Affiliation:
1. State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 China
2. School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172 Guangdong
Abstract
AbstractThermally activated delayed fluorescence (TADF) materials have been widely studied for the fabrication of high‐performance organic light‐emitting diodes (OLEDs), but the serious efficiency roll‐offs still remain unsolved in most cases. Herein, it is wish to report a series of robust green TADF compounds containing rigid xanthenone acceptor and acridine‐based spiro donors. The enhancement in molecular rigidity not only endows the compounds with improved thermal stability but also results in reduced geometric vibrations and thus lowered reorganization energies. These compounds exhibit distinct merits of high thermal stabilities, excellent photoluminescence quantum efficiencies (96%–97%), large horizontal dipole orientation ratios (87.4%–92.1%) and fast TADF rates (1.4–1.5 × 106 s‒1). The OLEDs using them as emitters furnish superb electroluminescence performances with outstanding external quantum efficiencies (ηexts) of up to 37.4% and very small efficiency roll‐offs. Moreover, highly efficient hyperfluorescence OLEDs are obtained by using them as sensitizers for the green mutilresonance TADF emitter BN2, delivering excellent ηexts of up to 34.2% and improved color purity. These results disclose the high potential of these TADF compounds as emitters and sensitizers for OLEDs.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
Fundamental Research Funds for the Central Universities
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
12 articles.
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