Patent number: 8710487
Abstract: A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor material radiationally coupled to the light source. The phosphor material includes a color-stable Mn+4 doped phosphor prepared by a process including providing a phosphor of formula I; Ax[MFy]:Mn+4??I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; Ax[MFy];??II wherein A is Li, Na, K, Rb, Cs, NR4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof.
Type:
Grant
Filed:
July 30, 2012
Date of Patent:
April 29, 2014
Assignee:
General Electric Company
Inventors:
Robert Joseph Lyons, Anant Achyut Setlur, Anirudha Rajendra Deshpande, Ljudmil Slavchev Grigorov
Publication number: 20120299466
Abstract: A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor material radiationally coupled to the light source. The phosphor material includes a color-stable Mn+4 doped phosphor prepared by a process including providing a phosphor of formula I; Ax[MFy]:Mn+4??I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; Ax[MFy];??II wherein A is Li, Na, K, Rb, Cs, NR4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof.
Type:
Application
Filed:
July 30, 2012
Publication date:
November 29, 2012
Applicant:
GENERAL ELECTRIC COMPANY
Inventors:
Robert Joseph Lyons, Anant Achyut Setlur, Anirudha Rajendra Deshpande, Ljudmil Slavchev Grigorov
Patent number: 8252613
Abstract: A process for preparing color stable Mn+4 doped phosphors includes providing a phosphor of formula I; Ax[MFy]:Mn+4??I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; Ax[MFy];??II wherein A is Li, Na, K, Rb, Cs, NR4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof. A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor composition radiationally coupled to the light source, and which includes a color stable Mn+4 doped phosphor.
Type:
Grant
Filed:
March 23, 2011
Date of Patent:
August 28, 2012
Assignee:
General Electric Company
Inventors:
Robert Joseph Lyons, Anant Achyut Setlur, Anirudha Rajendra Deshpande, Ljudmil Slavchev Grigorov