Electroluminescent lamp having a moisture resistant vitreous light-transmitting material which includes 4 to 8% lif

Claim 1

IN COMBINATION WITH AN ELECTROLUMINESCENT DEVICE THE OPERATIVE PORTION OF WITCH COMPRISES SPACED ELECTRODES, ONE OF WHICH IS LIGHT-TRANSMITTING, WITH ELECTROLUMINESCENT PHOSPHOR EMBEDDED IN LIGHT-TRANSMITTING VITREOUS MATERIAL INCLUDED BETWEEN SAID SPACED ELECTRODES, THE IMPROVEMENT WHICH COMPRISES, A VITREOUS LIGHT-TRANSMITTING LAYER OVER SAID LIGHT-TRANSMITTING ELECYTRODE AND EXTERIOR TO THE OPERATIVE PORTION OF SAID DEVICE, SAID VITREOUS LAYER CONSISTING ESSENTIALLY OF THE FOLLOWING CONSTITUENTS WITHIN ABOUT THE SPECIFIED RELATIVE PROPORTIONS BY WEIGHT: 23% TO 38% B2O3, 1% TO 15% SIO2, 10% TO 52% BAO, 5% TO 27% ZNO, 4% TO 7% FIF, 2% TO 8% MGO, 0 TO 5% NA2O, TO 0 TO 8% CAO, AND 0 TO 6% AL2O3.