Supramolecular light-emitting polymers (SLEPs) based on host–guest interactions were developed for solution processed organic electronic devices. The dibenzo-24-crown-8 functionalized blue-emitting conjugated oligomer 1 and green-emitting conjugated oligomer 3 were used as the host materials, and the dibenzylammonium salt functionalized blue-emitting conjugated oligomer 2 was used as the guest material. The resulting linear SLEPs were obtained from the self-organization of the host and guest oligomers, which were confirmed by the nuclear magnetic resonance, viscosity and differential scanning calorimetry studies. Highly fluorescent SLEP nanofibers can be easily obtained by drawing or electron-spinning from the equimolar solution of the host and guest oligomers. The photophysical and electroluminescence properties of the resulting SLEPs were fully investigated. It was found that the SLEPs' emission colors can be well tuned from blue to green with significantly enhanced photoluminescent efficiencies by using 3 as the dopant, which is due to the efficient energy transfer caused by the exciton trapping on narrow band gap host oligomer 3 in the SLEPs. As a result, the designed SLEPs showed comparable electroluminescence device performances to those analogous traditional conjugated polymers. Considering the precisely defined starting monomers and catalyst-free polymerization process for the designed SLEPs, combining the good device performances, the present study provides a promising alternative route to develop solution processed semiconductors for optoelectronic applications.
基于主客体相互作用的超分子发光聚合物(SLEPs)是为溶液加工有机电子器件而开发的。二苯并-24-冠-8官能化蓝发光共轭低聚物1和绿发光共轭低聚物3被用作主材料,二苄基
铵盐官能化蓝发光共轭低聚物2被用作客体材料。由此产生的线性SLEPs是通过主客体低聚物的自组织形成的,并通过核磁共振、黏度和差示扫描量热法研究得到了证实。通过从主客体低聚物的等摩尔溶液中拉丝或电子纺丝,可以很容易地获得高荧光SLEP纳米纤维。对所得SLEPs的光物理和电致发光特性进行了全面研究。研究发现,通过使用3作为掺杂剂,SLEPs的发光颜色可以从蓝色很好地调到绿色,并且光致发光效率显着提高,这是由于SLEPs中窄带隙主低聚物3上的激子捕获引起的有效能量转移。因此,所设计的SLEPs的电致发光器件性能与传统共轭聚合物相当。考虑到所设计的SLEPs的精确定义的起始单体和无催化剂聚合工艺,结合良好的器件性能,本研究为开发用于光电子应用的溶液加工半导体提供了有前景的替代途径。