Wang Yu, Lv Zi-Yi, Chen Zi-Xuan, Xing Shuai, Huo Zhong-Zhong, Hong Xian-Fang, Yuan Li, Li Wei, 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.
Mater Horiz. 2024 Sep 30;11(19):4722-4729. doi: 10.1039/d4mh00605d.
Circularly polarized organic light-emitting diodes (CP-OLEDs) hold great potential for naked-eye 3D displays, necessitating efficient chiral luminescent materials with an optimal CP luminescence (CPL) dissymmetry factor (). Herein, we present the first chiral multiple resonance thermally activated delayed fluorescence (MR-TADF) materials containing a phosphorus chiral center by incorporating 5-phenylbenzo[]phosphindole-5-oxide into the -position of two MR-TADF cores. The compounds, NBOPO and NBNPO, exhibit photoluminescence peaks at 462 and 498 nm with narrow full-width at half-maximum values of 25 and 24 nm in toluene, respectively. Notably, (/)-NBOPO and (/)-NBNPO enantiomers display high quantum yields of 87% and 93% and symmetric CPL with || factors of 1.18 × 10 and 4.30 × 10, respectively, in doped films. Moreover, the corresponding CP-OLEDs show impressive external quantum efficiencies of 16.4% and 28.3%, along with symmetric CP electroluminescence spectra with || values of 7.0 × 10 and 1.4 × 10, respectively.
圆偏振有机发光二极管（CP - OLED）在裸眼3D显示方面具有巨大潜力，这就需要具有最佳圆偏振发光（CPL）不对称因子（）的高效手性发光材料。在此，我们通过将5 - 苯基苯并[]磷吲哚 - 5 - 氧化物引入两个多重共振热激活延迟荧光（MR - TADF）核的 - 位，首次提出了含有磷手性中心的手性多重共振热激活延迟荧光（MR - TADF）材料。化合物NBOPO和NBNPO在甲苯中的光致发光峰分别位于462和498 nm，半高宽分别为25和24 nm。值得注意的是，（/） - NBOPO和（/） - NBNPO对映体在掺杂薄膜中分别显示出87%和93%的高量子产率以及对称的CPL，其||因子分别为1.18×10和4.30×10。此外，相应的CP - OLED显示出令人印象深刻的16.4%和28.3%的外量子效率，以及对称的CP电致发光光谱，其||值分别为7.0×10和1.4×10。
