Abstract
The inception and harnessing of excitons are paramount for the electroluminescence performance of organic light-emitting devices (OLEDs). Through-space charge transfer (TSCT) via intramolecular interaction has proved to be one of the most potent techniques employed to achieve 100% internal quantum efficiency. However, molecular strategies utilized to comprehensively enhance the electroluminescent performance of TSCT emitters regarding improving the photoluminescence quantum yield (PLQY) and elevating the light out-coupling efficiency remain arduous. To surmount this challenge, we deliberately designed and synthesized a proof-of-concept TSCT emitter called CzO-TRZ by incorporating an extra carbazole donor into spiro-heterocyclic architecture. The introduction of rigid spiral fragments can immensely boost the horizontal orientation dipole ratio and establish an extra through-bond charge transfer (TBCT) radiative decay channel. As a result, a very high PLQY of 98.7%, fast kRISC of 2.2×105 s−1 and high krs of 2.2×107 s−1, and an ultrahigh horizontal dipolar ratio of 90% were concurrently achieved for CzO-TRZ blended films. Furthermore, corresponding thermally activated delayed fluorescence (TADF)- and TADF-sensitized fluorescence (TSF)-OLEDs based on CzO-TRZ demonstrated external quantum efficiencies (EQEs) of 33.4% and 30.3%, respectively, highlighting its versatile applications as both an emitter and sensitized host.
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Acknowledgements This work was supported by the National Natural Science Foundation of China (U21A20331, 51773212, 81903743, 52003088), the Distinguished Young Scholars (21925506) and the Ningbo Key Scientific and Technological Project (2022Z124, 2022Z119).
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Highly efficient Through-space Charge Transfer TADF Molecule Employed in TADF- and TADF-sensitized Organic Light-emitting Diodes
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Zhang, J., Li, D., Li, W. et al. Highly efficient through-space charge transfer TADF molecule employed in TADF- and TADF-sensitized organic light-emitting diodes. Sci. China Chem. 67, 1270–1276 (2024). https://doi.org/10.1007/s11426-023-1894-1
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DOI: https://doi.org/10.1007/s11426-023-1894-1