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- Title
Highly Efficient Orange‐Red Thermally Activated Delayed Fluorescence Compounds Comprising Dual Dicyano‐Substituted Pyrazine/Quinoxaline Acceptors.
- Authors
Li, Hejun; Yang, Tong; Wang, Jiaxuan; Xie, Ning; Wang, Qingyang; Xu, Yincai; Zhao, Yuguang; Liang, Baoyan
- Abstract
The π‐conjugation of molecules has a large influence on their excited state properties, especially for red thermally activated delayed fluorescence (TADF) materials. Two orange‐red TADF compounds comprising dual dicyano‐substituted pyrazine/quinoxaline acceptors have been designed and synthesized. TPA‐2DCNQ (3,3′‐((phenylazanediyl)bis(4,1‐phenylene))bis(2‐phenylquinoxaline‐6,7‐dicarbonitrile) with extended π‐conjugated quinoxaline as the acceptor exhibits higher photoluminescence quantum yields (ca. 0.67–0.71) in doped films. A smaller energy splitting (ΔEst) between the first singlet excited state and triplet excited state is also achieved, indicating that extending the π‐conjugation of the acceptor rationally is an effective approach to designing highly efficient long‐wavelength TADF materials. Devices with TPA‐2DCNQ as the emitter display maximum external quantum efficiencies (EQEs) of 12.6–14.0 %, which are more than twice those of devices containing TPA‐2DCNPZ (6,6′‐((phenylazanediyl)bis(4,1‐phenylene))bis(5‐phenylpyrazine‐2,3‐dicarbonitrile).
- Subjects
DELAYED fluorescence; PYRAZINES; QUINOXALINES; QUANTUM efficiency; ANTHRACENE derivatives
- Publication
ChemPlusChem, 2021, Vol 86, Issue 1, p95
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.202000703