Bipolar fluorophores based on intramolecular charge-transfer moieties of sulfone for nondoped deep blue solution-processed organic light-emitting diodes

Authors：Cao, Liang; Zhang, Lei; Wei, Qiang^*; Zhang, Jiasen; Chen, Dongjun; Wang, Sheng; Su, Shi-jian^*; Wang, Tao^*; Ge, Ziyi^*

Source：Dyes and Pigments, 2020, 176: 108242.

DOI：10.1016/j.dyepig.2020.108242

• Intramolecular charge-transfer
• Bipolar fluorophores
• Deep blue
• Single layer
• Organic light-emitting diodes

Dipolar emitters exhibited excellent performance in organic light-emitting diode (OLED). However, these molecules had intramolecular charge-transfer (ICT) properties, which posed challenge to obtain deep blue emission. In this study, three fluorophores were designed by introducing carbazole and diphenylamine as electron donors and sulfone as electron acceptor due to their mild charge-accepting properties and twisted angles. These materials appeared almost in vertical angles of the dihedral configuration, and exhibited high thermal and electrochemical stability, suitable for solution-processed OLED. The solution-processed non-doped devices based on these three emitters were realized, where two emissions within the standard deep blue emission range were achieved with the Commission International e de l'Eclairage (CIE) coordinates of (0.16, 0.12) and (0.16, 0.15).

• Institution
  中国科学院宁波材料技术与工程研究所; 中国科学院研究生院