An organic light emitting diode is disclosed. The organic light emitting diode includes an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode. The light emitting layer includes a first phosphorescent light emitting layer, a first isolation layer, a blue fluorescent light emitting layer, a second isolation layer, and a second phosphorescent light emitting layer, which are stacked along a direction from the anode to the cathode. The first isolation layer is configured to conduct holes and to block electrons, and the second isolation layer is configured to conduct electrons and to block holes. The exciton recombination zone is constrained in the blue fluorescent light emitting layer, thus improving the light emitting efficiency and light stability of the organic light emitting diode.