2″-ter(9,9-dihexylfluorene) (F3), and 7-(9H-carbazole-9-yl)-7″′-(4-cyanophenyl)-2,2′:7′,2″:7″,2″′-quarter(9,9-dihexylfluorene) (F4) were synthesized and characterized. Their onset decomposition temperatures for the thermal bond cleavage and the glass-transition temperatures were in general increased with increasing number of fluorene units. In dilute toluene solution, the oligofluorenes exhibited main
一系列新型的低聚
芴基推挽式蓝色发光功能材料,即2-(9 H-
咔唑-9-基)-7-(4-
氰基苯基)-
9,9-二己基芴(F1), 7-(9 H-
咔唑-9-基)-7'-(4-
氰基苯基)-2,2'-双(
9,9-二己基芴)(F2),7-(9 H-
咔唑-9-基)-7“-(4-
氰基苯基)-2,2':7',2” -ter(
9,9-二己基芴)(F3)和7-(9 H-
咔唑-9-基)-7“ ′-(4-
氰基苯基)-2,2':7',2″:7″,2″′-四分(
9,9-二己基芴)(F4)进行合成和表征。随着
芴单元数目的增加,它们的热键断裂的起始分解温度和
玻璃化转变温度通常增加。在稀
甲苯溶液中,寡聚
芴在343-370纳米,光致发光最大值从403至410nm的范围内显示出主要吸收峰,和绝对量子产率(Φ PL的高于87%S)。相反,这些化合物在薄膜中的吸收光谱与溶液中的吸收光谱没有很大差异,除了轻微的峰红移(2-8 nm)。