Oxyfluoride phosphor compositions and lighting apparatus thereof
View Patent ↗A lighting apparatus having a phosphor material radiationally coupled to a light source is presented. The phosphor material includes a green emitting phosphor composition of general formula I: R 3−x−z M x Ce z T 5−y N y O 12−x−y F x+y ; where 0≦x<3.0; 0≦y<5.0, 0<z≦0.30; and if x=0, then y>0 or if y=0, then x>0; R is Y, Tb, Gd, La, Lu or a combination thereof; T is Al, Sc, Ga, In or combinations thereof; M is Ca, Sr, Ba or a combination thereof; N is Mg, Zn or a combination thereof. The phosphor composition of formula I may be combined with an additional phosphor to generate white light.
1. A lighting apparatus comprising a light source and a phosphor material that is radiationally coupled to the light source, the phosphor material comprising a phosphor composition of general formula I: R 3−x−z M x Ce z T 5−y N y O 12−x−y F x+y ; where 0≦x<3.0; 0≦y<5.0, 0<z≦0.30; and if x=0, then y>0 or if y=0, then x>0; R is Y, Tb, Gd, La, Lu or a combination thereof; T is Al, Sc, Ga, In or combinations thereof; M is Ca, Sr, Ba or a combination thereof; N is Mg, Zn or a combination thereof.
2. The lighting apparatus of claim 1 , wherein 0≦x<1.0.
3. The lighting apparatus of claim 1 , wherein 0≦y<2.0.
4. The lighting apparatus of claim 1 , wherein at least a portion of F in the phosphor composition of formula I is substituted by Cl, Br, I, or combinations thereof.
5. The lighting apparatus of claim 1 , wherein the phosphor composition of formula I is doped with an additional activator ion selected from a group consisting of Pr, Sm, Eu, Dy, Tm, Er, Ho, Nd, Bi, Pb and Yb.
6. The lighting apparatus of claim 1 , wherein the phosphor material comprises a phosphor composition of general formula R 3−x−z M x Ce z T 5 O 12−x F x ; where 0≦x<3.0, 0<z≦0.30; R is Y, Tb, Gd, La, Lu, or a combination thereof; M is Ca, Sr, Ba or a combination thereof; and T is Al, Sc, Ga, In or combinations thereof.
7. The lighting apparatus of claim 6 , wherein the phosphor material comprises a phosphor composition of general formula R 3−x−z M x Ce z Al 5 O 12−x F x , where 0≦x<3.0, 0<z≦0.30; and M is Ca, Sr, Ba or a combination thereof.
8. The lighting apparatus of claim 1 , wherein the phosphor material comprises a phosphor composition of general formula R 3−z Ce z T 5−y N y O 12−y F y ; where 0≦y<5.0, 0<z≦0.30; R is Y, Tb, Gd, La, Lu, or a combination thereof; T is Al, Sc, Ga, In or combinations thereof; and N is Mg, Zn or combinations thereof.
9. The lighting apparatus of claim 8 , wherein the phosphor material comprises a phosphor composition of general formula R 3−z Ce z Al 5−y N y O 12−y F y ; where 0≦y<5.0, 0<z≦0.30; and N is Mg, Zn or combinations thereof.
10. The lighting apparatus of claim 1 , wherein the phosphor composition of formula I has a peak emission in a wavelength range from about 520 nanometers to about 620 nanometers.
11. The lighting apparatus of claim 1 , wherein the phosphor composition of formula I has a peak emission in a wavelength range from about 530 nanometers to about 580 nanometers.
12. The lighting apparatus of claim 1 , wherein the phosphor material further comprises an additional phosphor composition.
13. The lighting apparatus of claim 1 , wherein the additional phosphor composition has a peak emission in a wavelength range from about 590 nanometers to about 650 nanometers.
14. The lighting apparatus of claim 12 , wherein the additional phosphor composition comprises a manganese doped complex fluoride.
15. The lighting apparatus of claim 14 , wherein the additional phosphor composition has a formula: (Na, K, Rb, Cs, NH 4 ) 2 [(Ti, Ge, Sn, Si, Zr, Hf)F 6 ]:Mn 4+ .
16. The lighting apparatus of claim 1 , wherein the light source comprises a light emitting diode (LED) device based light source.
17. A lighting apparatus comprising: a light source and a phosphor material radiationally coupled to the light source, the phosphor material comprising a blend of: a phosphor composition of general formula I: R 3−x−z M x Ce z T 5−y N y O 12−x−y F x+y ; where 0≦x<3.0; 0≦y<5.0, 0<z≦0.30; and if x=0, then y>0 or if y=0, then x>0; R is Y, Tb, Gd, La, Lu or a combination thereof; T is Al, Sc, Ga, In or combinations thereof; M is Ca, Sr, Ba or a combination thereof; N is Mg, Zn or a combination thereof, and an additional phosphor composition having a peak emission in a wavelength range from about 590 nanometers to about 650 nanometers.
18. The lighting apparatus of claim 17 , wherein the additional phosphor composition has a formula: (Na, K, Rb, Cs, NH 4 ) 2 [(Ti, Ge, Sn, Si, Zr, Hf)F 6 ]:Mn 4+ .