Blue-green phosphor for fluorescent lighting applications
First Claim
1. A fluorescent lamp comprising a first phosphor layer for converting ultraviolet radiation to visible illumination, said layer comprising a red phosphor emitting at about 610 to 640 nm with a peak emission at about 610 to 625 nm, a green phosphor emitting at about 500 nm to about 600 nm with a peak emission at about 535 to about 555 nm, and a blue phosphor emitting at about 440 to about 470 nm and a phosphor having the formula Sr4Al14O25:
- EU2+, wherein said visible light has predetermined color coordinates on the CIE scale wherein the x value is in the range of 0.3 to 0.4 and y is in the range of 0.3 to 0.4.
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Accused Products
Abstract
A fluorescent lamp including a phosphor layer including Sr4Al14O25:Eu2+ (SAE) and at least one of each of a red, green and blue emitting phosphor. The phosphor layer can optionally include an additional, deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of SAE in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over, the course of the lamp life.
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Citations
19 Claims
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1. A fluorescent lamp comprising a first phosphor layer for converting ultraviolet radiation to visible illumination, said layer comprising a red phosphor emitting at about 610 to 640 nm with a peak emission at about 610 to 625 nm, a green phosphor emitting at about 500 nm to about 600 nm with a peak emission at about 535 to about 555 nm, and a blue phosphor emitting at about 440 to about 470 nm and a phosphor having the formula Sr4Al14O25:
- EU2+, wherein said visible light has predetermined color coordinates on the CIE scale wherein the x value is in the range of 0.3 to 0.4 and y is in the range of 0.3 to 0.4.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A phosphor blend suitable for use in fluorescent lighting applications, said blend comprising a red emitting phosphor, a green emitting phosphor, a blue emitting phosphor, and Sr4Al14O25:
- Eu2+, wherein said phosphor blend comprises about 35 to about 50 percent by weight of said red phosphor, about 5 to about 20 percent of said blue phosphor, about 15 to about 45 percent of said green phosphor and about 5 to about 30 percent of Sr4Al14O25;
Eu2+. - View Dependent Claims (15, 16, 17, 18)
- Eu2+, wherein said phosphor blend comprises about 35 to about 50 percent by weight of said red phosphor, about 5 to about 20 percent of said blue phosphor, about 15 to about 45 percent of said green phosphor and about 5 to about 30 percent of Sr4Al14O25;
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19. A fluorescent lamp comprising a first phosphor layer for converting ultraviolet radiation to visible illumination, said layer comprising a red phosphor emitting at about 610 to 640 nm with a peak emission at about 610 to 625 nm, a green phosphor emitting at about 500 nm to about 600 nm with a peak emission at about 535 to about 555 nm, and a blue phosphor emitting at about 440 to about 470 nm and a phosphor having the formula Sr4Al14O25:
- Eu2+, wherein said first phosphor layer comprises about 35 to about 50 percent by weight of said red phosphor, about 5 to about 20 percent of said blue phosphor, about 15 to about 45 percent of said green phosphor and about 5 to about 30 percent of Sr4Al14O25;
Eu2+.
- Eu2+, wherein said first phosphor layer comprises about 35 to about 50 percent by weight of said red phosphor, about 5 to about 20 percent of said blue phosphor, about 15 to about 45 percent of said green phosphor and about 5 to about 30 percent of Sr4Al14O25;
Specification