Review on Photo- and Electrical Ageing Mechanisms for Neutral Excitons and Ions in Organic Light-emitting Diodes
In spite of the immense market they created, organic light-emitting diodes (OLEDs) are still facing the problem of insufficient operational lifetime, especially for the blue-emission phosphorescent or thermally activated delayed fluorescent OLEDs which exhibite the extreme efficiency limit. Interpreting their photo-electrical ageing mechanisms will give unambiguous advices on device lifetime elongation methodologies. Therefore, the mechanistic study of in-device degrading processes and predicting the diode stability not only push the technological advance but provide also interesting topics for academic exploration. Vast progresses have been made in recent years on the fundamental aspects of operational stability from physical and physical chemistry insight, of which the results as well as the theoretical and experimental approaches they used will be introduced in this review. Prospects of the further enhancement on OLED stability will also be discussed.
- This article is part of the themed collection: Recent Review Articles