Yuan Li, Xu Jun-Wei, Yan Zhi-Ping, Yang Yi-Fan, Mao Dan, Hu Jia-Jun, Ni Hua-Xiu, Li Cheng-Hui, Zuo Jing-Lin, Zheng You-Xuan
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Jihua Laboratory, Foshan, 528200, P. R. China.
Angew Chem Int Ed Engl. 2024 Aug 5;63(32):e202407277. doi: 10.1002/anie.202407277. Epub 2024 Jul 4.
Chiral multi-resonance thermally activated delayed fluorescence (CP-MR-TADF) materials hold promise for circularly polarized organic light-emitting diodes (CP-OLEDs) and 3D displays. Herein, we present two pairs of tetraborated intrinsically axial CP-MR-TADF materials, R/S-BDBF-BOH and R/S-BDBT-BOH, with conjugation-extended bidibenzo[b,d]furan and bidibenzo[b,d]thiophene as chiral sources, which effectively participate in the distribution of the frontier molecular orbitals. Due to the heavy-atom effect, sulfur atoms are introduced to accelerate the reverse intersystem crossing process and increase the efficiency of molecules. R/S-BDBF-BOH and R/S-BDBT-BOH manifest ultra-pure blue emission with a maximum at 458/459 nm with a full width at half maximum of 27 nm, photoluminescence quantum yields of 90 %/91 %, and dissymmetry factors (|g|) of 6.8×10/8.5×10, respectively. Correspondingly, the CP-OLEDs exhibit good performances with an external quantum efficiency of 30.1 % and |g| factors of 1.2×10.
手性多共振热激活延迟荧光（CP-MR-TADF）材料在圆偏振有机发光二极管（CP-OLED）和3D显示方面具有应用前景。在此，我们展示了两对四硼酸化的固有轴向CP-MR-TADF材料，R/S-BDBF-BOH和R/S-BDBT-BOH，它们以共轭扩展的联苯并[b,d]呋喃和联苯并[b,d]噻吩作为手性源，有效地参与了前沿分子轨道的分布。由于重原子效应，引入硫原子以加速反向系间窜越过程并提高分子效率。R/S-BDBF-BOH和R/S-BDBT-BOH表现出超纯蓝色发射，最大发射波长在458/459 nm，半高宽为27 nm，光致发光量子产率分别为90%/91%，不对称因子（|g|）分别为6.8×10/8.5×10。相应地，CP-OLED表现出良好的性能，外部量子效率为30.1%，|g|因子为1.2×10。
