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US5049779A
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Phosphor composition used for fluorescent lamp and fluorescent lamp using the same
Assignee: Nichia Corp
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Filing: 1989-04-28
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Granted: 1991-09-17
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Expires: 2009-04-28
Abstract
Abstract A phosphor composition and a lamp having a phosphor film formed of the composition. The composition contains red, green and blue luminescence components. The blue component emits blue light by the excitation of 253.7-nm ultraviolet light. It has a main luminescence peak wavelength of 460 to 510 nm, and a half width of the main peak of a luminescence spectrum of not less than 50 nm. The color coordinates of the luminescence spectrum of the blue component falls within a range of 0.15≦x≦0.30 and of 0.25≦y≦0.40 based on the CIE 1931 standard chromaticity diagram. The blue component has a spectral reflectance of not less 80% at 380 to 500 nm, assuming that a spectral reflectance of a smoked magnesium oxide film is 100%. The amount of the blue component, with respect to the total weight of the composition, is specified within a region enclosed with solid lines (inclusive) connecting coordinate points a (5%, 2,500 K), b (5% 3,500 K), c (45% 8,000 K) d (95% 8,000 K), e (95% 7,000 K) and f (65%, 4,000 K) shown in FIG. 1 which are determined in accordance with a color temperature of the luminescence spectrum of the phosphor composition.
Inventors
- 👤 Yuji Itsuki
- 👤 Keiji Ichinomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:40
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
158 words
A phosphor composition for a low pressure mercury vapor lamp comprising: a red luminescence component; a green luminescence component; and a blue luminescence component which emits blue light by the excitation of 253.7-nm ultraviolet light and has a main luminescence peak wavelength of 460 to 510 nm, a half width of the main peak of a luminescence spectrum of not less than 50 nm, color coordinates of the luminescence spectrum falling within a range of 0.15≦x≦0.30 and 0.25≦y≦0.40 based on CIE 1931 standard chromaticity, and a spectral reflectance of not less 80% at 380 to 500 nm, when the spectral reflectance of a smoked magnesium oxide film is 100%, the mixing weight ratio of said blue luminescence component with respect to a total composition amount within the area defined by points a, b, c, d, e and f of FIG. 1, which points are determined according to the color temperature of the luminescence spectrum of said phosphor composition.
Claim 2
Dependent Claim
158 words
A phosphor composition for a low pressure mercury vapor lamp comprising: a red luminescence component; a green luminescence component; and a blue luminescence component which emits blue light by the excitation of 253.7-nm ultraviolet light and has a main luminescence peak wavelength of 460 to 510 nm, a half width of the main peak of a luminescence spectrum of not less than 50 nm, color coordinates of the luminescence spectrum falling within a range of 0.15≦x≦0.30 and 0.25≦y≦0.40 based on CIE 1931 standard chromaticity, and a spectral reflectance of not less 80% at 380 to 500 nm, when the spectral reflectance of a smoked magnesium oxide film is 100%, the mixing weight ratio of said blue luminescence component with respect to a total composition amount within the area defined by points a, b, c, d, e and f of FIG. 1, which points are determined according to the color temperature of the luminescence spectrum of said phosphor composition.
Claim 3
Dependent Claim
39 words
A composition according to claim 1, wherein a main luminescence peak wavelength of said green luminescence component falls within a range of 530 to 550 nm, and a half width of the peak is not more than 10 nm.
Claim 4
Dependent Claim
39 words
A composition according to claim 1, wherein a main luminescence peak wavelength of said red luminescence component falls within a range of 600 to 660 nm, and a half width of the peak is not more than 10 nm.
Claim 5
Dependent Claim
44 words
A composition according to claim 1, wherein said blue luminescence component contains at least one member selected from the group consisting of an antimony-activated calcium halophosphate phosphor, a magnesium tungstate phosphor, a titanium-activated barium pyrophosphate phosphor, and a divalent europium-activated barium magnesium silicate phosphor.
