Electroluminescent device with integral color modifier

Claim 1

IN AN ELECTROLUMINESCENT DEVICE HAVING A PAIR OF SPACED ELECTRODES, MEANS ADAPTED TO EMIT LIGHT WHEN A VOLTAGE IS APPLIED ACROSS SAID ELECTRODES COMPRISING, IN COMBINATION, A LAYER OF PLASTIC DIELECTRIC MATERIAL DISPOSED BETWEEN SAID ELECTRODES, A FINELY-DIVIDED ELECTROLUMINESCENT PHOSPHOR THAT IS DISPERSED IN SAID LAYER OF DIELECTRIC MATERIAL AND EMITS RADIATION MAINLY IN THE YELLOW-BLUE PORTION OF THE SPECTRUM, AND A DAYLIGHT-FLUORESCENT DYE THAT COMPRISES AN INTEGRAL SOLVATED CONSTITUENT OF SAID PLASTIC DIELECTRIC LAYER AND IS HOMOGENEOUSLY DISTRIBUTED THEREIN IN INTIMATE CONTACT WITH THE ELECTROLUMINESCENT PHOSPHOR PARTICLES, SAID DYE COMPRISING AN ORGANIC MATERIAL THAT (A) IS STRONGLY EXCITED BY THE YELLOW-GREEN RADIATION GENERATED BY SAID ELECTROLUMINESCENT PHOSPHOR AND EMITS YELLOW-RED RADIATION, (B) IS ALSO EXCITED BY ITS OWN YELLOW-ORANGE EMISSION WHICH IT CONVERTS INTO ORANGERED RADIATION, AND (C) REFLECTS RED RADIATION OF THE SAME HUE AS THAT WHICH IT EMITS AND THEREBY EFFICIENTLY TRANSFORMS A PORTION OF THE ELECTROLUMINESCENT RADIATION TO RED RADIATION WHICH BLENDS WITH THE OTHER ELECTROLUMINESCENT RADIATIONS AND UNIFORMLY MODIFIES THE COLOR OF THE LIGHT NORMALLY PRODUCED BY SAID DEVICE.