An organic electroluminescent device is provided. The organic electroluminescent device includes a transparent electrode layer, a reflective electrode layer, and an organic functional layer between the transparent electrode layer and the reflective electrode layer. The organic functional layer includes an emitting-material layer (300) for emitting light, and further includes a first medium functional layer between the emitting-material layer (300) and the reflective electrode layer and a second medium functional layer between the first medium functional layer and the reflective electrode layer. The first medium functional layer is optically denser than the second medium functional layer, and the first medium functional layer and the second medium functional layer are configured to cause at least a part of the light emitted undergoing a total reflection at the interface between the first medium functional layer and the second medium functional layer.