Through Space Charge Transfer for Efficient Sky-Blue Thermally Activated Delayed Fluorescence (TADF) Emitter with Unconjugated Connection

Ya Kun Wang, Chen Chao Huang, Hao Ye, Cheng Zhong, Aziz Khan, Sheng Yi Yang, Man Keung Fung, Zuo Quan Jiang, Chihaya Adachi, Liang Sheng Liao

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Through-space charge transfer, which exists in nonconjugation linker based thermally activated delayed fluorescence (TADF) materials, excites chemists to explore more possibilities in organic light-emitting diodes (OLEDs). Herein, an sp3-hybrid carbon-centered donor–σ–acceptor type chromophore, QAFCN, is tentatively developed by exploring bi-acridine based electron-donor, i.e., 5,5-dimethyl-5,9-dihydroquinolino[3,2,1-de]acridine (QA). It is interesting to find that the QA moiety shows downshift in highest occupied molecular orbital because of its deformed geometry, which makes it qualified for sky-blue electroluminescence emission. Together with the blue-shift, enhanced photoluminescence quantum yield and faster reverse intersystem crossing rate are also observed in QAFCN, which can be attributed to the close through-space distance between donor/acceptor. As compared to the ACRFLCN without these special features, QAFCN has obvious TADF property and achieves efficient OLEDs of ≈18% external quantum efficiency.

Original languageEnglish
Article number1901150
JournalAdvanced Optical Materials
Volume8
Issue number2
DOIs
Publication statusPublished - Jan 1 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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