| abstract |
This description relates to an organic light emitting device, the organic light emitting device comprising: an anode; a cathode arranged to face the anode; a light emitting layer arranged between the anode and the cathode, wherein the organic light emitting device includes an an electron transport layer between the cathode and the light-emitting layer, the electron transport layer includes a first electron transport layer and a second electron transport layer, the first electron transport layer is disposed adjacent to the light-emitting layer, and the second electron transport layer The recombination energy of an electron transport layer is equal to or less than the LUMO energy difference between the light emitting layer and the first electron transport layer. |