Borane-based complexes have attracted considerable attention as thermally activated delayed fluorescence (TADF) emitters because of their thermal stability, high fluorescence efficiency, and favourable carrier mobility. In this work, we provide a facile way for borylated compounds to enable the spatially adjacent electron donor and acceptor groups to form a near-orthogonal configuration, generating an extremely small energy gap between triplet and singlet excited states (ΔE_ST, ∼30 meV). We demonstrate here a new series of donor-acceptor-donor borylated compounds using functional acridan derivatives as the electron donors and dimesitylborane as the acceptor moieties, which easily generates an intramolecular charge transfer upon excitation. All compounds achieved strong TADF emission and were used as dopants to fabricate TADF OLEDs. Yellow-emitting devices A and B yielded maximum efficiencies of 7.6% (22.2 cd/A) and 10.1% (32.2 cd/A), respectively. Moreover, the green-emitting device C achieved a maximum efficiency of 19.3% (56.8 cd/A) and subsequently dropped to 18.2% (53.6 cd/A) at luminance levels of 10² cd/m². Overall, the high electroluminescent (EL) efficiencies, together with mitigated efficiency roll-off, illustrate that these compounds have a high potential for EL applications.

基于硼烷的配合物由于具有热稳定性，高荧光效率和良好的载流子迁移性，已成为热活化延迟荧光（TADF）发射体引起了相当大的关注。在这项工作中，我们为硼化化合物提供了一种简便的方法，以使空间上相邻的电子供体和受体基团形成近乎正交的构型，从而在三重态和单重态激发态之间产生极小的能隙（ΔE _ST，〜30 meV）。我们在这里展示了一系列新的供体-受体-供体硼化的化合物，它们使用功能性的cri啶衍生物作为电子供体，将二甲基三硼烷作为受体部分，在激发时容易产生分子内电荷转移。所有化合物均实现了强大的TADF发射，并被用作制造TADF OLED的掺杂剂。发出黄色光的设备A和B的最大效率分别为7.6％（22.2 cd / A）和10.1％（32.2 cd / A）。此外，绿色发光装置C在10 ²  cd / m ^2的亮度水平下实现了最大效率19.3％（56.8 cd / A），然后降至18.2％（53.6 cd / A）。。总体而言，高电致发光（EL）效率以及缓解的效率下降现象表明，这些化合物在EL应用中具有很高的潜力。