Tetraborated Intrinsically Axial Chiral Multi‐resonance Thermally Activated Delayed Fluorescence Materials

• DOI: 10.1002/anie.202407277
• Publication Date: 2024-05-23T15:09:48Z
• Authors: Li Yuan; Jun‐Wei Xu; Zhi‐Ping Yan; Yi‐Fan Yang; Dan Mao; Jia‐Jun Hu; Hua‐Xiu Ni; Cheng‐Hui Li; Jing‐Lin Zuo; You‐Xuan Zheng
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract 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 BDBT‐BOH , with conjugation‐extended bidibenzo[ b,d ]furan ]thiophene as chiral sources, which effectively participate in the distribution frontier molecular orbitals. Due to heavy‐atom effect, sulfur atoms are introduced accelerate reverse intersystem crossing process increase efficiency molecules. manifest ultra‐pure blue emission a maximum at 458/459 nm full width half 27 nm, photoluminescence quantum yields 90 %/91 %, dissymmetry factors (| g PL |) 6.8×10 −4 /8.5×10 respectively. Correspondingly, CP‐OLEDs exhibit good performances an external 30.1 % | EL 1.2×10 −3 .