Light-emitting device, manufacturing method thereof and display device

The invention provides a light-emitting device and a manufacturing method thereof and a display device.The light-emitting device comprises a substrate, an anode, a first functional film layer, a light-emitting layer, a second functional film layer and a cathode, and the anode, the first functional film layer, the light-emitting layer, the second functional film layer and the cathode are sequentially stacked on the substrate. The second functional film layer comprises at least one of a hole barrier layer and an electron transport layer; at least part of film layers in the first functional film layer, the light-emitting layer and the second functional film layer are doped films comprising at least two materials; wherein the doping ratios of materials at different positions in the film thickness direction of at least one layer of doped thin film are different, so that an exciton recombination region formed by recombination of electrons and holes is located at a target position in the light-emitting layer. The in