Oxy-nitride pyrosilicate based persistent phosphors
First Claim
1. A material comprising a phosphor comprising a general formula of:
-
Aa-b-cBdCe(Of-gNg);
Eub,REc,wherein;
A comprises Sr, Ca, Ba, or a combination of these metals;
B comprises Mg, Zn, Co, or a combination thereof;
C comprises Si, Ge, or a combination thereof;
a is between 1 and 2.0;
b is between 0.0005 and 0.1;
c is between 0.0005 and 0.1;
d is between 0.9 and 1;
e is between 2 and 2.1;
f is between 6 and 7;
g is between 0.001 and 0.1; and
RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof.
6 Assignments
0 Petitions
Accused Products
Abstract
A blue or yellow persistent phosphor composition is provided, along with methods for making and using the composition. In one embodiment, the phosphor comprises a formula of Aa-b-c-BdCe(Of-gNg):Eub,-REc, wherein, A may be Sr, Ca, Ba, or a combination thereof; B may be Mg, Zn, Co, or a combination thereof; C may be Si, Ge, or a combination thereof; a is between 1 and 2.0; b is between 0.0005 and 0.1; c is between 0.0005 and 0.1; d is between 0.9 and 1; e is between 2 and 2.1; f is between 6 and 7; g is between 0.001 and 0.1; and RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof. Embodiments use Sr, Mg and Si to produce blue phosphors or Ca, Mg and Si to produce yellow phosphors. In other embodiments, methods for making and applications for using, including uses in toys, emergency equipment, clothing, and instrument panels, are provided.
-
Citations
19 Claims
-
1. A material comprising a phosphor comprising a general formula of:
-
Aa-b-cBdCe(Of-gNg);
Eub,REc,wherein; A comprises Sr, Ca, Ba, or a combination of these metals; B comprises Mg, Zn, Co, or a combination thereof; C comprises Si, Ge, or a combination thereof; a is between 1 and 2.0; b is between 0.0005 and 0.1; c is between 0.0005 and 0.1; d is between 0.9 and 1; e is between 2 and 2.1; f is between 6 and 7; g is between 0.001 and 0.1; and RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof. - View Dependent Claims (2, 3, 4)
-
-
5. A method for producing a phosphor, the method comprising:
-
providing amounts of nitrogen-containing compounds, oxygen-containing compounds of europium, RE, or a co-precipated mixture of oxygen-containing compounds, at least one alkaline-earth metal selected from the group consisting of Ba, Sr, Ca, and combinations thereof, at least one metal selected from the group consisting of Mg, Zn, Co and combinations thereof, and at least one metal selected from the group consisting of Si, Ge and combinations there of, wherein RE is at least one of neodymium or dysprosium Er, Ho, Tm, Yb; mixing together the compounds to form a mixture; and then firing the mixture at a temperature between about 900°
C. and about 1700°
C. under a reducing atmosphere for a sufficient period of time to convert the mixture to a phosphor comprising a general formula of;
Aa-b-cBdCe(Of-gNg);
Eub,REc,wherein; A comprises Sr, Ca, Ba, or a combination of these metals; B comprises Mg, Zn, Co, or a combination thereof; C comprises Si, Ge, or a combination thereof; a is between 1 and 2.0; b is between 0.0005 and 0.1; c is between 0.0005 and 0.1; d is between 0.9 and 1; e is between 2 and 2.1; f is between 6 and 7; g is between 0.001 and 0.1; and RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof. - View Dependent Claims (6, 7, 8, 9, 18, 19)
-
-
10. An article of manufacture containing a phosphor, comprising:
-
a structure comprising a phosphor, wherein the phosphor has a general formula of;
Aa-b-c,BdCe(Of-gNg);
Eub,REc,wherein; A comprises Sr, Ca, Ba, or a combination of these metals; B comprises Mg, Zn, Co, or a combination thereof; C comprises Si, Ge, or a combination thereof; a is between 1 and 2.0; b is between 0.0005 and 0.1; c is between 0.0005 and 0.1; d is between 0.9 and 1; e is between 2 and 2.1; f is between 6 and 7; g is between 0.001 and 0.1; and RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
Specification