Low-pressure mercury discharge lamp with luminescent layer

Details Low-pressure mercury discharge lamp with luminescent layer Low-pressure mercury discharge lamp with luminescent layer

1997-08-29

1999-11-30

O'Shea, Sandra

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313487, H01J 6144

Patent

active

059948310

ABSTRACT:
A low-pressure mercury discharge lamp is provided with a discharge vessel (1) which encloses a discharge space (2) in a gastight manner and in which a filling including mercury is accommodated. The lamp is provided with means (3a, 3b) for maintaining an electric discharge in the discharge space. The discharge vessel is provided with a luminescent layer (5). The lamp generates light during operation with a spectrum which is substantially composed of radiation in a first wavelength region from 590 to 630 nm, a second wavelength region from 520 to 565 nm, and in a third wavelength region from 430 to 490 nm. The radiation in the wavelength interval from 590 to 600 nm accounts for at least 50% of the power of the radiation in the entire first wavelength region. A preferred embodiment of the lamp includes a luminescent material that complies with the formula M1.sub.x M2.sub.(1-x-y) BO.sub.3 :Eu.sup.3+.sub.y, in which M1 is an element from the group formed by Sc, In, and Lu, and in which M2 is an element from the group formed by Sc, Y, La, Gd, Ga, In, and Lu, where M1 is different from M2, with 0.01.ltoreq.y.ltoreq.0.2, x>0, x+y<1, while the luminescent material has a calcite lattice structure.

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patent: 4946621 (1990-08-01), Fouassier et al.
W.A. Thornton, Three Color Visual Response, J. Opt. Soc. Am. vol. 62, No. 3, pp. 457-459, Mar. 1972.

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