Abstract
Herein, a tetracyano-substituted spiro[fluorene-9,9′-xanthene] (SFX) derivative, 2,3′,6′,7-tetracarbonitrile-SFX (TCNSFX) was conveniently synthesized as electron acceptor for combining with tris(4-carbazoyl-9-ylphenyl)amine (TCTA) as electron donor to form exciplex emitter. Subsequently, exciplex-TADF was successfully realized with photoluminescence quantum yield of 29% and electroluminescence efficiency of 6.0 cd A−1 in TCTA:TCNSFX. The exciplex-TADF performance of TCTA:TCNSFX is related to the stronger electron-accepting ability through tetracyano-substitution and large driving force in the exciplex emission. Although the emission efficiencies are slightly low, this work enriches the design system of electron acceptors for exciplex-TADF, simultaneously offering an efficient and convenient approach to developing low-cost materials and devices for TADF.
Original language | English |
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Pages (from-to) | 132-138 |
Number of pages | 7 |
Journal | Journal of Molecular Structure |
Volume | 1196 |
DOIs | |
State | Published - 15 Nov 2019 |
Keywords
- Electron acceptor
- Exciplex
- Organic light-emitting diode
- Spiro[fluorene-9,9′-xanthene]
- Tetracyano-substitution
- Thermally activated delayed fluorescence