Deep-blue light-emitting polyfluorenes containing spiro[fluorene-9,9′-thioxanthene-<i>S,S</i>
-dioxide] isomers
作者:Feng Peng、Jin Xu、Yuhao Zhang、Ruifeng He、Wei Yang、Yong Cao
DOI:10.1002/pola.28618
日期:2017.6.15
Blue light‐emitting polyfluorenes, PPF‐FSOs and PPF‐SOFs were synthesized via introducing spiro[fluorene‐9,9′‐thioxanthene‐S,S‐dioxide] isomers (2,7‐diyl and 2′,7′‐diyl) (FSO/SOF) into the poly[9,9‐bis(4‐(2‐ethylhexyloxy) phenyl)fluorene‐2,7‐diyl] (PPF) backbone, respectively. With the increasing contents of FSO and SOF moieties, the absorption and PL spectra of PPF‐FSOs show slight red shift, while
蓝色荧光聚芴,PPF-FSO和PPF-SOF是通过引入螺[芴-9,9'-噻吨并S,S合成的-二氧化物]异构体(2,7-二基和2',7'-二基)(FSO / SOF)变成聚[9,9-双(4-(2-乙基己氧基)苯基)芴-2,7-二基](PPF)骨干。随着FSO和SOF部分含量的增加,PPF-FSO的吸收光谱和PL光谱分别显示出轻微的红移,而PPF-SOF的吸收光谱和PL光谱则显示出蓝移。随着PPF-SOF中SOF单位的增加,HOMO和LUMO的水平逐渐降低。聚合物发出的蓝光峰值在430-445 nm左右,并且随着电流密度的变化显示出出色的光谱稳定性。通过在聚合物中引入异构体观察到明显变窄的EL光谱。PPF-SOF的半峰全宽减少了15 nm,导致CIE坐标从(0.16,0.11)变为(0.16,0.08)时发生蓝移。使用ITO / PEDOT:PSS / EML / CsF / Al的设备配置,max)为2