We report the synthesis and characterization of a thermally crosslinkable hole-transporting poly(indenofluorene-co-triphenylamine) copolymer (X-IFTPA) containing a vinyl-functionalized triphenylamine moiety. This copolymer exhibited an exothermal peak at 125 °C in the first heating/cooling cycle of a differential scanning calorimetry study, indicating that crosslinking occurred. The highest occupied molecular orbital energy level of this copolymer was estimated to be −5.30 eV, as determined by cyclic voltammetry measurement. Flat and uniform films were formed by spin casting X-IFTPA from chlorobenzene solution. Crosslinking can be finished by thermally annealing the film at 150 °C for 24 min, which can be confirmed by reflectance Fourier transform infrared spectroscopy and UV–Vis absorption spectra. Multi-layer polymer light-emitting diodes (PLEDs) incorporating X-IFTPA as the hole transport layer and a green-light-emitting copolymer as the emissive layer exhibited enhanced luminous efficiency relative to that of a control device without a hole transport layer. Thus, the developed cross-linkable copolymer X-IFTPA is a promising material for the construction of efficient PLEDs.

我们报告热交联空穴传输聚（indenofluorene-的合成与表征合作-三苯胺）共聚物（X-IFTPA），其包含乙烯基官能化的三苯胺部分。在差示扫描量热研究的第一个加热/冷却循环中，该共聚物在125°C时出现放热峰，表明发生了交联。通过循环伏安法测定，该共聚物的最高占据分子轨道能级估计为-5.30 eV。通过从氯苯溶液中旋铸X-IFTPA形成平整均匀的薄膜。可以通过在150°C下将薄膜热退火24分钟来完成交联，这可以通过反射傅立叶变换红外光谱和UV-Vis吸收光谱来确认。相对于没有空穴传输层的控制装置，以X-IFTPA作为空穴传输层并以绿色发光共聚物作为发光层的多层聚合物发光二极管（PLED）显示出增强的发光效率。因此，开发的可交联共聚物X-IFTPA是用于构建高效PLED的有前途的材料。