Wavelength converting material for a light emitting device
Embodiments of the invention include a wavelength-converting material defined by AE 3−x1−y+z RE 3−x2+y−z [Si 9−w Al w (N 1−y C y ) [4] (N 16−z−w O z+w ) [2] ]Eu x1 ,Ce x2 , where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0≤x1≤0.18; 0≤x2≤0.2; x1+x2>0; 0≤y≤1; 0≤z≤3; 0≤w≤3.
1. A wavelength converting material comprising AE 3−x1−y+z RE 3−x2+y−z [Si 9−w Al w (N 1−y C y ) [4] (N 16−z−w O z+w ) [2] ]:Eu x1 ,Ce x2 , where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0≤x1≤0.18; 0≤x2≤0.2; x1+x2>0; 0≤y≤1; 0≤z≤3; 0≤w≤3.
2. The wavelength converting material of claim 1 wherein the wavelength converting material has a cubic crystal structure.
3. The wavelength converting material of claim 1 wherein the wavelength converting material exhibits cubic coordination of one Eu 2+ dopant site by X [2] (X=N, O) atoms.
4. The wavelength converting material of claim 1 wherein the wavelength converting material comprises star-shaped Y(SiX 4 ) 4 (Y=C, N) host lattice building blocks.
5. The wavelength converting material of claim 1 wherein an average effective ionic radii for AE+RE is no more than 120 pm.
6. The wavelength converting material of claim 1 wherein 0<y≤1.
7. The wavelength converting material of claim 1 wherein z+w>0.
8. A device comprising:
a. a light emitting diode that emits blue light; and
b. a wavelength converting material disposed in a path of the blue light, the wavelength converting material comprising AE 3−x1−y+z RE 3−x2+y−z [Si 9−w Al w (N 1−y C y ) [4] (N 16−z−w O z+w ) [2] ]:Eu x1 ,Ce x2 , where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0≤x1≤0.18; 0≤x2≤0.2; x1+x2>0; 0≤y≤1; 0≤z≤3; 0≤w≤3.
9. The device of claim 8 wherein the wavelength converting material has a cubic crystal structure.
10. The device of claim 8 wherein the wavelength converting material exhibits cubic coordination of one Eu 2+ dopant site by X [2] (X=N, O) atoms.
11. The device of claim 8 wherein the wavelength converting material comprises star-shaped Y(SiX 4 ) 4 (Y=C, N) host lattice building blocks.
12. The device of claim 8 wherein an average effective ionic radii for AE+RE is no more than 120 pm.
13. The device of claim 8 wherein the wavelength converting material is a first wavelength converting material that emits light having a peak wavelength that is red, the device further comprising a second wavelength converting material that emits light having a peak wavelength that is yellow or green.
14. The device of claim 8 wherein the wavelength converting material is formed into a ceramic.
15. The device of claim 8 , wherein the wavelength converting material has a density of at least 90% of a density of a single crystal of the wavelength converting material.
16. The device of claim 8 , wherein the wavelength converting material further comprises at least one of, a starting material used during synthesis of the wavelength converting material, or one or more fluxes used during synthesis of the wavelength converting material, or one or more scattering materials, or one or more salts.
17. The device of claim 8 , wherein the wavelength converting material is formed in a wavelength converting structure that comprises at least one of, organic phosphors, or quantum dots, or organic semiconductors, or II-VI or III-V semiconductors, or II-VI or III-V semiconductor quantum dots, or nanocrystals, or dyes, or polymers.
18. The device of claim 17 , wherein the wavelength converting structure is shaped in a square shape, or in a rectangular shape, or in a polygonal shape, or in a hexagonal shape, or in a circular shape.
19. The device of claim 18 , wherein the wavelength converting structure has a same size as the light emitting diode, or is larger than the light emitting diode, or is smaller than the light emitting diode.
20. The device of claim 8 , further comprising a backlight of a display.