Synthesis and Spectroscopy of Poly(9,9-dioctylfluorene-2,7-diyl-<i>co</i>-2,8-dihexyldibenzothiophene-<i>S,S</i>-dioxide-3,7-diyl)s: Solution-Processable, Deep-Blue Emitters with a High Triplet Energy
作者:Kiran T. Kamtekar、Helen L. Vaughan、Benjamin P. Lyons、Andrew P. Monkman、Shashi U. Pandya、Martin R. Bryce
DOI:10.1021/ma100566p
日期:2010.5.25
previous pF-S copolymers containing non-alkylated S units. The backbone twist restricts formation of the intramolecular charge transfer (ICT) state for low incorporation ratios of S6 units. The triplet energy of these new copolymers increases as the percentage of the S6 unit increases (i.e., 15, 30, 50%: 8 → 9 → 10). The alternating copolymer 10 has a sufficiently high triplet energy (ET 2.46 eV for
聚(9,9-二辛基芴-2,7-二基共-2,8- dihexyldibenzothiophene- S,S二氧化物-3,7-二基)的共聚物(PF-S 6 8 - 10)不同组成的已合成由Suzuki-Miyaura聚合而成。在二苯并噻吩-S,S-二氧化物(S)单元上的己基取代基改善了共聚物的溶解性并增加了骨架中的二面角。这会将发射光深深地转变为蓝色(对于10片胶片,λmax 420 nm),并与以前的包含非烷基化S单元的pF-S共聚物相比,提高了光致发光的量子产率。对于S 6单元的低掺入比例,主链扭曲限制了分子内电荷转移(ICT)状态的形成。这些新型共聚物的三重态能量随S 6单元百分比的增加而增加(即15、30、50%:8→9→10)。交替共聚物10具有足够高的三重态能量(对于磷光的开始为E T 2.46 eV),以容纳绿色磷光铱客体发射体,如在电致发光研究中所证实的那样,其仅显示出客体络合物的发射。