用于高效圆偏振有机发光二极管且效率滚降低的手性螺轴诱导蓝色热激活延迟荧光材料。
Chiral Spiro-Axis Induced Blue Thermally Activated Delayed Fluorescence Material for Efficient Circularly Polarized OLEDs with Low Efficiency Roll-Off.
作者信息
Zhang Yi-Pin, Liang Xiao, Luo Xu-Feng, Song Shi-Quan, Li Si, Wang Yi, Mao Zhi-Ping, Xu Wen-Ye, Zheng You-Xuan, Zuo Jing-Lin, Pan Yi
机构信息
State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2021 Apr 6;60(15):8435-8440. doi: 10.1002/anie.202015411. Epub 2021 Mar 4.
A spiro-axis skeleton not only introduces circularly polarized luminescence (CPL) into thermally activated delayed fluorescence (TADF) molecules but also enhances the intramolecular through space charge transfer (TSCT) process. Spiral distributed phenoxazine and 2-(trifluoromethyl)-9H-thioxanthen-9-one-10,10-dioxide act as donor and acceptor units, respectively. The resulting TADF enantiomers, (rac)-OSFSO, display emission maxima at 470 nm, small singlet-triplet energy gap (ΔE ) of 0.022 eV and high photoluminescence quantum yield (PLQY) of 81.2 % in co-doped film. The circularly polarized OLEDs (CP-OLEDs) based on (R)-OSFSO and (S)-OSFSO display obvious circularly polarized electroluminescence (CPEL) signals with dissymmetry factor up to 3.0×10 and maximum external quantum efficiency (EQE ) of 20.0 %. Moreover, the devices show remarkably low efficiency roll-off with an EQE of 19.3 % at 1000 cd m (roll-off ca. 3.5 %), which are among the top results of CP-OLEDs.
螺轴骨架不仅能将圆偏振发光（CPL）引入热激活延迟荧光（TADF）分子中，还能增强分子内的空间电荷转移（TSCT）过程。螺旋分布的吩恶嗪和2-（三氟甲基）-9H-噻吨-9-酮-10,10-二氧化物分别作为供体和受体单元。所得的TADF对映体（rac）-OSFSO在共掺杂薄膜中，发射峰位于470 nm，单线态-三线态能隙（ΔE）小至0.022 eV，光致发光量子产率（PLQY）高达81.2%。基于（R）-OSFSO和（S）-OSFSO的圆偏振有机发光二极管（CP-OLED）显示出明显的圆偏振电致发光（CPEL）信号，不对称因子高达3.0×10，最大外量子效率（EQE）为20.0%。此外，这些器件在1000 cd m时的效率滚降非常低，EQE为19.3%（滚降约3.5%），这是CP-OLED的顶尖结果之一。
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