Organic electroluminescent device, display panel and display device

An organic electroluminescent device comprising:

• a first electrode;
• a second electrode;
• and
• an organic layer located between the first electrode and the second electrode,
• wherein the organic layer comprises a light-emitting layer, the light-emitting layer comprises a host material, a thermally activated delayed fluorescence sensitizer and a green fluorescent dye, and the green fluorescent dye is selected from any one of following compounds as shown in C-1 to C-204:
• the thermally activated delayed fluorescence sensitizer comprises one or a combination of at least two of following compounds as shown in T-1 to T-99:
• wherein in T-71, T-72 and T-73, n is either 1, 2 or 3 independently;
• the host material comprises one or a combination of at least two of following compounds as shown in GPH-1 to GPH-75 and GPH-77 to GPH-80:
• wherein the organic layer further comprises a combination of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer;
• and
• wherein a material of the hole injection layer is a co-doped mixed layer of HI-2 and HT-24: