BLUE-GREEN AND GREEN PHOSPHORS FOR LIGHTING APPLICATIONS
First Claim
1. A lighting apparatus comprising:
- a light source configured to emit radiation with a peak intensity at a wavelength between about 250 nm and about 550 nm; and
a phosphor composition configured to be radiationally coupled to the light source, wherein the phosphor composition comprises a phosphor comprising a general formula of ((Sr1−
zMz)1−
(x+w)AwCex)3(Al1−
ySiy)O4+y+3 (x−
w)F1−
y−
3(x−
w), wherein 0<
x≦
0.10, 0≦
y≦
0.5, 0≦
z≦
0.5, 0≦
w≦
x, A is Li, Na, K, Rb, or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof.
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Accused Products
Abstract
Embodiments of the present techniques provide a related family of phosphors that may be used in lighting systems to generate blue or blue-green light. The phosphors include systems having a general formula of: ((Sr1−zMz)1−(x+w)AwCex)3(Al1−ySiy)O4+y+3(x−w)F1−y−3(x−w) (I), wherein 0<x≦0.10, 0≦y≦0.5, 0≦z≦0.5, 0≦w≦x, A is Li, Na, K, Rb, or Ag or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. Advantageously, phosphors made accordingly to these formulations maintain emission intensity across a wide range of temperatures. The phosphors may be used in lighting systems, such as LEDs and fluorescent tubes, among others, to produce blue and blue/green light. Further, the phosphors may be used in blends with other phosphors, or in combined lighting systems, to produce white light suitable for illumination.
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Citations
25 Claims
-
1. A lighting apparatus comprising:
-
a light source configured to emit radiation with a peak intensity at a wavelength between about 250 nm and about 550 nm; and a phosphor composition configured to be radiationally coupled to the light source, wherein the phosphor composition comprises a phosphor comprising a general formula of ((Sr1−
zMz)1−
(x+w)AwCex)3(Al1−
ySiy)O4+y+3 (x−
w)F1−
y−
3(x−
w), wherein 0<
x≦
0.10, 0≦
y≦
0.5, 0≦
z≦
0.5, 0≦
w≦
x, A is Li, Na, K, Rb, or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A phosphor comprising a general formula of ((Sr1−
- zMz)1−
(x+w)AwCex)3(Al1−
ySiy)O4+y+3(x−
w)F1−
y−
3(x−
w), wherein 0<
x≦
0.10, 0≦
y≦
0.5, 0≦
z≦
0.5, 0≦
w≦
x, A is Li, Na, K, or Rb, or any combinations thereof, and M is Ca, Ba, Mg, or Zn, or any combinations thereof. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- zMz)1−
-
20. A phosphor blend comprising:
-
a first phosphor comprising a general formula of ((Sr1−
zMz)1−
(x+w)AwCex)3(Al1−
ySiy)O4+y+3(x−
w)F1−
y−
3(x−
w), wherein 0<
x≦
0.10, 0≦
y≦
0.5, 0≦
z≦
0.5, 0≦
w≦
x, A is Li, Na, K, or Rb, or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof; andat least one additional phosphor, wherein the phosphor blend is capable of emitting light suitable for use either alone or in combination with radiation emitted by a light source radiationally coupled to the phosphor. - View Dependent Claims (21, 22, 23)
-
-
24. A method for producing a phosphor, the method comprising:
-
providing amounts of oxygen-containing compounds of cerium , silicon, and at least one alkaline-earth metal selected from the group consisting of Sr, Ba, Ca, and combinations thereof; mixing together the oxygen-containing compounds with a fluoride containing compound 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 ((Sr1−
zMz)1−
(x+w)AwCex)3(Al1−
ySiy)O4+y+3(x−
w)F1−
y−
3(x−
w), wherein 0<
x≦
0.10, 0≦
y≦
0.5, 0≦
z≦
0.5, 0≦
w≦
x, A is Li, Na, K, or Rb, or any combinations thereof, and M is Ca, Ba, Mg, Zn, or any combinations thereof. - View Dependent Claims (25)
-
Specification