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Updated: Jan 29, 2026

Blue-hazard-free Candlelight OLED
Published on: March 19, 2017
C1-Linked Spirobifluorene Dimers: Pure Hydrocarbon Hosts for High-Performance Blue Phosphorescent OLEDs
Lambert J Sicard1, Hong-Cheng Li2, Qiang Wang2
1Univ Rennes, CNRS, ISCR- UMR 6226, 35000, Rennes, France.
Abstract:
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.
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