| abstract |
An organic light-emitting device includes an organic layer including an emission layer between a first electrode and the second electrode, and a hole transport region including an auxiliary layer between the first electrode and the emission layer, the hole transport region. The auxiliary layer includes a first material and a second material that satisfy Equations 1-1 and 1-2:n n0 eV< E L2 −E L1 ≦0.6 eV <Equation 1-1>n n0 eV< E H1 −E H2 ≦0.6 eV <Equation 1-2>n nwherein in Equation 1-1 and 1-2, E H1 is a highest occupied molecular orbital energy (HOMO energy) of the first material; E L1 is a lowest unoccupied molecular orbital energy (LUMO energy) of the first material; E H2 is a HOMO energy of the second material; and E L2 is a LUMO energy of the second material. |