Illumination system comprising composite monolithic ceramic luminescence converter

Patent metadata

Field	Value
Publication number	US-10023796-B2
Application number	US-52508508-A
Country	US
Kind code	B2
Filing date	Jan 31, 2008
Priority date	Feb 7, 2007
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

An illumination system comprising a radiation source and a monolithic ceramic luminescence converter comprising a composite material of at least one luminescent compound, and at least one non-luminescent compound, wherein the material of the non-luminescent compound comprises silicon and nitrogen, is advantageously used, when the luminescent compound comprises an rare-earth metal-activated host compound also comprising silicon and nitrogen. Shared chemical characteristics of the luminescent compound and the non-luminescent material improve phase assemblage, thermal and optical behavior. The invention relates also to a composite monolithic ceramic luminescence converter.

First claim

The invention claimed is:

1. An illumination system comprising a radiation source and a monolithic ceramic luminescence converter comprising a composite material comprising at least one luminescent compound comprising at least one activator in a host lattice and at least one non-luminescent compound, wherein the luminescent compound and the non-luminescent compound each comprise silicon and nitrogen and wherein the host lattice and the non-luminescent compound are different materials, wherein the luminescent compound is an amber or red-emitting europium(II)-doped alkaline earth oxonitridoaluminosilicate compound of general formula Ba 2−x−z M X Si 5−y Al y N 8−y O y : Eu z , wherein M=Sr, Ca; 0≤x≤2, 0≤y≤4, 0.0005≤z≤0.06 and the non-luminescent compound is an alkaline earth oxonitridoaluminosilicate compound of general formula Ba 1−x M X Si 7−y Al y N 10−y O y , wherein M=Sr, Ca, Eu; 0≤x≤1 and 0≤y≤3.

2. An illumination system according to claim 1 , wherein the radiation source is a light emitting diode.

3. An illumination system according to claim 1 , wherein the compounds additionally comprise one or more elements selected from the group of oxygen, boron, aluminum, gallium, germanium, phosphorus and carbon.

4. An illumination system according to claim 1 , wherein the non-luminescent compound additionally comprises metal selected from the group of alkali metals Na, K, Rb; alkaline earth metals Be, Mg, Ca, Sr, Ba or group IIIB metals selected from the group Sc, Y, and La.

5. An illumination system according to claim 1 , wherein the composite material additionally comprises a sinter-additive.

6. An illumination system according to claim 4 , wherein the non-luminescent compound additionally comprises a modifier, selected from the group of transition metals Zr, Hf, Nb, Ta, W, Mo, Cr, Fe, Co, Ni, Zn, Sc, Y, La, main group elements Pb, Bi and f elements Ce, Cr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, and U.

7. An illumination system according to claim 1 , wherein the compound class of the luminescent compound and the non-luminescent compound is selected from the group of nitridosilicates, oxonitridosilicates, nitridoaluminosilicates and oxonitridoaluminosilicates.

8. An illumination system according to claim 6 , wherein the at least one activator is selected from the rare earth metals cerium, praseodymium, samarium, europium, terbium, ytterbium, and manganese.

9. An illumination system comprising a radiation source and a monolithic ceramic luminescence converter comprising a composite material comprising at least one luminescent compound comprising at least one activator in a host lattice and at least one non-luminescent compound, wherein the luminescent compound and the non-luminescent compound each comprise silicon and nitrogen and wherein the host lattice and the non-luminescent compound are different materials, wherein the composite material is a particle-particle composite.

10. An illumination system according to claim 9 , wherein the luminescent compound is an amber or red-emitting europium(II)-doped alkaline earth oxonitridoaluminosilicate compound of general formula Ba 2−x−z M X Si 5−y Al y N 8−y O y :Eu z , wherein M=Sr, Ca; 0≤x≤2, 0≤y≤4, 0.0005≤z≤0.06 and the non-luminescent compound is an alkaline earth oxonitridoaluminosilicate compound of general formula Ba 1−x M X Si 7−y Al y N 10−y O y , wherein M=Sr, Ca, Eu; 0≤x≤1 and 0≤y≤3.

