Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Angewandte Chemie, 2024-08, Vol.136 (32), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (|gPL|) of 6.8×10−4/8.5×10−4, respectively. Correspondingly, the CP‐OLEDs exhibit good performances with an external quantum efficiency of 30.1 % and |gEL| factors of 1.2×10−3. By using conjugation‐extended bidibenzo[b,d]furan/bidibenzo[b,d]thiophene moieties, two pairs of tetraborated chiral multi‐resonance thermally activated delayed fluorescence enantiomers have been synthesized that show good photophysical and chiroptical properties. The sulfur atoms accelerate the reverse intersystem crossing process. The circularly polarized organic light‐emitting diodes exhibit an external quantum efficiency of 30.1 % with dissymmetry factors of 0.59/1.2×10−3.