DataVXAdvanced Optical MaterialsPaper
journal article·2021-05

Efficient Circularly Polarized Electroluminescence from Chiral Thermally Activated Delayed Fluorescence Emitters Featuring Symmetrical and Rigid Coplanar Acceptors

Feng‐Ming Xie, Jing‐Xiong Zhou, Xin‐Yi Zeng, Zhi‐Dong An, Yan‐Qing Li, Dong‐Xue Han, Peng‐Fei Duan, Zheng‐Guang Wu, You‐Xuan Zheng, Jian‐Xin Tang

Advanced Optical Materials· Volume 9· Issue 9
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Source abstract

Abstract

Abstract Circularly polarized organic light‐emitting diodes (CP‐OLEDs) that enable circularly polarized luminescence (CPL) are promising for 3D display and photonic applications. However, the device efficiency and CPL character of CP‐OLEDs still lag behind the practical requirements. Here, two pairs of axially chiral emitting enantiomers, flexible (R/S)‐ODQPXZ and rigid (R/S)‐ODPPXZ, are reported by fusing (R/S)‐octahydro‐binaphthol chiral source, diphenyl quinoxaline (DQ)/dibenzo[a,c]phenazine (DP) acceptors and phenoxazine (PXZ) donors. The symmetrical chiral‐acceptor‐donor configuration endows them thermally activated delayed fluorescence (TADF) properties with small singlet–triplet energy gaps of 0.16 and 0.07 eV, high photoluminescence quantum yields of 92% and 89% in doped films, and obvious mirror‐image CPL characteristics, respectively. The CP‐OLEDs based on these TADF enantiomers not only show a maximum external quantum efficiency of 28.3% with yellow emission for (R/S)‐ODQPXZ and 20.3% with orange‐red emission for (R/S)‐ODPPXZ, but also display the CPL with dissymmetry factors (gEL) of 6.0 × 10−4 and 2.4 × 10−3, respectively. The high efficiency and obvious CPL of (R)‐ODPPXZ arise from a synergetic interplay of the TADF skeleton and the rigid coplanar acceptor for efficient chiral induction and suppressed intramolecular rotational quenching.
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Research context

OpenAlex topics: Synthesis and Properties of Aromatic Compounds · Luminescence and Fluorescent Materials · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Suzhou 215123 China

School of Physics and Electronic Science Ministry of Education Nanophotonics and Advanced Instrument Engineering Research Center East China Normal University Shanghai 200062 China

CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience Nanophotonics Research Division National Center for Nanoscience and Technology (NCNST) No. 11 ZhongGuanCun BeiYiTiao Beijing 100190 P. R. China

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

Macao Institute of Materials Science and Engineering Macau University of Science and Technology Taipa Macau SAR 999078 P. R. China

Funding

National Natural Science Foundation of China · Collaborative Innovation Center of Suzhou Nano Science and Technology

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