Method of preparing electroluminescent devices

Claim 1

IN THE PROCESS FOR PREPARING AN ELECTROLUMINESCENT DEVICE, THE STEPS WHICH COMPRISE: MIXING TOGETHER STARTING MATERIALS INCLUDING AN ACTIVATOR WHICH ARE NECESSARY FOR THE FORMATION OF AN ELECTROLUMINESCENT PHOSPHOR; PLACING SAID STARTING MATERIALS IN THE FURNACE AND FIRING TO FORM SUBSTANTIALLY ORDERED, ESSENTIALLY NON-ELECTROLUMINESCENT CRYSTALS INCLUDING SAID ACTIVATOR; REMOVING SAID SUBSTANTIALLY ORDERED, NON-ELECTROLUMINESCENT CRYSTALS FROM SAID FURNACE AND FRAGMENTING TO BREAK UP AGGLOMERATES; INTERMIXING SAID ESSENTIALLY NON-ELECTROLUMINESCENT CRYSTALS WITH A FINELY DIVIDED, LIGHT TRANSMITTING CERAMIC DIELECTRIC HAVING A MELTING POINT LOWER THAN THE SINTERING TEMPERATURE OF SAID CRYSTALS; COATING AND SAID MIXTURE ON ELECTRICALLY CONDUCTIVE BASE; FIRING AS THE NEXT FIRING IN THE PROCESS SAID COATED BASE TO ACTIVATE THE CRYSTALS AND FORM A BASE COATED WITH AN ADHERENT LAYER OF ELECTROLUMINESCENT PHOSPHOR DISPERSED WITHIN A FUSED, LIGHT TRANSMITTING CERAMIC DIELECTRIC.