| abstract |
An organic electroluminescence device including a light-emitting layer which contains at least a first light-emitting material, a second light-emitting material, and an electrically inactive material having an energy difference between a highest occupied molecular orbital and a lowest unoccupied molecular orbital of 4.0 eV or larger, wherein the first light-emitting material is an electron-transporting material, the second light-emitting material is a hole-transporting material, and the light-emitting layer has a thickness within a range of from 0.5 nm to 20 nm. |