Back to results
US 2003/0111953 A1Published application
Contaminant getter on UV reflective base coat in fluorescent lamps
AssigneeKoninklijke Philips Electronics N.V.
InventorCharles Trushell
Life of this patent
Estimating the term…
Abstract
An electric lamp is provided having a luminescent layer on the lamp envelope that produces visible light when impinged by ultraviolet radiation generated within the lamp. An undercoat for the electric lamp increases the luminous efficacy of the lamp. The undercoat comprises a particulate non-fluorescent material derived from a sintered mixture of an aluminum oxide material and a getter material which reacts with contaminants present in the lamp.
Claims16
1) An electric lamp, comprising:
- a) a lamp envelope having an inner surface;
- b) means within the lamp envelope for generating ultraviolet radiation;
- c) a layer of a luminescent material adjacent the inner surface of the lamp envelope for generating visible light when impinged by said ultraviolet radiation;
- and
- d) a base-coat layer, between said inner surface of said lamp envelope and said layer of luminescent material, for reflecting ultraviolet radiation which has passed through said layer of luminescent material back into said luminescent material for increasing the visible light output of said luminescent material, said base-coat layer comprising a particulate non-fluorescent oxidic material with a getter material on its surface which reacts with contaminants present in the lamp, said getter material being formed upon thermal decomposition of a getter precursor material during lehring.
2 more elements
A low pressure mercury vapor fluorescent lamp, comprising:
- a) a tubular, light transmissive lamp envelope having opposing sealed ends and an inner tubular surface;
- b) a filling of mercury and a rare gas;
- c) a pair of discharge electrodes each arranged at a respective sealed end of said lamp envelope;
- c) means for connecting said discharge electrodes to a source of electric potential outside of said lamp envelope, whereby during lamp operation a gas discharge is maintained between said discharge electrodes, which gas discharge emits ultraviolet radiation;
- d) a first, light transmissive and ultraviolet radiation reflecting layer disposed on said inner surface of said lamp envelope, said first layer comprising a sintered mixture of an aluminum oxide material and a getter material which reacts with contaminants present in the lamp;
- and
- e) a second, layer of luminescent material disposed on said first layer.
4 more elements
Dependencies are inferred from the claim text.