Citation: Cao Hongtao, Li Bo, Wan Jun, Yu Tao, Xie Linghai, Sun Chen, Liu Yuyu, Wang Jin, Huang Wei. Cyano-substituted Spiro[fluorine-9, 9'-xanthene] Derivatives: Exciplex Emission and Property Manipulation[J]. Acta Chimica Sinica, ;2020, 78(7): 680-687. doi: 10.6023/A20030097 shu

Cyano-substituted Spiro[fluorine-9, 9'-xanthene] Derivatives: Exciplex Emission and Property Manipulation

  • Corresponding author: Xie Linghai, iamlhxie@njupt.edu.cn Liu Yuyu, iamyyliu@njupt.edu.cn Huang Wei, iamwhuang@njupt.edu.cn
  • † These authors contributed equally to this work
  • Received Date: 31 March 2020
    Available Online: 3 June 2020

    Fund Project: Project supported by the National Natural Science Foundation of China (Nos. 61605090, 61604081, 61604076, 21774061, 91833306), the Natural Science Foundation of Jiangsu Province (BK20190090, BK20180751), the Six Peak Talents Foundation of Jiangsu Province (XCL-CXTD-009) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD, YX030003)National Natural Science Foundation of China 91833306the Six Peak Talents Foundation of Jiangsu Province XCL-CXTD-009National Natural Science Foundation of China 61604081the Natural Science Foundation of Jiangsu Province BK20180751National Natural Science Foundation of China 61604076the Priority Academic Program Development of Jiangsu Higher Education Institutions YX030003the Natural Science Foundation of Jiangsu Province BK20190090National Natural Science Foundation of China 21774061National Natural Science Foundation of China 61605090

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  • Thermally activated delayed fluorescence (TADF) molecules have great potential in developing organic light-emitting diodes (OLEDs) because of their efficient emission and low price. Compared to pure-molecules, exciplex systems are drawing much attention since they can realize small singlet-triplet energy splitting (ΔEST) more easily for TADF. However, the species and molecular design systems of electron-acceptors for exciplex-TADF are still limited even though some acceptors have been reported. In addition, the relationship between TADF properties and the structures of acceptors requires further investigations. Herein, we report the design and synthesis of two novel spiro[fluorine-9, 9'-xanthene]-based acceptors (CNSFDBX and DCNSFDBX) for achieving exciplex-emissions by using tris(4-carbazoyl-9-ylphenyl)amine (TCTA) as a donor. The photoluminescence measurements suggest that both of the doping-systems (TCTA:CNSFDBX and TCTA:DCNSFDBX) possess exciplex emissions. Whereas, it is observed that the TCTA:DCNSFDBX system displays higher photoluminescence quantum yield and electroluminescence efficiency than TCTA:CNSFDBX. For better explaining this phenomenon, we perform low-temperature fluorescence and phosphorescence spectra investigations. The experimental results show that the TCTA:DCNSFDBX system exhibits smaller ΔEST values (0.12 eV) than TCTA:CNSFDBX (0.46 eV). This results indicate that the reverse intersystem crossing from non-radiative triplet states (T1) to radiative singlet states (S1) and TADF processes can be realized more easily in the TCTA:DCNSFDBX system. Moreover, the electrochemical measurements and theoretical calculations suggest that the lowest unoccupied molecular orbital (LUMO) level of DCNSFDBX (-2.86 eV) is lower than that of CNSFDBX (-2.47 eV). This situation implies that DCNSFDBX possesses stronger electron-accepting ability than CNSFDBX with the help of dicyano-substitution. Furthermore, the TCTA:DCNSFDBX system displays larger driving force (0.39 eV) than TCTA:CNSFDBX (0.22 eV) in their exciplex-formation processes, suggesting the exciplex-emission (TCTA:DCNSFDBX) can be achieved more easily. Therefore, the higher exciplex-emission efficiencies of the TCTA:DCNSFDBX system are attributed to the stronger electron-acceptability of DCNSFDBX through dicyano- substitution and larger driving force in its exciplex emission process. This work provides a route to further development of new electron-acceptors for exciplex-TADF.
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