Europium-activated barium magnesium aluminate phosphor
View Patent ↗A europium-activated barium aluminate phosphor is described wherein the phosphor is doped with tetravalent ions of Hf, Zr, or Si. Preferably, the phosphor is represented by (Ba 1−x Eu x )MgAl 10 O 17 :(Hf,Zr,Si) y where 0.05≦x≦0.25 and 0<y≦0.05. The tetravalent dopant ions are shown to enhance the stability of the phosphor in UV/VUV applications.
1. A europium-activated barium magnesium aluminate phosphor containing an amount of a dopant selected from silicon, hafnium, zirconium or a combination thereof.
2. The phosphor of claim 1 wherein the phosphor contains from greater than 0 to about 2000 ppm silicon by weight.
3. The phosphor of claim 1 wherein the phosphor contains from about 100 to about 400 ppm silicon by weight.
4. The phosphor of claim 1 wherein the phosphor contains from about 100 to about 200 ppm silicon by weight.
5. The phosphor of claim 1 wherein the phosphor contains from greater than 0 to about 6500 ppm zirconium by weight.
6. The phosphor of claim 1 wherein the phosphor contains from about 300 to about 1300 ppm zirconium by weight.
7. The phosphor of claim 1 wherein the phosphor contains from about 300 to about 650 ppm zirconium by weight.
8. The phosphor of claim 1 wherein the phosphor contains from greater than 0 to about 12500 ppm hafnium by weight.
9. The phosphor of claim 1 wherein the phosphor contains from about 600 to about 2500 ppm hafnium by weight.
10. The phosphor of claim 1 wherein the phosphor contains from about 600 to about 1300 ppm hafnium by weight.
11. The phosphor of claim 1 wherein the phosphor contains from about 1 to about 5 weight percent europium.
12. The phosphor of claim 1 wherein the phosphor contains about 2 weight percent europium.
13. The phosphor of claim 11 wherein the phosphor contains from greater than 0 to about 2000 ppm silicon by weight.
14. The phosphor of claim 11 wherein the phosphor contains from greater than 0 to about 6500 ppm zirconium by weight.
15. The phosphor of claim 11 wherein the phosphor contains from greater than 0 to about 12500 ppm hafnium by weight.
16. A phosphor having a composition represented by (Ba 1−x Eu x )MgAl 10 O 17 : (Hf,Zr,Si) y where 0.05≦x≦0.25 and 0<y≦0.05.
17. The phosphor of claim 16 wherein 0.0025≦y≦0.01.
18. The phosphor of claim 16 wherein 0.0025≦y≦0.005.
19. The phosphor of claim 16 wherein x is 0.1.
20. The phosphor of claim 17 wherein x is 0.1.
21. The phosphor of claim 18 wherein x is 0.1.