Light-emitting device and display device

The invention provides a light-emitting device and a display device, and relates to the technical field of display, and the light-emitting device comprises a light-emitting layer which comprises a first sub-layer, a second sub-layer and a third sub-layer, and the second sub-layer is arranged between the first sub-layer and the third sub-layer; the second sub-layer comprises a host material and a guest material; under the action of external energy, excitons are compounded in the second sub-layer; wherein the first sub-layer and the third sub-layer both comprise the main body material; the concentration of the excitons in the second sub-layer is greater than the concentration of the excitons in the first sub-layer, and the concentration of the excitons in the second sub-layer is greater than the concentration of the excitons in the third sub-layer. According to the illuminator provided by the invention, the concentration of excitons in the second sub-layer is maximum, so that the main light-emitting region can