PROCESS FOR PREPARING RED-EMITTING PHOSPHORS

• Main Authors: LYONS, ROBERT JOSEPH, SETLUR, ANANT ACHYUT, MURPHY, JAMES EDWARD
• Format: Patent
• Language: English; French
• Published: 15.11.2022
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FREQUENCY-CHANGING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PHYSICS; POLISHES; SEMICONDUCTOR DEVICES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A process for preparing a Mn4+ doped phosphor of formula I A x [MF y]: Mn+4 includes contacting a mixture of a compound of formula A x[MF y], a compound of formula AX, and a Mn+n source comprising a fluoromanganese compound, with a fluorine- containing oxidizing agent in gaseous form, at an elevated temperature, to form the Mn4+ doped phosphor; wherein 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 F, CI, Br, I, HF2, or a combination thereof; x is the absolute value of the charge of the [MF y] ion; y is 5, 6 or 7; and n is 2, 3, or 4. Un procédé de préparation d'un phosphore dopé à Mn4+ de formule I A x [MF y] est décrit : Mn+4 comprend la mise en contact d'un mélange d'un composé de formule A x[MF y], d'un composé de formule AX, d'une source de Mn+n comprenant un composé de fluoromanganèse et d'un agent oxydant contenant de la fluorine en forme gazeuse à température élevée pour former un phosphore dopé à Mn4+. A est Li, Na, K, Rb, Cs ou une combinaison de ces éléments; M est Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd ou une combinaison de ces éléments; X est F, CI, Br, I, HF2 ou une combinaison de ces éléments; x est la valeur absolue de la charge de l'ion [MF y]; y est 5, 6 ou 7; et n est 2, 3 ou 4.