Positional isomerism effect of spirobifluorene and terpyridine moieties of “(A)<sub>n</sub>–D–(A)<sub>n</sub>” type electron transport materials for long-lived and highly efficient TADF-PhOLEDsMengying Bian, Lixin Xiao, Zuqiang Bian et al.|Journal of Materials Chemistry C|2018Cited by 32