C1-Linked Spirobifluorene Dimers Pure Hydrocarbon Hosts for High-Performance Blue Phosphorescent OLEDs

Lambert J Sicard (1) , Hong-Cheng Li (2) , Qiang Wang (2) , Xiang-Yang Liu (2) , Olivier Jeannin (1) , Joëlle Rault-Berthelot (1) , Liang-Sheng Liao (2) , Zuo-Quan Jiang (2) , Cyril Poriel (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 Soochow University

Reported here are C1-linked spiro-bifluorene dimers. A comprehensive study is carried out to analyze the electronic properties of these highly twisted structures. This work shows that the C1-position enables the design of pure hydrocarbon materials, with a high triplet energy, for hosting blue phosphors in efficient phosphorescent OLEDs (PhOLEDs). To date, this work describes the highest performance of blue PhOLEDs ever reported for pure hydrocarbons (external quantum efficiency of ca. 23 %), thus highlighting the potential of the C1-spirobifluorene scaffold in organic electronics.

Keywords: materials chemistry; organic semiconductors; pure hydrocarbons; regioisomers; spiro-compounds

Domains: Chemical Sciences; Chemical Sciences; Material chemistry

Lambert J Sicard, Hong-Cheng Li, Qiang Wang, Xiang-Yang Liu, Olivier Jeannin, et al.. C1-Linked Spirobifluorene Dimers Pure Hydrocarbon Hosts for High-Performance Blue Phosphorescent OLEDs. Angewandte Chemie International Edition, 2019, 58 (12), pp.3848-3853. ⟨10.1002/anie.201813604⟩. ⟨hal-02050274⟩