MR-TADF Emitters Based On Quinolino[3,2,1-de]Acridine-5,9-Dione (QAO)

Abstract

Herein, we report a versatile synthetic strategy for quinolino[3,2,1-de]acridine-5,9-diones 1-3 (QAO). This approach provided efficient access to QAO-based TADF emitters in good yields and enabled fine tuning of their photophysical properties. Remarkably, sulfur-containing compound exhibits TADF even in non-degassed toluene solution, indicating highly efficient reverse intersystem crossing (RISC). In 1-wt% mCP-doped films, the delayed lifetime increased to 35.8 μs, while the photoluminescence quantum yield reached 60%. The methyl-substituted QAO derivative (2) exhibits narrowband blue emission with a full width at half maximum (FWHM) of only 26 nm together with prompt and delayed fluorescence lifetimes at 8.83 ns and 3.08 μs, respectively, in degassed toluene solution.

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References

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