Department of Chemistry, Molecular Dynamic Chemistry Center, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, School of Science, Tianjin University, Tianjin 300354, China.
Institute of Molecular Sciences and Engineering, Shandong University, Qingdao 266237, China.
J Phys Chem Lett. 2021 Oct 7;12(39):9501-9507. doi: 10.1021/acs.jpclett.1c02642. Epub 2021 Sep 24.
In this work, we present for the first time a general strategy via molecular reversed conformational distortion for thermally activated delayed fluorescence (TADF). A model purely organic compound named BNNIO with a common fluorophore flexibly linked to benzene by an oxygen atom is rationally designed and successfully synthesized. Moreover, the rate constant of reverse intersystem crossing reaches 2.34 × 10 s as determined by transient spectroscopy. As a result, TADF emission of BNNIO is observed with a photoluminescence quantum yield of 90.72% and a lifetime of 84.76 μs at 415 nm. This universal regulation strategy undoubtedly opens a new avenue for the development of novel purely organic blue light-emitting materials.
在这项工作中，我们首次提出了一种通过分子反向构象扭曲实现热激活延迟荧光（TADF）的通用策略。我们合理设计并成功合成了一种名为 BNNIO 的纯有机化合物，该化合物通过一个氧原子将常见的荧光团灵活地连接到苯上。此外，通过瞬态光谱确定反向系间窜越的速率常数高达 2.34×10^-8 s^-1。因此，在 415nm 处观察到 BNNIO 的 TADF 发射，其光致发光量子产率为 90.72%，寿命为 84.76μs。这一通用调控策略无疑为新型纯有机蓝光发射材料的发展开辟了新的途径。
