Tri-, Tetra- and Pentamers of 9,9′-Spirobifluorenes through Full<i>ortho</i>-Linkage: High Triplet-Energy Pure Hydrocarbon Host for Blue Phosphorescent Emitter
作者:Cong Fan、Yonghua Chen、Pei Gan、Chuluo Yang、Cheng Zhong、Jingui Qin、Dongge Ma
DOI:10.1021/ol1024184
日期:2010.12.17
4,4'-Dibromo-9,9'-spirobifluorene was first synthesized, and from this intermediate, three fully ortho-linked tri-, tetra-, and pentamers of 9,9'-spirobifluorenes were constructed. The full ortho-linkage impedes the pi conjugation of fluorene units, and guarantees their high triplet energies (Er = 2.80 eV). A device with the trimer as the first pure hydrocarbon host material for blue phosphor Flrpic shows a maximum current efficiency of 25 cd/A.