakkam Gourishankar

Helene Claire Climent

Wusheng Xu

Claire Susan Henderson

Madras Venugopal Shankar

Suchismita Sanyal

Linda Jane Valyou Briel

Ramachandran Gopi Chandran

William Jordan Heward

Ramesh Rao Sathyanarayan

Anant Achyut Setler

Mattews David Butts

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mndoped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm, a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.

Color stable red-emitting phosphors

A process for coating a phosphor of formula I: A[MF]:Mnincludes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: A[MF] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus () including the population of particles are also presented.

Coated red line emitting phosphors

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mndoped phosphor, wherein the lighting apparatus has a color shift of &#x2264;1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm, a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25&#xb0; C.

A process for synthesizing a manganese doped phosphor of formula I: A[MF]:Mnis presented. The process includes contacting a first solution with a second solution and a third solution in the presence of a plurality of inert particles. The first solution and the second solution include a composition of formula II: A[MnF]. The third solution includes a source of M, where A is Li, Na, K, Rb, Cs, or combinations thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or combinations thereof; x is an absolute value of a charge of the [MF] ion; and y is 5, 6 or 7.

Processes for synthesizing red-emitting phosphors and related red-emitting phosphors

A process for synthesizing a Mndoped phosphor of formula I by electrolysis is presented. The process includes electrolyzing a reaction solution comprising a source of manganese, a source of M and a source of A. One aspect relates to a phosphor composition produced by the process. A lighting apparatus including the phosphor composition is also provided. A[MF]:Mn(I) where, A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF] ion; and y is 5, 6 or 7.

Red-emitting phosphors, processes and devices

A method and an apparatus for detecting photons are disclosed. The apparatus includes a scintillator single crystal and an avalanche photodiode coupled to the scintillator single crystal. The scintillator single crystal is at a temperature greater than about 175&#xb0; C. and at a shock level in a range from about 20 Grms to about 30 Grms. The scintillator single crystal includes a praseodymium doped composition selected from (LaY)2SiO:Pr, ABClX:Pr, A(Li,Na)LaClX:Pr, or any combinations thereof. As used herein A is cesium, rubidium, potassium, sodium, or a combination thereof, B is calcium, barium, strontium, magnesium, cadmium, zinc, or a combination thereof, and X is bromine, iodine, or a combination thereof. Further, (0&#x3c;x&#x3c;1), and (0&#x3c;y&#x3c;3).

Radiation detection apparatus and related method

A phosphor composition is derived from combining KSiF:Mnin solid form with a saturated solution of a manganese-free complex fluoride including a composition of formula I: A[MF], where A is selected from Na, K, Rb, and combinations thereof and M is selected from Al, Ga, In, Sc, Y, Gd, and combinations thereof. The composition of formula I: A[MF] has a water solubility lower than a water solubility of KSiF. A lighting apparatus including the phosphor composition is also provided.

Moisture-resistant phosphor compositions and associate methods

A process for synthesizing a color stable Mndoped phosphor includes contacting a precursor of formula I, in gaseous form at an elevated temperature with a fluorine-containing oxidizing agent to form the color stable Mndoped phosphorA[MF]:Mn&#x2003;&#x2003;Iwherein

A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of REMAScSiGeO:Cewherein RE is selected from a lanthanide ion or Y, where M is selected from Mg, Ca, Sr or Ba, A is selected from Mg or Zn and where 0&#x2266;y&#x2266;2, 2.5&#x2266;n&#x2266;3.5, 0&#x2266;w&#x2266;1, and &#x2212;1.5&#x2266;&#x3b4;&#x2266;1.5. The second phosphor includes a complex fluoride doped with manganese (Mn), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.

Phosphor materials and related devices

A color stable Mn4+ doped phosphor of formula I,A[MF]:Mn&#x2003;&#x2003;I

A method of making a core-shell phosphor is provided. The method comprises mixing a lanthanum phosphate (LaPO) core with a shell precursor mixture comprising at least one compound of La, at least one compound of Ce, and at least one compound of Tb to form a core+shell precursor mixture, heating the core+shell precursor mixture to a temperature in a range from about 900&#xb0; C. to about 1200&#xb0; C. with an inorganic flux material in presence of a reductant to provide a heated core+shell precursor mixture, cooling the heated core+shell precursor mixture to ambient temperature to provide a product core-shell phosphor dispersed in the inorganic flux material; and separating the product core-shell phosphor from the inorganic flux material.

Core shell phosphor and method of making the same

A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of ((SrM)ACe)(AlSi)OF, wherein 0&#x3c;x&#x2266;0.10, 0&#x2266;y&#x2266;0.5, 0&#x2266;z&#x2266;0.5, 0&#x2266;w&#x2266;x, A comprises Li, Na, K, or Rb; and M comprises Ca, Ba, Mg, Zn, or Sn. The second phosphor includes a complex fluoride doped with manganese (Mn), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.

A method for recovering at least one rare earth element from a phosphor is presented. The method includes a halogenation step (a) and a reduction step (b). The phosphor is first halogenated in a molten salt to convert at least one rare earth constituent contained therein to a soluble rare earth halide. Then, the rare earth halide in the molten salt can be reduced, to convert the rare earth halide to a rare earth element in its elemental state. A method for individually recovering multiple rare earth elements from a phosphor is also presented.

Rare earth recovery from phosphor material and associated method

A method of recovering a rare earth constituent from a phosphor is presented. The method can include a number of steps (a) to (d). In step (a), the phosphor is fired with an alkali material under conditions sufficient to decompose the phosphor into a mixture of oxides. A residue containing rare earth oxides is extracted from the mixture in step (b). In step (c), the residue is treated to obtain a solution, which comprises rare earth constituents in salt form. Rare earth constituents are separated from the solution in step (d).

Growing community of inventors

Bengaluru, India

Prasanth Kumar Nammalwar