Tetracyano-substituted spiro[fluorene-9,9′-xanthene] as electron acceptor for exciplex thermally activated delayed fluorescence

Hong Tao Cao, Chao Shen Hong, Dan Qing Ye, Li Hui Liu, Ling Hai Xie, Shu Fen Chen, Chen Sun, Sha Sha Wang, Hong Mei Zhang, Wei Huang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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 languageEnglish
Pages (from-to)132-138
Number of pages7
JournalJournal of Molecular Structure
Volume1196
DOIs
StatePublished - 15 Nov 2019

Keywords

  • Electron acceptor
  • Exciplex
  • Organic light-emitting diode
  • Spiro[fluorene-9,9′-xanthene]
  • Tetracyano-substitution
  • Thermally activated delayed fluorescence

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