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

• Published in: Angewandte Chemie International Edition Vol. 58; no. 12; pp. 3848 - 3853
• Main Authors: Sicard, Lambert J., Li, Hong‐Cheng, Wang, Qiang, Liu, Xiang‐Yang, Jeannin, Olivier, Rault‐Berthelot, Joëlle, Liao, Liang‐Sheng, Jiang, Zuo‐Quan, Poriel, Cyril
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 18-03-2019; Wiley-VCH Verlag
• Edition: International ed. in English
• Subjects: Chemical Sciences; Dimers; Diodes; Hydrocarbons; Material chemistry; materials chemistry; Organic light emitting diodes; organic semiconductors; Phosphorescence; Phosphors; pure hydrocarbons; Quantum efficiency; regioisomers; spiro-compounds; organic semiconductors; materials chemistry; spiro-compounds; pure hydrocarbons; regioisomers
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201813604

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.
Phosphorescence with a twist: The highly twisted C1‐linked spiro‐bifluorene dimers are reported. This work shows that the C1‐position enables the design of pure hydrocarbon materials, with a high triplet energy, for hosting blue phosphors in highly efficient phosphorescent OLEDs (PhOLEDs).