Phosphor blend for a compact fluorescent lamp and lamp containing same
View Patent ↗A phosphor blend for a compact fluorescent lamp is described wherein the phosphor blend comprises a green-emitting Tb 3+ phosphor, a Y 2 O 3 :Eu 3+ phosphor, a Sr 6 BP 5 O 20 :Eu 2+ phosphor, a Mg 4 GeO 5.5 F:Mn 4+ phosphor, and optionally a BaMgAl 11 O 17 :Eu 2+ phosphor, wherein the blend contains from 1% to 20% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor and from 5% to 30% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor. A compact fluorescent lamp having a phosphor coating containing the phosphor blend produces a light that is perceived as more pleasing than the light produced by standard compact fluorescent lamps.
1. A phosphor blend for a compact fluorescent lamp, comprising: a green-emitting Tb 3+ phosphor, a Y 2 O 3 :Eu 3+ phosphor, a Sr 6 BP 5 O 20 :Eu 2+ phosphor, a Mg 4 GeO 5.5 F; Mn 4+ phosphor, and optionally a BaMgAl 11 O 17 :Eu 2+ phosphor, wherein the blend contains from 1% to 20% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor and from 5% to 30% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.
2. The phosphor blend of claim 1 wherein the blend contains from 40% to 70% by weight of the Y 2 O 3 :Eu 3+ phosphor, from 20% to 50% by weight of the green-emitting Tb 3+ phosphor, and from 0 to 10% by weight of the BaMgAl 11 O 17 :Eu 2+ phosphor.
3. A phosphor blend for a compact fluorescent lamp, comprising from 20% to 30% by weight of at least one phosphor selected from a LaPO 4 :Ce 3+ , Tb 3+ phosphor and a CeMgAl 11 O 19 :Tb 3+ phosphor, from 40% to 70% by weight of a Y 2 O 3 :Eu 3+ phosphor, from 1% to 5% by weight of a Sr 6 BP 5 O 20 :Eu 2+ phosphor, from 10% to 30% by weight of a Mg 4 GeO 5.5 F:Mn 4+ phosphor, and from 0 to 2% by weight of a BaMgAl 11 O 17 :Eu 2+ phosphor.
4. The phosphor blend of claim 3 wherein the phosphor blend contains about 27% by weight of the LaPO 4 :Ce 3+ , Tb 3+ phosphor, about 54% by weight of the Y 2 O 3 :Eu 3+ phosphor, about 5% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, about 15% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor, and less than about 0.1% by weight of the BaMgAl 11 O 17 :Eu 2+ phosphor.
5. The phosphor blend of claim 4 wherein the phosphor blend contains 26.8% by weight of the LaPO 4 :Ce 3+ , Tb 3+ phosphor, 54.0% by weight of the Y 2 O 3 :Eu 3+ phosphor, 4.7% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, and 14.5% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.
6. A compact fluorescent lamp having a phosphor coating comprising a blend of a green-emitting Tb 3+ phosphor, a Y 2 O 3 :Eu 3+ phosphor, a Sr 6 BP 5 O 20 :Eu 2+ phosphor, a Mg 4 GeO 5.5 F:Mn 4+ phosphor, and optionally a BaMgAl 11 O 17 :Eu 2+ phosphor, wherein the blend contains from 1% to 20% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor and from 5% to 30% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.
7. The compact fluorescent lamp of claim 6 wherein the blend contains from 40% to 70% by weight of the Y 2 O 3 :Eu 3+ phosphor, from 20% to 50% by weight of the green-emitting Tb 3+ phosphor, and from 0 to 10% by weight of the BaMgAl 11 O 17 :Eu 2+ phosphor.
8. The compact fluorescent lamp of claim 6 wherein the lamp produces light having a correlated color temperature of about 2700 K.
9. The compact fluorescent lamp of claim 6 wherein the blend contains from 20% to 30% by weight of at least one phosphor selected from a LaPO 4 :Ce 3+ , Tb 3+ phosphor and a CeMgAl 11 O 19 :Tb 3+ phosphor, from 40% to 70% by weight of the Y 2 O 3 :Eu 3+ phosphor, from 1% to 5% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, from 10% to 30% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor, and from 0 to 2% by weight of the BaMgAl 11 O 17 :Eu 2+ phosphor.
10. The compact fluorescent lamp of claim 9 wherein the blend contains about 27% by weight of the LaPO 4 :Ce 3+ , Tb 3+ phosphor, about 54% by weight of the Y 2 O 3 :Eu 3+ phosphor, about 5% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, about 15% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor, and less than about 0.1% by weight of the BaMgAl 11 O 17 :Eu 2+ phosphor.
11. The compact fluorescent lamp of claim 10 wherein the blend contains 26.8% by weight of the LaPO 4 :Ce 3+ , Tb 3+ phosphor, 54.0% by weight of the Y 2 O 3 :Eu 3+ phosphor, 4.7% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, and 14.5% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.
12. The compact fluorescent lamp of claim 11 wherein the lamp produces light having a correlated color temperature of about 2700 K.
13. The compact fluorescent lamp of claim 6 wherein the green-emitting phosphor is a CeMgAl 11 O 19 :Tb 3+ phosphor and the blend contains from 50 to 60% by weight of the Y 2 O 3 :Eu 3+ phosphor, from 25 to 35% by weight of the CeMgAl 11 O 19 :Tb 3+ phosphor, from 3% to 8% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, and from 5 to 15% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.
14. The phosphor blend of claim 1 wherein the green-emitting phosphor is a CeMgAl 11 O 19 :Tb 3+ phosphor and the blend contains from 50 to 60% by weight of the Y 2 O 3 :Eu 3+ phosphor, from 25 to 35% by weight of the CeMgAl 11 O 19 :Tb 3+ phosphor, from 3% to 8% by weight of the Sr 6 BP 5 O 20 :Eu 2+ phosphor, and from 5 to 15% by weight of the Mg 4 GeO 5.5 F:Mn 4+ phosphor.