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Updated: May 30, 2025
Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Efficient harvesting of triplet excitons via multiple fast TTA up-conversion and high-lying reverse intersystem
Jianwen Qin1, Xianfeng Qiao1, Shu Xiao1
1Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou 510640 China msxqiao@scut.edu.cn msdgma@scut.edu.cn.
Abstract:
The efficient harvesting of triplet excitons is key to realizing high efficiency blue fluorescent organic light-emitting diodes (OLEDs). Triplet-triplet annihilation (TTA) up-conversion is one of the effective triplet-harvesting strategies. However, during the TTA up-conversion process, a high current density is necessary due to the competitive non-radiative triplet losses. In this study, we designed blue organic light-emitting diodes with fast TTA up-conversion and high-lying reverse intersystem crossing channels. It can be seen that the utilization of triplet excitons was greatly improved and the non-radiative triplet losses were significantly suppressed due to the availability of multiple efficient channels for triplet exciton utilization. As a result, a high efficiency blue fluorescent OLED was successfully fabricated. The maximum external quantum efficiency (EQE) reached 11.4% with CIE coordinates of (0.13, 0.11). This research provides a new route for the development of high efficiency blue fluorescent OLEDs.
