Two cyano-substituted spiro[fluorine-9,9′-xanthene] (SFX) derivatives, 2-carbonitrile-spiro[fluorene-9,9′-xanthene] (CNSFX) and 2,7-dicarbonitrile-spiro[fluorene-9,9′-xanthene] (DCNSFX) were conveniently prepared as electron acceptors to combine with tris(4-carbazoyl-9-ylphenyl)amine (TCTA) as electron donor to form exciplex emitters, respectively. Favorable exciplex-TADF was successfully achieved with photoluminescence quantum yield of 31% and electroluminescence efficiency of 8.2 cd A⁻¹ in TCTA:DCNSFX, which possesses increases of 1.1 and 3.3 times than those (15% and 1.9 cd A⁻¹) of TCTA:CNSFX, respectively. The relatively favorable performance of TCTA:DCNSFX is related to the stronger electron-accepting ability through dicyano-substitution and larger driving force in the exciplex emission. These appealing results reveal that the dicyano-substituted SFX derivative opens interesting perspectives for developing favorable exciplex-TADF organic light-emitting diodes in the future.

两种氰基取代的螺[氟-9,9'-x吨]（SFX）衍生物，2-腈-螺[芴-9,9'-吨]（CNSFX）和2,7-二腈-螺[芴-9]方便地制备了作为电子受体的9，-x吨]（DCNSFX），并与作为电子供体的三（4-咔唑基-9-基苯基）胺（TCTA）结合形成激基复合物发射体。在TCTA：DCNSFX中成功实现了良好的激基复合物-TADF，其光致发光量子产率为31％，电致发光效率为8.2 cd A ^-1，其增幅为15倍和1.9 cd A ^-1的1.1和3.3倍。）分别为TCTA：CNSFX）。TCTA：DCNSFX的相对较好的性能与通过双氰基取代产生的较强的电子接受能力和激基复合物发射中的较大驱动力有关。这些吸引人的结果表明，二氰基取代的SFX衍生物为将来开发有利的激基复合物-TADF有机发光二极管开辟了有趣的前景。