To reveal superior efficiency/CRI/color-stability trade-off for OWLED fabrications, a single-host concept is proposed in which the primary-color emitters are rationally arranged to render two types (R-G-B and RG-B) of OWLEDs with ultrahigh electroluminescence performance. Comprehensive experimental and theoretical evidence reveal that careful management of charges and excitons is the key to the realization of such high performances.