An electroluminescent device, a method of manufacturing the same, and a display device including the same are disclosed. The electroluminescent device electroluminescent device includes a first electrode; a hole transport layer disposed on the first electrode; an emission layer disposed on the hole transport layer and including at least two light emitting particles; a first electron transport layer disposed on the emission layer and including at least two inorganic-organic composite particles; a second electron transport layer disposed on the first electron transport layer and including at least two inorganic oxide particles; and a second electrode disposed on the second electron transport layer, wherein the first electron transport layer has a lower work function than the second electron transport layer.