| 摘要 |
An organic light-emitting device comprising an anode 101, a cathode 105 and a homogeneous organic light-emitting layer 103 between the anode and the cathode. The light-emitting layer comprises a first light-emitting material mixed with an inert material; the inert material has a highest occupied molecular orbital level HOMOIM that is further from vacuum than HOMOLEM of the first light-emitting material and a lowest unoccupied molecular orbital level LUMOIM that is closer to vacuum than LUMOLEM of the first light-emitting material. The HOMO and LUMO levels of the inert material are such that the inert material provides no, or negligible charge transport or emission. The inert material comprises up to 25 mol % of the light-emitting layer. The light emitting material may be fluorescent or phosphorescent, and may be a polymer, which can comprise amine repeat units. This low concentration of the inert material has been found to increase performance when compared to a device in which it is absent. |
