Luminescent material, especially for application in mercury vapo

Details Luminescent material, especially for application in mercury vapo Luminescent material, especially for application in mercury vapo

1989-03-22

1991-04-02

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313487, 313635, 2523014R, H01J 6304

Patent

active

050049488

ABSTRACT:
In a luminescent material which comprises a first component for luminescing red light under influence of incident optical radiation and a second component for luminescing in the spectral range from 520 to 560 nm, the second component includes a first phase of garnet crystallization system consisted of yttrium aluminate activated by trivalent cerium and determined by the general structural formula Y.sub.3-a Ce.sub.a Al.sub.5 O.sub.12, wherein 0.0003<a<0.1, and a second phase of hexagonal crystallization system of general structural formula La.sub.b Ce.sub.1-b Al.sub.11 O.sub.18, wherein O<b<1, and the second phase is present in an amount ranging from the amounts detectable by means of X-ray diffractometry to the double amount of the first phase. In a low-pressure or high-pressure mercury vapor gas discharge lamp, comprising a hermetically sealed discharge vessel including at least two electrodes for generating a gas discharge process, an inner surface is covered by a luminescent material, comprising the two phases mentioned above, wherein the composition of the two phases is determined by the general structural formula Y.sub.3-a Ce.sub.a Al.sub.5 O.sub.12 +xLa.sub.b Ce.sub.1-b Al.sub. 11 O.sub.18, wherein O<x<2, 0.0003<a<0.1 and O<b<1 and the second phase is present in an amount ranging from the amounts detectable by means of X-ray diffractometry to the double amount of the first phase.

REFERENCES:
patent: 2748303 (1956-05-01), Thorington
patent: 3569762 (1971-03-01), Levine et al.
patent: 4034257 (1977-07-01), Hoffman
patent: 4241276 (1980-12-01), Wyner et al.
patent: 4431942 (1984-02-01), Thornton
patent: 4727283 (1988-02-01), Kemenade et al.
Journal of El. Chem. Soc. article (Feb. 1973) pp. 278-281, Solid-State Science and Technology.

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