High color rendering fluorescent lamp

Details High color rendering fluorescent lamp High color rendering fluorescent lamp

1987-01-22

1987-11-10

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014F, H01J 6148

Patent

active

047059869

ABSTRACT:
A high color rendering fluorescent lamp having two-layered phosphor coating, wherein a first layer is formed immediately on the inner face of glass tube containing phosphors of alkaline earth halophosphate activated by antimony manganese or of alkaline earth holophosphate activated by antimony or both, and a second layer (an overriding layer) is formed on the first layer containing a phosphor having peak wavelength of emission at 470 nm-500 nm and absorbing line spectrum of mercury in visible short wavelength range, at least one of a phosphor of (Sr, Mg).sub.3 (PO.sub.4).sub.2 :Sn and a phosphor of (Sr, Ba).sub.3 (PO.sub.4).sub.2 :Sn.

REFERENCES:
patent: 3569764 (1971-03-01), Hanada
patent: 4088923 (1978-05-01), Manders
patent: 4267485 (1981-05-01), Murakami et al.
patent: 4431942 (1984-02-01), Thornton

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