期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202207123
关键词
high-lying excited states; hot excitons; organic light-emitting diodes; triplet-triplet upconversion
类别
资金
- National Key R&D Program of China [2020YFA0714604]
- Foundation of Guangdong Province [2019B121205002]
- National Nature Science Foundation of China [61975057]
- Guangdong Province Key Laboratory of Luminescence from Molecular Aggregates [2019B030301003]
- Guangzhou Science & Technology plan project [2020A0505140002]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2022-skllmd-06]
- Open Project of Wuhan National Laboratory for Optoelectronics [2019WNLOKF016]
This study investigates the exciton dynamics in anthracene derivatives-based devices through theoretical calculations and experimental methods. The efficiency of the devices is improved through doping strategy.
It is well-known that the electrically generated excitons can perform the spin evolution between high-lying excited states, providing an efficient way to utilize triplet excitons in organic light-emitting diodes (OLEDs). Anthracene families offer an opportunity to deeply investigate the processes of triplet excitons on high-lying excited states in detail. Here, a simplified model is proposed to study the exciton dynamics in anthracene derivatives-based devices. The mechanism on the processes of high-energy level intersystem crossing in anthracene derivatives is well revealed by theoretical calculation, transient electroluminescence, transient photoluminescence, and transient absorption spectrum measurements. Besides, doping strategy is proposed to suppress the exciton loss channel for improving the efficiency of devices. The studies establish an in situ method to evaluate the apparent singlet exciton formation ratio in devices due to the exciton evolution between high-lying excited states and offer some clues to further utilize these triplet excitons, thus improving the efficiency of the resulting fluorescence OLEDs in the future.
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