Efficient MR-TADF emitters are developed with U-shaped molecular structures for solution-processed OLEDs. The excellent performance with an EQEmax of 27.6% is among the best solution-processed OLEDs based on MR-TADF emitters.
Solution-processed TADF polymer sensitized MR-TADF OLEDs demonstrate EQE of 15.7% with a narrow FWHM of 48 nm.
A donor planarization strategy creates pure-red MR-TADF emitters. The resulting RBN-ICz shows emission at 615 nm (full-width at half-maximum: 0.15 eV) and enables an OLED with 34.1% external quantum efficiency and CIE coordinates of (0.67, 0.33).
Narrowband emissive fluorophores are designed and synthesized by combining multiple-resonance chromophore and anthracene units, which also exhibit capability to rapidly convert triplet excitons into singlet excitons via high-lying reverse intersystem crossing.
This review addresses the importance of Pd-catalyzed reactions in the synthesis of MR-TADF emitters, particularly Suzuki coupling and Buchwald–Hartwig cross-coupling reactions, and can provide enough ideas for the development of new MR emitters.