Solution-processable through-space charge-transfer emitters via solubilizing groups modification
NPJ FLEXIBLE ELECTRONICS(2022)
摘要
The solubility of luminescent materials is a key parameter to improve the electroluminescent performances of solution-processed organic light-emitting diodes (OLEDs). The through-space charge transfer (TSCT) materials provide an alternative to introduce the solubilizing groups (SGs) to the linker. Herein, the tert -butyl and n- hexyl groups are introduced as SGs at C7 positions of spiro structure, named C6-DMB and tBu-DMB , away from the acceptor. This has no influence on the photophysical properties of the parent TSCT molecule. Highly efficient solution-processed OLEDs were demonstrated with the maximum external quantum efficiencies of 21.0% and 21.7%, respectively. To the best of our knowledge, these are champions in the state-of-the-art solution-processed OLEDs with TSCT emitters. This work confirmed our conjecture of constructing highly efficient soluble emitters by transforming an outstanding TSCT material from thermal evaporation to solution-processed OLEDs with SGs simply integrated on the ‘bridge’ linker.
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关键词
charge-transfer charge-transfer,solution-processable,through-space
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