1 light emitting material 2 it was so patterned that the electrodes had an opposed area of 3 mm 2 in the present example the ir complex c was employed as the light emitting material 1 and an ir complex h following structural formula was employed as the light emitting material 2 the ir complex c and the ir complex h were measured in equal amounts and were agitated and mixed under crushing of the crystals in an agate mortar to obtain powder mixture thus obtained powder mixture was charged in an evaporation boat and was subjected to co evaporation with cbp as the host material the co evaporation with the host material was conducted in such a manner that the aforementioned mixture of the ir complexes represented 7 wt a device was prepared utilizing the ir complex c only as the light emitting material and executing co evaporation with the host material in such a manner that the light emitting material represented 7 wt a device was prepared utilizing the ir complex h only as the light emitting material and executing co evaporation with the host material in such a manner that the light emitting material represented 7 wt the results.