Claim 6
Dependent Claim
29 words
A composition according to claim 2, wherein a cerium/terbium-coactivated lanthanum phosphate phosphor and a cerium/terbium-coactivated magnesium aluminate phosphor are used as said green luminescence component singly or in combination.
Claim 7
Dependent Claim
47 words
A composition according to claim 3, wherein said red luminescence component contains at least one member selected from the group consisting of a trivalent europium-activated yttrium oxide phosphor, a trivalent europium-activated yttrium phosphovanadate phosphor, a trivalent europium-activated yttrium vanadate phosphor, and a divalent manganese-activated magnesium fluogermanate phosphor.
Claim 8
Dependent Claim
162 words
A low pressure mercury vapor lamp having a phosphor film containing a phosphor composition comprising: a red luminescence component; a green luminescence component; and a blue luminescence component which emits blue light by the excitation of 253.7-nm ultraviolet light and has a main luminescence peak wavelengths of 460 to 510 nm, a half width of the main peak of a luminescence spectrum of not less than 50 nm, color coordinates of the luminescence spectrum falling within a range of 0.15≦x≦0.30 and 0.25≦y≦0.40 based on CIE 1931 standard chromaticity, and a spectral reflectance of not less 80% at 380 to 500 nm, when the spectral reflectance of a smoked magnesium oxide film is 100%, the mixing weight ratio of said blue luminescence component with respect to a total composition amount within the area defined by points a, b, c, d, e and f or FIG. 1, which points are determined according to the color temperature of the luminescence spectrum of said phosphor composition.
Claim 9
Dependent Claim
162 words
A low pressure mercury vapor lamp having a phosphor film containing a phosphor composition comprising: a red luminescence component; a green luminescence component; and a blue luminescence component which emits blue light by the excitation of 253.7-nm ultraviolet light and has a main luminescence peak wavelengths of 460 to 510 nm, a half width of the main peak of a luminescence spectrum of not less than 50 nm, color coordinates of the luminescence spectrum falling within a range of 0.15≦x≦0.30 and 0.25≦y≦0.40 based on CIE 1931 standard chromaticity, and a spectral reflectance of not less 80% at 380 to 500 nm, when the spectral reflectance of a smoked magnesium oxide film is 100%, the mixing weight ratio of said blue luminescence component with respect to a total composition amount within the area defined by points a, b, c, d, e and f or FIG. 1, which points are determined according to the color temperature of the luminescence spectrum of said phosphor composition.
Claim 10
Dependent Claim
39 words
A lamp according to claim 7, wherein a main luminescence peak wavelength of said green luminescence component falls within a range of 530 to 550 nm, and a half width of the peak is not more than 10 nm.
Claim 11
Dependent Claim
39 words
A lamp according to claim 7, wherein a main luminescence peak wavelength of said red luminescence component falls within a range of 600 to 660 nm, and a half width of the peak is not more than 10 nm.
Claim 12
Dependent Claim
44 words
A lamp according to claim 7, wherein said blue luminescence component contains at least one member selected from the group consisting of an antimony-activated calcium halophosphate phosphor, a magnesium tungstate phosphor, a titanium-activated barium pyrophosphate phosphor, and a divalent europium-activated barium magnesium silicate phosphor.
Claim 13
Dependent Claim
29 words
A lamp according to clam 8, wherein a cerium/terbium-coactivated lanthanum phosphate phosphor and a cerium/terbium-coactivated magnesium aluminate phosphor are used as said green luminescence component singly or in combination.
Claim 14
Dependent Claim
29 words
A lamp according to clam 8, wherein a cerium/terbium-coactivated lanthanum phosphate phosphor and a cerium/terbium-coactivated magnesium aluminate phosphor are used as said green luminescence component singly or in combination.
Claim 15
Dependent Claim
47 words
A lamp according to claim 9, wherein said red luminescence component contains at least one member selected from the group consisting of a trivalent europium-activated yttrium oxide phosphor, a trivalent europium-activated yttrium phosphovanadate phosphor, a trivalent europium-activated yttrium vanadate phosphor, and a divalent manganese-activated magnesium fluogermanate phosphor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |