An organic light emitting device comprises an emissive layer stack having an anode side and a cathode side, comprising at least one emissive layer comprising an organic emissive material, an anode layer stack comprising at least one conductive layer, a cathode layer stack comprising at least one conductive layer, an anode-side reflector positioned on the anode side of the emissive layer stack, and a cathode-side reflector positioned on the cathode side of the emissive layer stack, wherein the anode-side reflector and the cathode side reflector are configured to form a resonant, electrically pumped cavity for ultrastrong coupling having a quality factor of at least 10. An electrically-pumped organic light emitting device is also disclosed.