(19)
(11) EP 0 136 726 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.01.1986 Bulletin 1986/04

(43) Date of publication A2:
10.04.1985 Bulletin 1985/15

(21) Application number: 84111973

(22) Date of filing: 05.10.1984
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 06.10.1983 US 539605

(71) Applicant: GTE Products Corporation
 ()

(72) Inventor:
  • White, Philip J.
     ()

   


(54) Emissive material for high intensity sodium vapor discharge device


(57) A high intensity sodium vapor discharge device includes an elongated envelope containing an elongated arc tube having a fill of noble gases and an electrode with emissive material thereon or therein with a free energy of formation per mole of oxygen more negative than the free energy of formation of barium oxide.






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