Electric lamp having fluorescent lamp colors containing a wide b

Details Electric lamp having fluorescent lamp colors containing a wide b Electric lamp having fluorescent lamp colors containing a wide b

1995-12-13

1997-03-18

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313486, 2523014R, H01J 162, H01J 6304, C09K 1108

Patent

active

056125909

ABSTRACT:
A phosphor blend and a low pressure discharge lamp utilizing such a phosphor blend is provided having a lamp envelope 3 having an inner surface 15, means 5,6,7,9,13 within the lamp envelope for generating ultraviolet radiation; and a layer 17 of a luminescent material adjacent the inner surface of the lamp envelope for generating visible light when impinged by the ultraviolet radiation. The luminescent material is a phosphor blend consisting essentially of (1) a first luminescent material comprising gadolinium and magnesium pentaborate, preferably activated by cerium, manganese, and terbium; (2) a second luminescent zinc silicate material; (3) a third luminescent alkaline earth halophosphate material; and (4) a fourth luminescent alkaline earth metal halophosphate material, the components of said blend being combined in proportions which are selected depending on the lamp color desired whereby a full spectrum in visible and CRI values of at least 82 are provided.

REFERENCES:
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patent: 4208448 (1980-06-01), Panaccione
patent: 4602188 (1986-07-01), de Hair et al.
patent: 4800319 (1989-01-01), Van Kemenade et al.
patent: 4933600 (1990-06-01), Endres
patent: 4950948 (1990-08-01), Peters et al.
patent: 5049779 (1991-09-01), Itsuji et al.
patent: 5447660 (1995-09-01), Chau
patent: 5471113 (1995-11-01), De Backer et al.

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