Processes for preparing color stable red-emitting phosphors

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United States of America Patent

PATENT NO 10072206
APP PUB NO 20180002598A1
SERIAL NO

15197891

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Processes for preparing color stable red-emitting phosphors include contacting a complex fluoride phosphor of formula I with a first fluorine-containing oxidizing agent in gaseous form at a first temperature ranging from 200° C. to 700° C. to form a first product phosphor, contacting the first product phosphor in particulate form with a solution of a compound of formula II in aqueous hydrofluoric acid to form a treated phosphor, and contacting the treated phosphor with a second fluorine-containing oxidizing agent in gaseous form at a second temperature <225° C.,

description='In-line Formulae' end='lead'AxMFy:MN4+  Idescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'AxMFy  IIdescription='In-line Formulae' end='tail'

wherein A is independently at each occurrence Li, Na, K, Rb, Cs or a combination thereof, M is independently at each occurrence Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof, x is absolute value of the charge of the MFy ion; and y is 5, 6 or 7.

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Patent OwnerAddress
ATLANTIC PARK STRATEGIC CAPITAL FUND L P AS COLLATERAL AGENT535 MADISON AVENUE 31ST FLOOR NEW YORK NY 10017

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Du, Fangming Hudson, US 34 190
Murphy, James Edward Niskayuna, US 59 352
Setlur, Anant Achyut Niskayuna, US 103 4302

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