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Circularly Polarized Electroluminescence from Intrinsically Axial Chiral Materials Based on Bidibenzo[b,d]furan/bidibenzo[b,d]thiophene
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-06-05 , DOI: 10.1002/adfm.202403803
Li Yuan 1 , Yi‐Fan Yang 1 , Zhi‐Ping Yan 1, 2 , Jia‐Jun Hu 1 , Dan Mao 1 , Hua‐Xiu Ni 1 , You‐Xuan Zheng 1
Affiliation  

Herein, by connecting chiral bidibenzo[b,d]furan/bidibenzo[b,d]thiophene and multi-resonance thermally activated delayed fluorescence (MR-TADF) units, two pairs of intrinsically axial chiral MR-TADF materials (R/S-BDBF-BNO and R/S-BDBT-BNO) realize mirror-symmetric circularly polarized luminescence (CPL) and narrowband emission. The chiral moieties effectively engage in frontier molecular orbital distributions through the establishment of covalent bonds with boron atoms. The proportions of (1,1′-bidibenzo[b,d]furan)-2,2′-diol in the highest occupied and lowest unoccupied natural transition orbitals (HONTO/LUNTO) are 25.3% and 64.7%, respectively. In addition, BDBT-BNO processes a dual-channel transition mode, thus the (1,1′-bidibenzo[b,d]thiophene)-2,2′-diol constitutes 22.8%, 24.3% and 54.0%, 46.9% of the distributions of HONTO, HONTO-1 and LUNTO, LUNTO+1, respectively. The high proportions endow R/S-BDBF-BNO and R/S-BDBT-BNO with good CPL properties with dissymmetry factors (|gPL|) of 1.7/1.8 × 10−3. Correspondingly, the circularly polarized organic light-emitting diodes based on the enantiomers exhibit mirror symmetrical circularly polarized electroluminescence with |gEL| factors of 1.5/1.6 × 10−3. Furthermore, the introduction of sulphur atoms enables BDBT-BNO to have a high maximum external quantum efficiency of 35.7% in device.

中文翻译:


基于二苯并[b,d]呋喃/二二苯并[b,d]噻吩的本征轴向手性材料的圆极化电致发光



在此,通过连接手性二苯并[b,d]呋喃/双苯并[b,d]噻吩和多共振热激活延迟荧光 (MR-TADF) 单元,两对本征轴向手性 MR-TADF 材料 (R/S-BDBF-BNOR/S-BBT-BNO) 实现了镜对称圆偏振发光 (CPL) 和窄带发射。手性部分通过与硼原子建立共价键有效地参与前沿分子轨道分布。(1,1′-二苯并[b,d]呋喃)-2,2′-二醇在最高占据和最低未占据的自然过渡轨道 (HONTO/LUNTO) 中的比例分别为 25.3% 和 64.7%。此外,BDBT-BNO 处理双通道过渡模式,因此 (1,1′-二苯并[b,d]噻吩)-2,2′-二醇分别占 HONTO、HONTO-1 和 LUNTO、LUNTO+1 分布的 22.8%、24.3% 和 54.0%、46.9%。高比例赋予 R/S-BDBF-BNOR/S-BDBT-BNO 良好的 CPL 特性和不对称因子 (|gPL|)1.7/1.8 × 10−3。相应地,基于对映异构体的圆极化有机发光二极管表现出镜面对称圆极化电致发光 |gEL|1.5/1.6 的因子× 10−3。此外,硫原子的引入使 BDBT-BNO 在器件中具有 35.7% 的最大外部量子效率。
更新日期:2024-06-05
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