材料科学
电致发光
准分子
圆极化
单重态
偶极子
光致发光
接受者
跃迁偶极矩
光电子学
发光
手性(物理)
光学
激子
原子物理学
分子物理学
激发态
荧光
纳米技术
物理
凝聚态物理
量子力学
夸克
Nambu–Jona Lasinio模型
手征对称破缺
微带线
图层(电子)
作者
Qing Gu,Zijian Chen,Wenjie Xie,Weidong Qiu,Xiaomei Peng,Yihang Jiao,Mengke Li,Zhe Liu,Guanwei Sun,Yilong Lu,Yiyang Gan,Kunkun Liu,Zujin Zhao,Shi‐Jian Su
标识
DOI:10.1002/adom.202201793
摘要
Abstract Chirality is a magical property that exists in nature universally, ranging from the spin of microscopic electrons to the galaxies. Furthermore, circularly polarized organic electroluminescent materials have promising prospects in improving the brightness of displays, but there are still some problems. At present, most of chiral thermally activated delayed fluorescence small molecules show relatively low circularly polarized luminescence (CPL) dissymmetry factors between 10 −4 and 10 −3 because of the electric dipole‐allowed but magnetic dipole‐forbidden transition of the singlet state. In this work, a promising strategy is reported for constructing chiral exciplex systems with a chiral electron acceptor and a regular achiral donor to achieve high CPL dissymmetry factors in both photoluminescence and electroluminescence. From theoretical calculation results, the exciplex systems possess a large separation of the highest occupied molecular orbital and the lowest unoccupied molecular orbital in donor and acceptor molecules, respectively, which results in comparable electric and magnetic transition dipole moments. The resultant CPL organic light‐emitting diodes based on the exciplex systems as emitters show low turn‐on voltage of 2.4 V, high external quantum efficiencies of 12.7% and 9.3%, and opposite circularly polarized electroluminescence with high dissymmetry factors ( g EL ) of +7.25 × 10 −3 and −9.89 × 10 −3 .
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