| 초록 |
The exploitation of the full potential of organic electroluminescence has been retarded by poor longevity of devices. The instability originates from irreversible, chemical degradation of emitting layers. However, the chemical mechanism by which degradation initiates and propagates has yet to be fully established. We proposed that the degradation involves exciton-mediated formation of a radical ion pair between dopants and hosts. Mechanistic studies were performed for difference classes of dopants, including blue-phosphorescent Ir(III) complexes and organic molecules displaying thermally activated delayed fluorescence, with employing a variety of chemical techniques. The investigations supported our mechanism, and provided novel designs for improved stability. The research demonstrated the importance of controlling exciton-induced electron transfer within organic devices. |
