Blue-green and green phosphors for lighting applications
First Claim
Patent Images
1. 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, 0swsx, A is Li, Na, K, or any combinations thereof, M is Ca, Ba, or any combinations thereof; and
light emitted by the phosphor is blue-green to green in color, having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength.
11 Assignments
0 Petitions
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.
-
Citations
26 Claims
-
1. 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, 0swsx, A is Li, Na, K, or any combinations thereof, M is Ca, Ba, or any combinations thereof; and
light emitted by the phosphor is blue-green to green in color, having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength. - View Dependent Claims (2)
-
-
3. A phosphor of formula
((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;0swsx; A is Li, Na, K, or a combination thereof; M is Ca, Ba, Mg, or a combination thereof; and light emitted by the phosphor under 405 nm excitation, is blue-green to green in color, having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- zMz)1−
-
14. A phosphor blend comprising a blue-green to green phosphor having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength, of formula
((Sr1−- zMz)1−
x+w)AwCex)3(Al1−
ySiy)O4+y+3(x−
w)F1−
y−
(x−
w),wherein 0<
x≦
0.10;0<
y≦
0.5;0≦
z≦
0.5;0swsx; A is Li, Na, K, or a combination thereof; and M is Ca, Ba, Mg, or a combination thereof. - View Dependent Claims (15, 16, 17, 18, 19, 20)
- zMz)1−
-
21. 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 comprising a blue-green to green phosphor having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength, configured to be radiationally coupled to the light source, of formula
((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;0swsx; A is Li, Na, K, or a combination thereof; and M is Ca, Ba, Mg, or a combination thereof. - View Dependent Claims (22, 23, 24, 25, 26)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeCurrent Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
-
Original AssigneeGeneral Electric Company
-
InventorsSetlur, Anant Achyut, Chandran, Ramachandran Gopi, Henderson, Claire Susan, Nammalwar, Pransanth Kumar, Radkov, Emil
-
Primary Examiner(s)Le, Emily
-
Assistant Examiner(s)EDMONDSON, LYNNE RENEE
-
Application NumberUS12/256,142Publication NumberTime in Patent Office1,511 DaysField of Search252/301.4 H, 252/301.6 R, 252/301.4 R, 313/467, 313/468, 313/503, 313/565, 313/567, 313/571US Class Current252/301.4HCPC Class CodesC09K 11/7721 AluminatesC09K 11/77214 AluminosilicatesH01L 2224/04042 Bonding areas specifically ...H01L 2224/06102 the bonding areas being at ...H01L 2224/48091 ArchedH01L 2224/48247 connecting the wire to a bo...H01L 2224/48257 connecting the wire to a di...H01L 2224/49107 on the semiconductor or sol...H01L 2224/73265 Layer and wire connectorsH01L 2224/8592 Applying permanent coating,...H01L 2924/00012 Relevant to the scope of th...H01L 2924/00014 the subject-matter covered ...H01L 2924/181 EncapsulationH01L 33/502 Wavelength conversion mater...Y02B 20/00 Energy efficient lighting t...
