Journal
CHEMICAL ENGINEERING JOURNAL
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131691
Keywords
Thermally activated delayed fluorescence; Orange-red emitter; Intramolecular energy transfer; Solution processable OLEDs
Categories
Funding
- National Natural Science Foundation of China [51773021, 51911530197, U1663229, 51473140]
- Six talent peaks project in Jiangsu Province [XCL-102]
- Universities in Jiangsu Province [19KJA430002]
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Efficient orange-red/red TADF emitters were achieved by encapsulating the red-emitting core with a blue emitting chromophore, demonstrating effective intramolecular energy transfer. The novel compounds showed higher photoluminescence quantum yields and improved external quantum efficiency in OLEDs compared to traditional TA-based OLEDs. This research provides an effective method for designing highly efficient red TADF molecules through intramolecular energy transfer.
Realizing effective orange-red/red emission is still far behind blue and green emission in thermally activated delayed fluorescence (TADF) materials. In this context, a novel strategy for achieving efficient orange-red/red TADF emitters is proposed via intramolecular energy transfer by encapsulating the red-emitting core with a blue emitting chromophore. Two novel compounds called TS-1 and TS-2 were prepared and characterized, in which two blue TADF emitting units are used as the end groups and a red TADF emitter as the molecular core (TA). Both compounds show clear TADF character with red emission at 655 nm in a neat film, suggesting an effective intramolecular energy transfer from the blue chromophores to the red one. Both TS-1 and TS-2 present higher photoluminescence quantum yields (70-90%) than the TA core (42%) due to the encapsulation and energy transfer. Solution-processable organic light-emitting diodes (OLEDs) exhibit a maximum external quantum efficiency of similar to 13% for compound TS-1, much higher than that of TA-based OLEDs (2.3%). This research is the first example for red TADF emitter via intramolecular energy transfer, which clearly provides an effective method for designing highly efficient red TADF molecules.
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