Orange-red persistent phosphors
View Patent ↗Orange-red phosphors activated by europium and rare earth ions of formula I and formula II are long persistent, stable, and non-toxic M 1 F 2 -M 1 S: Eu 2+ , Ln 3+ (I) M 2 3 M 3 2 O 5 X 2 : inside or outside Eu 2+ , Ln 3+ (II) wherein M 1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof; M 2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof; M 3 is Al, Ga, B, In, or a combination thereof; X is F, Cl, Br, I, or a combination thereof; and Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.
1. A phosphor activated by europium and rare earth ions, said phosphor selected from phosphors of formula I and phosphors of formula II;
M 1 F 2 -M 1 S: Eu 2+ , Ln 3+ (I)
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Ln 3+ (II)
wherein
M 1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof;
M 2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof;
M 3 is Al, Ga, B, In, or a combination thereof;
X is F, Cl, Br, I, or a combination thereof; and
Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.
2. A phosphor according to claim 1 , of formula I
M 1 F 2 -M 1 S: Eu 2+ , Dy 3+ (I).
3. A phosphor according to claim 1 , of formula II
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
4. A phosphor according to claim 1 , of formula II
Sr 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
5. A phosphor according to claim 1 , of formula II
M 2 3 Al 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
6. A phosphor according to claim 1 , of formula
SrF 2 —SrS: Eu 2+ , Dy 3+ .
7. A phosphor according to claim 1 , of formula
Sr 3 Al 2 O 5 Cl 2 : Eu 2+ , Dy 3+ .
8. A composition comprising a phosphor of formula I or II, dispersed in a polymer matrix;
M 1 F 2 -M 1 S: Eu 2+ , Ln 3+ (I)
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Ln 3+ (II)
wherein
M 1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof;
M 2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof;
M 3 is Al, Ga, B, In, or a combination thereof;
X is F, Cl, Br, I, or a combination thereof; and
Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.
9. A composition according to claim 8 , wherein the phosphor is of formula I
M 1 F 2 -M 1 S: Eu 2+ , Dy 3+ (I).
10. A composition according to claim 8 , wherein the phosphor is of formula II
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
11. A composition according to claim 8 , wherein the phosphor is of formula
Sr 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ .
12. A composition according to claim 8 , wherein the phosphor is of formula
M 2 3 Al 2 O 5 X 2 : Eu 2+ , Dy 3+ .
13. A composition according to claim 8 , wherein the phosphor is of formula
SrF 2 —SrS: Eu 2+ , Dy 3+ .
14. A composition according to claim 8 , wherein the phosphor is of formula
Sr 3 Al 2 O 5 Cl 2 : Eu 2+ , Dy 3+
15. A lighting apparatus comprising a light source and a phosphor of formula I or II radiationally coupled to the light source
M 1 F 2 -M 1 S: Eu 2+ , Ln 3+ (I)
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Ln 3+ (II)
wherein
M 1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof;
M 2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof;
M 3 is Al, Ga, B, In, or a combination thereof;
X is F, Cl, Br, I, or a combination thereof; and
Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.
16. A lighting system according to claim 15 , wherein the phosphor is of formula I
M 1 F 2 -M 1 S: Eu 2+ , Dy 3+ (I).
17. A lighting system according to claim 15 , wherein the phosphor is of formula II
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
18. A lighting system according to claim 15 , wherein the phosphor is of formula
Sr 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ .
19. A lighting system according to claim 15 , wherein the phosphor is of formula
M 2 3 Al 2 O 5 X 2 : Eu 2+ , Dy 3+ .
20. A lighting system according to claim 15 , wherein the phosphor is of formula
SrF 2 —SrS: Eu 2+ , Dy 3+ .
21. A lighting system according to claim 15 , wherein the phosphor is of formula
Sr 3 Al 2 O 5 Cl 2 : Eu 2+ , Dy 3+ .
22. A phosphor blend comprising a phosphor of formula I or II, dispersed in a polymer matrix;
M 1 F 2 -M 1 S: Eu 2+ , Ln 3+ (I)
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Ln 3+ (II)
wherein
M 1 is Ba, Sr, Ca, Zn, Mg, or a combination thereof;
M 2 is Ba, Sr, Ca, Mg, Zn, or a combination thereof;
M 3 is Al, Ga, B, In, or a combination thereof;
X is F, Cl, Br, I, or a combination thereof; and
Ln is Dy, Yb, Tm, Er, Ho, Sm, Nd, or a combination thereof.
23. A phosphor blend according to claim 22 , comprising a phosphor of formula I
M 1 F 2 -M 1 S: Eu 2+ , Dy 3+ (I).
24. A phosphor blend according to claim 22 , comprising a phosphor of formula II
M 2 3 M 3 2 O 5 X 2 : Eu 2+ , Dy 3+ (II).
25. A phosphor blend according to claim 22 , comprising a phosphor of formula
SrF 2 —SrS: Eu 2+ , Dy 3+ .
26. A phosphor blend according to claim 22 , comprising a phosphor of formula
Sr 3 Al 2 O 5 Cl 2 : Eu 2+ , Dy 3+ .