Electroluminescent device

Claim 1

AN ELECTROLUMINESCENT CELL COMPRISING: A CONDUCTING SUBSTRATE; A SEMI-CONDUCTOR LAYER COMPRISING AN IRONTITANATE-CONTAINING MATERIAL CARRIED ON SAID CONDUCTING SUBSTRATE; A TITANATE AND MIXED GLASS BUFFER LAYER COMPRISING ELE ON SAID SEMI-CONDUCTOR LAYER; A LAYER COMPRISING ELECTROLUMINESCENT PHOSPHOR CARRIED ON SAID BUFFER LAYER; AND A LIGHT-TRANSMITTING ELECTRODE LAYER CARRIED ON SAID LAYER COMPRISING ELECTROLUMINESCENT PHOSPHOR; SAID SEMI-CONDUCTOR LAYER HAVING A VERY LOW ELECTRICAL RESISTANCE COMPARED TO THE ELECTRICAL RESISTANCE OF SAID BUFFER LAYER; SAID SEMI-CONDUCTOR LAYER ALSO HAVING A THICKNESS AT LEAST EQUAL TO THE THICKNESS OF SAID BUFFER LAYER; SAUD BUFFER LAYER COMPRISING FROM 80% TO 95% BY WEIGHT OF AT LEAST ONE FINELY DIVIDED MATERIAL OF THE GROUP CONSISTING OF BARIUM TITANATE, STRONTIUM TITANATE AND BARIUM-STRONTIUM TITANATE, AND WITH FROM 20% TO 5% BY WEIGHT OF GLASS FUSED ABOUT THE PARTICLES OF THE MATERIAL OF SAID GROUP; THE SURFACE OF SAID BUFFER LAYER ADJACENT TO SAID SEMI-CONDUCTOR LAYER BEING RICH IN GLASS AND THE SURFACE OF SAID BUFFER LAYER ADJACENT TO SAID LAYER COMPRISING ELECTROMUMINESCENT PHOSPHOR BEING SUBSTANTIALLY FREE OF IRON COMPOUND.