CPC H10K 85/631 (2023.02) [H10K 50/12 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 50/15 (2023.02); H10K 50/171 (2023.02)] | 20 Claims |
1. A light emitting device, wherein the light emitting device comprises a first electrode, a second electrode, and a light emitting unit located between the first electrode and the second electrode, and the light emitting unit comprises a doped electron-barrier layer, a blue-light host layer and a doped blue-light host layer that are stacked;
the doped electron-barrier layer comprises an electron-barrier host material and a first guest material that is doped in the electron-barrier host material;
the blue-light host layer comprises a first blue-light host material;
the doped blue-light host layer comprises a second blue-light host material and a second guest material that is doped in the second blue-light host material; and
a singlet-state energy level of the first blue-light host material is higher than a singlet-state energy level of the first guest material and a singlet-state energy level of the second guest material.
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