A Macrospirocyclic Carbazole-Fluorene Oligomer as a Solution-Processable Matrix Host Material for Blue Phosphorescent Organic Light-Emitting Diodes with Low Turn-On Voltage and Efficiency Roll-Off

Nengquan Li, Zhaokang Fan, Yayun Fang, Le Li, Yiwu Quan, Qingmin Chen, Shanghui Ye, Quli Fan, Wei Huang