Process for improved halide materials

Patent metadata

Field	Value
Publication number	US-10954438-B2
Application number	US-201515574539-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	May 18, 2015
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

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.

First claim

The invention claimed is:

1. A process for synthesizing a color stable Mn 4+ doped phosphor, the process contacting a precursor of formula I, II, III, or IV
A a B b C c D d X x :Mn 4+   (I)

A ai B bi C ci D d X x Y d :Mn 4+   (II)

A 1 3 G 2-m-n Mn m Mg n Li 3 F 12-p O p ,  (III)

AZF 4 :Mn 4+   (IV)

with a fluorine-containing oxidizing agent in gaseous form at an elevated temperature to form the color stable Mn 4+ 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.

2. A process according to claim 1 , wherein the precursor is formula I.

3. A process according to claim 1 , wherein X is F.

4. A process according to claim 1 , wherein Y is O.

5. A process according to claim 1 , wherein B is Ca, Sr, Ba, or a combination thereof.

6. A process according to claim 1 , wherein C is Al, Ga, or a combination thereof.

7. A process according to claim 1 , wherein D is Si, Ge, Ti, or a combination thereof.

8. A process according to claim 1 , wherein the fluorine-containing oxidizing agent is F 2 .

9. A process according to claim 1 , wherein the temperature ranges from about 200° C. to about 700° C.

10. A color stable Mn 4+ doped phosphor prepared by a process according to claim 1 .

11. A lighting apparatus comprising a semiconductor light source; and color stable Mn 4+ doped phosphor prepared by a process according to claim 1 .

12. A backlighting light source apparatus comprising a semiconductor light source; and color stable Mn 4+ doped phosphor prepared by a process according to claim 1 .

13. A liquid crystal display apparatus comprising: a liquid crystal panel; and the backlighting light source apparatus according to claim 12 disposed on a back surface of the liquid crystal panel.

14. A process for synthesizing a color stable Mn 4+ 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 Mn 4+ doped phosphor
A a B b C c D d X x :Mn 4+   (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.

15. A process for synthesizing a color stable Mn 4+ 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 Mn 4+ doped phosphor
A ai B bi C ci D d X x Y d :Mn 4+   (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.

16. A process for synthesizing a color stable Mn 4+ 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 Mn 4+ doped phosphor
A 1 3 G 2-m-n Mn m Mg n Li 3 F 12 O p ,  (III)

wherein
A 1 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.

17. A process for synthesizing a color stable Mn 4+ 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 Mn 4+ doped phosphor
AZF 4 :Mn 4+   (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.

Assignees

• Current Lighting Solutions Llc

Inventors

• Sista Srinivas Prasad
• Setlur Anant Achyut

Classifications

• H10W90/756

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/628

  with alkali or alkaline earth metals · CPC title

• C09K11/675

  with alkali or alkaline earth metals · CPC title