摘要
Tetraphenylethene (TPE) is a popular luminogen characterized by aggregation-induced emission and has been widely used to construct solid-state emissive materials. In this work, two thermally stable polymers (P1 and P2) consisting of TPE conjugated to the 2,7-positions of fluorene and carbazole, respectively, are synthesized and characterized. Both polymers are weakly fluorescent in solutions but show greatly enhanced emission as the aggregate formation, presenting an aggregation-enhanced emission feature. Two kinds of polymer light-emitting diodes are fabricated utilizing P1 and P2 as emitters (EML) (device I: ITO/PEDOT:PSS (45 nm)/PVK:EML (1:1 wt%, 55 nm)/TPBI (38 nm)/Ca:Ag; device II: ITO/PEDOT:PSS (45 nm)/ PVK:OXD-7:EML (3:1:3 wt%, 55 nm)/TPBI (38 nm)/Ca:Ag). The device II of P2 shows the best performances, affording a maximum luminance of 6500 cd/m 2 and a high peak efficiency of 2.11 cd/A.
Tetraphenylethene （TPE） is a popular luminogen characterized by aggregation-induced emission and has been widely used to construct solid-state emissive materials. In this work, two thermally stable polymers （P1 and P2） consisting of TPE conjugated to the 2,7-positions of fluorene and carbazole, respectively, are synthesized and characterized. Both polymers are weakly fluorescent in solutions but show greatly enhanced emission as the aggregate formation, presenting an aggregation-enhanced emission feature. Two kinds of polymer light-emitting diodes are fabricated utilizing P1 and P2 as emitters （EML） （device I： ITO/PEDOT：PSS （45 nm）/PVK：EML （1：1 wt%, 55 nm）/TPBI （38 nm）/Ca：Ag; device II： ITO/PEDOT：PSS （45 nm）/ PVK：OXD-7：EML （3：1：3 wt%, 55 nm）/TPBI （38 nm）/Ca：Ag）. The device II of P2 shows the best performances, affording a maximum luminance of 6500 cd/m 2 and a high peak efficiency of 2.11 cd/A.
基金
the National Natural Science Foundation of China (51273053, 21104012, 21284034 and 61106017)
the Natural Science Foundation of Zhejiang Province (Y4110331)
the Program for Changjiang Scholars and Innovative Research Teams in Chinese Universities (IRT 1231)
the Project of Zhejiang Key Scientific and Technological Innovation Team (2010R50017)
