Swir pcLED and spinel type phosphors emitting in the 1000-1700 nm range
A wavelength converting structure is disclosed, the wavelength converting structure including a spinel type SWIR phosphor material having emission wavelengths in the range of 1000 to 1700 nm, the SWIR phosphor material including AE 1-x-z A z+0.5(x-y) D 2+0.5(x-y)-z-u E z O 4 :Ni y ,Cr u where AE=Mg, Zn, Co, or Be, or mixtures thereof, A=Li, Na, Cu, or Ag, or mixtures thereof, D=Ga, Al, B, In, or Sc, or mixtures thereof, and E=Si, Ge, Sn, Ti, Zr, or Hf, or mixtures thereof; where 0≤x≤1, 0<y≤0.1, 0≤z≤1, 0≤u≤0.2.
1. A wavelength converting structure comprising an SWIR phosphor material having emission wavelength in the range of 1000 to 1700 nm, the SWIR phosphor material represented by formula:
AE 1-x-z A z+0.5(x-y) D 2+0.5(x-y)-z-u E z O 4 :Ni y , Cr u where AE=Mg, Zn, Co, or Be, or mixtures thereof, A=Li, Na, Cu, or Ag, or mixtures thereof, D=Ga, Al, B, In, or Sc, or mixtures thereof, and E=Si, Ge, Sn, Ti, Zr, or Hf, or mixtures thereof; where 0≤x≤1, 0<y≤0.1, 0≤z≤1, 0≤u≤0.2, 0≤1−x−z, and 0≤z+0.5(x−y).
2. The wavelength converting structure of claim 1 , wherein x=1, z=0, A=Li, and D=Ga, Al, Sc, or a mixture of Al and Sc.
3. The wavelength converting structure of claim 1 , wherein x=1, z=0, A=Li, and D=Ga, Sc, or a mixture of Ga and Sc.
4. The wavelength converting structure of claim 1 , wherein the SWIR phosphor is Li 0.475 AlGa 1.475 O 4 :Ni 0.05 , Li 0.225 Mg 0.5 Ga 2.225 O 4 :Ni 0.05 , Li 0.49 Sc 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 , Li 0.532 Ga 2.35 Sc 0.1 O 4 :Ni 0.051 , Li 0.536 Al 1.01 Ga 1.44 O 4 :Ni 0.051 , Li 0.273 Mg 0.5 Sc 0.05 Ga 2.16 O 4 :Ni 0.05 , or Cr 0.1 , Li 0.49 Sc 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 , Li 0.49 Al 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 .
5. A device comprising wavelength converting structure of claim 1 and a light source, the light source configured to emit a first light, the wavelength converting structure disposed in a path of the first light, wherein the SWIR phosphor material absorbs the first light and emits a second light, the second light having a wavelength range of 1000 to 1700 nm.
6. The device of claim 5 , wherein the light source comprises an AlInGaP LED and x=1, z=0, A=Li, and D=Ga, Sc, or a mixture of Ga and Sc.
7. The device of claim 5 , wherein the wavelength converting structure comprises a second phosphor material, wherein the second phosphor material absorbs the first light emitted by the light source and emits a third light, and the SWIR phosphor material absorbs the third light and emits a fourth light, the fourth light having a wavelength range of 1000 to 1700 nm.
8. The device of claim 7 , wherein the second phosphor material is a green to red emitting phosphor and the light source is a blue emitting LED.
9. The device of claim 8 , wherein the second phosphor material is represented by formula (Sr,Ca) AlSiN 3 :Eu or by formula (Ba,Sr,Ca) 2 Si 5-x Al x O x N 8-x :Eu.
10. The device of claim 9 , wherein x=1, z=0, A=Li, and D=Ga, Sc, or a mixture of Ga and Sc and the second phosphor material is represented by formula (Ba,Sr) 2 Si 5 N 8 :Eu, and the light source is a blue light emitting InGaN LED.
11. The device of claim 7 , wherein the second phosphor is LaMgGa 11 O 19 :Ni, MgO:Ni, MgF 2 :Ni, Ga 2 O 3 :Ni, Ge, or a garnet type phosphor represented by formula RE 2 AEM g2 TV 3 O 12 :Ni (RE=Y, La, Lu, Gd, Nd, Yb, Tm, Er; AE=Ca, Sr; TV=Si, Ge).
12. The device of claim 7 , wherein the SWIR phosphor material is Li 0.49 Sc 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 , the second phosphor material is (Ba 0.4 Sr 0.6 ) 1.98 Si 5 N 8 :Eu 0.02 and the light source comprises an InGaN LED.
13. A luminescent material that emits light having a peak wavelength in the range of 1000 nm to 1700 nm, the luminescent material represented by formula:
AE 1-x-z A z+0.5(x-y) D 2+0.5(x-y)-z-u E z O 4 :Ni y , Cr u where AE=Mg, Zn, Co, or Be, or mixtures thereof, A=Li, Na, Cu, or Ag, or mixtures thereof, D=Ga, Al, B, In, or Sc, or mixtures thereof, and E=Si, Ge, Sn, Ti, Zr, or Hf, or mixtures thereof; where 0≤x≤1, 0<y≤0.1, 0≤z≤1, 0≤u≤0.2, 0≤1−x−z, and 0≤z+0.5(x−y).
14. The luminescent material of claim 13 , wherein x=1, z=0, A=Li, and D=Ga, Al, Sc, or a mixture of Al and Sc.
15. The luminescent material of claim 13 , wherein x=1, z=0, A=Li, and D=Ga, Sc, or a mixture of Ga and Sc.
16. The luminescent material of claim 13 , the luminescent material is Li 0.475 AlGa 1.475 O 4 :Ni 0.05 , Li 0.225 Mg 0.5 Ga 2.225 O 4 :Ni 0.05 , Li 0.49 Sc 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 , Li 0.532 Ga 2.35 Sc 0.1 O 4 :Ni 0.051 , Li 0.536 Al 1.01 Ga 1.44 O 4 :Ni 0.051 , Li 0.273 Mg 0.5 Sc 0.05 Ga 2.16 O 4 :Ni 0.05 , Cr 0.1 , Li 0.49 Sc 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 , or Li 0.49 Al 0.05 Ga 2.384 O 4 :Ni 0.013 , Cr 0.05 .