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Thermally activated delayed fluorescence dendrimers with exciplex-forming dendrons for low-voltage-driving and power-efficient solution-processed OLEDs

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Abstract

Exciplex-forming hosts have the excellent function of reducing driving voltages by eliminating the injection barrier, while thermally activated delayed fluorescence (TADF) emitters are able to realize 100% internal quantum efficiency. The marriage of exciplex and TADF should be a rational strategy to design ideal luminescent materials. In this study, two new dendrimers G-TCTA and G-mCP with a non-conjugated connection of the well-known efficient TADF core and different exciplex-forming dendrons were designed and synthesized. Both dendrimers possess excellent thermal stability, good solution processability, and an visible TADF feature. The non-conjugated connection can make the photophysical properties of TADF core and the exciplex-forming function of the dendrons independent. Consequently, a nondoped device of G-mCP achieves an extremely low driving voltage of 2.7 V and a high power efficiency of 46.6 lm W−1, which is among the highest power efficiency of the reported TADF s-OLED. We believe that this study would provide a simple and practical method to design novel power-efficient TADF dendrimers used for energy-saving displays and solid-state lightings.

Graphical abstract: Thermally activated delayed fluorescence dendrimers with exciplex-forming dendrons for low-voltage-driving and power-efficient solution-processed OLEDs

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Publication details

The article was received on 17 Oct 2017, accepted on 17 Nov 2017 and first published on 23 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04720G
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Thermally activated delayed fluorescence dendrimers with exciplex-forming dendrons for low-voltage-driving and power-efficient solution-processed OLEDs

    K. Sun, Y. Sun, W. Tian, D. Liu, Y. Feng, Y. Sun and W. Jiang, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04720G

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