Wavelength converting material for a light emitting device
Embodiments of the invention include a light source and a nitridoberyllate phosphor disposed in a path of light emitted by the light source. The nitridoberyllate phosphor includes a trigonal planar BeN 3 structure and/or a tetrahedral Be(N,O) 4 structure.
1. A luminescent material comprising:
a host lattice comprising a tetrahedral Be(N,O) 4 structure; and
a dopant species.
2. The luminescent material of claim 1 wherein the dopant species is either Eu or Ce.
3. The luminescent material of claim 1 wherein the host lattice is SrBe 6 ON 4 .
4. The luminescent material of claim 1 wherein the host lattice is M 1−x SrBe 6 ON 4 where M is Ca, Sr, Ba, or a mixture thereof and the dopant species is Eu x where 0<x≤0.1.
5. A device comprising:
a light source; and
a nitridoberyllate phosphor disposed in a path of light emitted by the light source, the nitridoberyllate phosphor comprising a tetrahedral Be(N,O) 4 structure.
6. The device of claim 5 wherein the nitridoberyllate phosphor is disposed in a transparent matrix.
7. The device of claim 5 wherein the nitridoberyllate phosphor is selected from the group consisting of SrBe 6 ON 4 :Eu and M 1−x SrBe 6 ON 4 :Eu x where M is Ca, Sr, Ba, or a mixture thereof and 0<x≤0.1.
8. A luminescent material comprising:
a host lattice comprising a trigonal planar BeN 3 structure; and
a dopant species.
9. The luminescent material of claim 8 wherein the host lattice is SrBeSi 2 N 4 .
10. The luminescent material of claim 8 wherein the host lattice is M 1−x BeSi 2 N 4 where M is Ca, Sr, Ba, or a mixture thereof and the dopant species is Eu x where 0<x≤0.1.
11. The luminescent material of claim 8 wherein the dopant species is either Eu or Ce.
12. A device comprising:
a light source; and
a nitridoberyllate phosphor disposed in a path of light emitted by the light source, the nitridoberyllate phosphor comprising a trigonal planar BeN 3 structure.
13. The device of claim 12 wherein the nitridoberyllate phosphor is disposed in a transparent matrix.
14. The device of claim 12 wherein the nitridoberyllate phosphor is selected from the group consisting of SrBeSi 2 N 4 :Eu and M 1−x BeSi 2 N 4 :Eu x where M is Ca, Sr, Ba, or a mixture thereof and 0<x≤0.1.