Electrophosphorescent fluorene copolymers

CHART 4.25 Chemical structure of electrophosphorescent fluorene copolymers where the holetransporting carbazole units have been introduced in the polymer backbone. 

Later, Yang and coworkers [84] reported similar electrophosphorescent fluorene copolymers 71 and 72, where the hole-transporting carbazole units have been introduced in the polymer backbone (Chart 4.25). Optimizing the polymer structure (comonomer ratio) and the device structure (blending with electron-transporting material PBD 8), the EQE of 4.9% has been achieved. 

J Jiang, C Jiang, W Yang, H Zhen, F Huang, and Y Cao, High-efficiency electrophosphorescent fluorene-alt-carbazole copolymers IV-grafted with cylometalated Ir complexes, Macromolecules, 38 4072 1080, 2005. 

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