期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 45, 页码 50668-50674出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15208
关键词
organic light-emitting diodes; thermally activated delayed fluorescence; operational device stability; charge carrier balance; mixed-host system
资金
- Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology
- JSPS Core-to-Core Program (Japan)
Simultaneous achievement of both high electroluminescence efficiency and high operational stability in organic light-emitting diodes (OLEDs) is required for their use in various practical applications. Although OLEDs based on thermally activated delayed fluorescence-assisted fluorescence (TAF) are considered to possess a promising device architecture to exploit the full potential of OLEDs, the operational stability of such systems still requires further improvement. In this study, a quaternary emission layer consisting of a combination of TAF and mixed-host systems is developed. OLEDs containing this emission layer show improved operational stability through the management of exciton generation processes while maintaining high electroluminescence efficiency. Furthermore, a gradient of the mixed ratio of the co-host matrix is used to optimize the recombination zone profile in the emission layer, leading to 17 times improvement of the operational lifetime compared with that of the corresponding single-host-based device. This research provides a simple and general method to develop highly stable TAF-OLEDs.
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