Fluorescent lamp with high color rendering index and coating systems therefor
A coating system for a fluorescent lamp, and fluorescent lamps provided therewith. The coating system includes a phosphor-containing coating containing a mixture of phosphors that contain less than 10% weight rare earth phosphors. The phosphor-containing coating emits visible light having a color rendering index of at least 87 when excited by UV radiation.
1. A coating system comprising a phosphor-containing coating containing phosphors, the phosphors within the phosphor-containing coating consisting of a mixture of phosphors that comprise at least one non-rare-earth blue halophosphor and at least one white halophosphor, wherein rare earth-containing phosphors constitute not more than about 10 weight percent of the phosphor content of the coating, the phosphor-containing coating emitting visible light having a color rendering index of at least 87 when excited by UV radiation;
wherein the visible light has a CCT at a value within a range of about 3000 K to about 4100 K.
2. The coating system according to claim 1 , wherein the mixture of phosphors contains above 0 to about 20 weight percent of the at least one white halophosphor.
3. The coating system according to claim 1 , wherein the mixture of phosphors further comprises at least one strontium red phosphor.
4. The coating system according to claim 1 , wherein the mixture of phosphors comprises at least one blue-green emitting rare earth phosphor.
5. The coating system according to claim 1 , wherein the visible light emitted by the phosphor-containing coating has a CCT of about 3000 K.
6. The coating system according to claim 1 , wherein the visible light emitted by the phosphor-containing coating has a CCT of about 3500 K.
7. The coating system according to claim 1 , wherein the visible light emitted by the phosphor-containing coating has a CCT of about 4100 K.
8. The coating system according to claim 1 , wherein the phosphor-containing coating consists of a single layer within the coating system and all phosphors within the coating system are within the phosphor-containing coating.
9. A fluorescent lamp having the coating system of claim 1 .
10. The fluorescent lamp according to claim 9 , wherein the mixture of phosphors contains about 5 to about 15 weight percent of the at least one white halophosphor.
11. The fluorescent lamp according to claim 9 , wherein the mixture of phosphors further comprises at least one strontium red phosphor.
12. The fluorescent lamp according to claim 9 , wherein the mixture of phosphors comprises at least one blue-green emitting rare earth phosphor.
13. The fluorescent lamp according to claim 9 , wherein the visible light emitted by the fluorescent lamp has a CCT of about 3000 K.
14. The fluorescent lamp according to claim 9 , wherein the visible light emitted by the fluorescent lamp has a CCT of about 3500 K.
15. The fluorescent lamp according to claim 9 , wherein the visible light emitted by the fluorescent lamp has a CCT of about 4100 K.
16. The fluorescent lamp according to claim 9 , wherein the phosphor-containing coating consists of a single layer within the coating system and all phosphors within the coating system are within the phosphor-containing coating.
17. A fluorescent lamp having a coating system that comprises a phosphor-containing coating containing phosphors, the phosphors within the phosphor-containing coating consisting of a mixture of phosphors that comprise at least one white halophosphor, at least one strontium red phosphor, at least one non-rare-earth blue halophosphor, wherein rare earth-containing phosphors constitute not more than about 10 weight percent of the phosphor content of the coating,
the fluorescent lamp in operation emitting visible light having a color rendering index of at least 87,
wherein the visible light emitted by the fluorescent lamp has a CCT at a value within a range of about 3000 K to about 4100 K.