Process for improved halide materials
AssigneeCurrent Lighting Solutions, LLC
InventorsSrinivas Prasad Sista, Anant Achyut Setlur
Life of this patent
Estimating the term…
Abstract
Synthesizing a color stable Mn4+ doped phosphor by contacting a gaseous fluorine-containing oxidizing agent with a precursor of: AaBbCcDdXx:Mn4+; AaiBbiCciDdXxYd:Mn4+; A13G2−m−nMnmMgnLi3F12Op; or AZF4:Mn4+. Where A is Li, Na, K, Rb, Cs, or a combination; B is Be, Mg, Ca, Sr, Ba, or a combination; C is Sc, Y, B, Al, Ga, In, Tl, or a combination; D is Ti, Zr, Hf, Rf, Si, Ge, Sn, Pb, or a combination; X is F or a combination of F and one of Br, Cl, and I; Y is O, or a combination of O and one of S and Se; A1 is Na or K, or a combination; G is Al, B, Sc, Fe, Cr, Ti, In, or a combination; Z is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y, In, or a combination.
Claims17
A process for synthesizing a color stable Mn4+ doped phosphor, the process contacting a precursor of formula I, II, III, or IV
- AaBbCcDdXx:Mn4+ (I)
- AaiBbiCciDdXxYd:Mn4+ (II)
- A13G2-m-nMnmMgnLi3F12-pOp, (III)
- AZF4:Mn4+ (IV)
- with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn4+ doped phosphor;
- wherein
- A is Li, Na, K, Rb, Cs, or a combination thereof;
- B is Be, Mg, Ca, Sr, Ba, or a combination thereof;
- C is Sc, Y, B, Al, Ga, In, Tl, or a combination thereof;
- D is Ti, Zr, Hf, Rf, Si, Ge, Sn, Pb, or a combination thereof;
- X is F or a combination of F and at least one of Br, Cl, and I;
- Y is O, or a combination of O and at least one of S and Se;
- Al is Na or K, or a combination thereof;
- G is Al, B, Sc, Fe, Cr, Ti, In, or a combination thereof;
- Z is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y, In, or a combination thereof;
- 0≤a<2;
- 0≤b<1;
- 0≤c<1;
- 0≤d≤1;
- 0.8≤ai≤1.2;
- 0.8≤bi≤1.2;
- 0≤ci≤1.2;
- 5.0≤x≤7;
- 0.8≤c+d≤1.2;
- a+2b+3c+4d=x;
- 0.8≤ci+d≤1;
- 5.0≤x+d≤7.0;
- ai+2bi+3ci+4d=x+2d;
- 0.02≤m≤0.2;
- 0≤n≤0.4;
- and
- 0≤p<1.
A process for synthesizing a color stable Mn4+ doped phosphor, the process comprising contacting a precursor of formula I with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn4+ doped phosphor
- AaBbCcDdXx:Mn4+ (I)
- wherein
- A is Li, Na, K, Rb, Cs, or a combination thereof;
- B is Be, Mg, Ca, Sr, Ba, or a combination thereof;
- C is Sc, Y, B, Al, Ga, In, Tl, or a combination thereof;
- D is Ti, Zr, Hf, Rf, Si, Ge, Sn, Pb, or a combination thereof;
- X is F or a combination of F and at least one of Br, Cl, and I;
- 0≤a<2;
- 0≤b<1;
- 0≤c<1;
- 0≤d≤1;
- 0.8≤c+d≤1.2;
- 5.0≤x≤7;
- and
- a+2b+3c+4d=x.
A process for synthesizing a color stable Mn4+ doped phosphor, the process comprising contacting a precursor of formula II with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn4+ doped phosphor
- AaiBbiCciDdXxYd:Mn4+ (II)
- wherein
- Y is O, or a combination of O and at least one of S and Se;
- 0.8≤ai≤1.2
- 0.8≤bi≤1.2
- 0≤ci≤1.2
- 0.8≤ci+d≤1
- 5.0≤x+d≤7.0;
- ai+2bi+3ci+4d=x+2d;
- and
- Y is O, or a combination of O and at least one of S and Se, wherein
- A is Li, Na, K, Rb, Cs, or a combination thereof;
- B is Be, Mg, Ca, Sr, Ba, or a combination thereof;
- C is Sc, Y, B, Al, Ga, In, TI, or a combination thereof;
- D is Ti, Zr, Hf, Rf, Si, Ge, Sn, Pb, or a combination thereof;
- X is F or a combination of F and at least one Br, Cl and I;
- and
- 0≤d≤1.
A process for synthesizing a color stable Mn4+ doped phosphor, the process comprising contacting a precursor of formula III with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn4+ doped phosphor
- A13G2-m-nMnmMgnLi3F12Op, (III)
- wherein
- A1 is Na or K, or a combination thereof;
- G is Al, B, Sc, Fe, Cr, Ti, In, or a combination thereof;
- 0.02≤m≤0.2;
- 0≤n≤0.4;
- and
- 0≤p<1.
A process for synthesizing a color stable Mn4+ doped phosphor, the process comprising contacting a precursor of formula IV with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn4+ doped phosphor
- AZF4:Mn4+ (IV)
- wherein
- Z is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y, In, or a combination thereof, and wherein A is Li, Na, K, Rb, Cs, or a combination thereof.
Dependencies are inferred from the claim text.