Electrode for discharge lamp with yttrium and lanthanum...

Details Electrode for discharge lamp with yttrium and lanthanum... Electrode for discharge lamp with yttrium and lanthanum...

H - Electricity

01

J

313/131, 313/187

H01J 61/073 (2006.01)

Patent

CA 1169468

W.E. 48,922 An electrode for a discharge lamp, such as a high pressure metal vapor lamp or fluorescent lamp comprises an electrode substrate and an electron emission material on the substrate. The emission material comprises a mixture of yttrium oxide and lanthanum oxide. me molar ratio of lanthanum oxide, yttrium oxide is in the range of 1 : 9 to 19 : 1 and the emission material contains in addition, barium-strontium-calcium tungstate and an alkaline earth metal oxide. The electrode so produced improves the luminous flux maintenance of a metal vapor discharge lamp and reduce the starting voltage of fluorescent lamps in neither case producing black depositions on the ends of the tube.

357799

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