Phosphor composition used for fluorescent lamp and fluorescent l

Details Phosphor composition used for fluorescent lamp and fluorescent l Phosphor composition used for fluorescent lamp and fluorescent l

1989-04-28

1991-09-17

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313485, 313487, H01J 162

Patent

active

050497790

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.ltoreq.x.ltoreq.0.30 and of 0.25.ltoreq.y.ltoreq.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.

REFERENCES:
patent: 4431942 (1984-02-01), Thornton
ISE Lighting Handbook, 1984 Reference Volume, Kaufman & Christensen (editors) pp. 8-19-8-20; 8-39-8-41, illuminating Engineering Society of North America (1984).

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