11. An illumination system comprising a radiation source and a monolithic ceramic luminescence converter comprising a composite material comprising at least one luminescent compound comprising at least one activator in a host lattice and at least one non-luminescent compound, wherein the luminescent compound and the non-luminescent compound each comprise silicon and nitrogen and wherein the host lattice and the non-luminescent compound are different materials, wherein the composite material is a particle-matrix composite.

12. An illumination system according to claim 1 , wherein the composite material is a stacked multilayer composite.

13. An illumination system according to claim 1 , wherein the density of the composite material is ≥97% of the theoretical density.

14. An illumination system according to claim 9 , wherein the radiation source is a light emitting diode.

15. An illumination system according to claim 9 , wherein the compounds additionally comprise one or more elements selected from the group of oxygen, boron, aluminum, gallium, germanium, phosphorus and carbon.

16. An illumination system according to claim 9 , wherein the non-luminescent compound additionally comprises metal selected from the group of alkali metals Na, K, Rb; alkaline earth metals Be, Mg, Ca, Sr, Ba or group IIIB metals selected from the group Sc, Y, and La.

17. An illumination system according to claim 9 , wherein the composite material additionally comprises a sinter-additive.

18. An illumination system according to claim 9 , wherein the non-luminescent compound additionally comprises a modifier, selected from the group of transition metals Zr, Hf, Nb, Ta, W, Mo, Cr, Fe, Co, Ni, Zn, Sc, Y, La, main group elements Pb, Bi and f elements Ce, Cr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, and U.

19. An illumination system according to claim 9 , wherein the compound class of the luminescent compound and the non-luminescent compound is selected from the group of nitridosilicates, oxonitridosilicates, nitridoaluminosilicates and oxonitridoaluminosilicates.

20. An illumination system according to claim 9 , wherein the at least one activator is selected from the rare earth metals cerium, praseodymium, samarium, europium, terbium, ytterbium, and manganese.

21. An illumination system according to claim 9 , wherein the density of the composite material is ≥97% of a theoretical density.

22. An illumination system according to claim 11 , wherein the radiation source is a light emitting diode.

23. An illumination system according to claim 11 , wherein the compounds additionally comprise one or more elements selected from the group of oxygen, boron, aluminum, gallium, germanium, phosphorus and carbon.

24. An illumination system according to claim 11 , wherein the non-luminescent compound additionally comprises metal selected from the group of alkali metals Na, K, Rb; alkaline earth metals Be, Mg, Ca, Sr, Ba or group IIIB metals selected from the group Sc, Y, and La.

25. An illumination system according to claim 11 , wherein the composite material additionally comprises a sinter-additive.

26. An illumination system according to claim 11 , wherein the non-luminescent compound additionally comprises a modifier, selected from the group of transition metals Zr, Hf, Nb, Ta, W, Mo, Cr, Fe, Co, Ni, Zn, Sc, Y, La, main group elements Pb, Bi and f elements Ce, Cr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, and U.

27. An illumination system according to claim 11 , wherein the compound class of the luminescent compound and the non-luminescent compound is selected from the group of nitridosilicates, oxonitridosilicates, nitridoaluminosilicates and oxonitridoaluminosilicates.

28. An illumination system according to claim 11 , wherein the at least one activator is selected from the rare earth metals cerium, praseodymium, samarium, europium, terbium, ytterbium, and manganese.

29. An illumination system according to claim 11 , wherein the density of the composite

Assignees

• Schmidt Peter J
• Beckers Lucas Johannes Anna Maria
• Meyer Joerg
• Schreinemacher Baby Seriyati
• Schreinemacher Herbert
• Lumileds Llc

Inventors

• Schmidt Peter J
• Beckers Lucas Johannes Anna Maria
• Meyer Joerg
• Schreinemacher Baby-Seriyati
• Schreinemacher Herbert

Classifications

• H10W72/877

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• C04B2235/6582

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• C04B2235/80

  Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title

• C04B2235/442

  Carbonates · CPC title