Organic light emitting device and display apparatus

An organic light emitting device, comprising an anode, a cathode, and an emitting layer disposed between the anode and the cathode, an electron block layer being disposed between the emitting layer and the anode, and a hole block layer being disposed between the emitting layer and the cathode;

• wherein the emitting layer comprises a host material and a dopant material doped in the host material;
• the host material comprises a first host material and a second host material, and the first host material, the second host material, the electron block layer, and the hole block layer satisfy:
• |HOMO1-host-HOMOEBL|≤0.2 eV,|LUMOHBL-LUMO2-host|≤0.2 eV,
• wherein HOMO1-host is a highest occupied molecular orbital HOMO energy level of the first host material;
• HOMOEBL is a HOMO energy level of the electron block layer;
• LUMO2-host is a lowest unoccupied molecular orbital LUMO energy level of the second host material, and LUMOHBL is a LUMO energy level of the hole block layer.