Provided is an organic light-emitting device including a first electrode, a second electrode disposed opposite to the first electrode, an emission layer disposed between the first electrode and the second electrode, and an electron-transporting layer disposed between the emission layer and the second electrode. The electron-transporting layer includes a first electron-transporting material and a second electron-transporting material. The lowest unoccupied molecular orbital (LUMO) energy level of the first electron-transporting material (EL
1
) and the lowest unoccupied molecular orbital (LUMO) energy level of the second electron-transporting material (EL
2
) satisfy the equation 0.1 eV≦|EL
1
−EL
2
|≦0.3 eV.
提供的是一种有机发光器件,包括第一电极、与第一电极相对设置的第二电极、设置在第一电极和第二电极之间的发射层,以及设置在发射层和第二电极之间的电子传输层。电子传输层包括第一电子传输材料和第二电子传输材料。第一电子传输材料的最低未占据分子轨道能级(LUMO)能量
水平(EL1)和第二电子传输材料的最低未占据分子轨道能级(LUMO)能量
水平(E
L2)满足方程0.1 eV≦|EL1−E
L2|≦0.3 eV。