Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784, Korea.
ChemSusChem. 2011 Mar 21;4(3):363-8. doi: 10.1002/cssc.201000338. Epub 2011 Jan 24.
It is a great challenge to develop solution-processed, polymeric hole-injection layers (HILs) that perform better than small molecular layers for realizing high-performance small-molecule organic light-emitting diodes (SM-OLEDs). We have greatly improved the injection efficiency and the current efficiency of SM-OLEDs by introducing conducting polymer compositions composed of polyaniline doped with polystyrene sulfonate and perfluorinated ionomer (PFI) as the HIL. During single spin-coating of conducting polymer compositions, the PFI layer was self-organized at the surface and greatly increased the film work function. It enhanced hole-injection efficiency and current efficiency by introducing a nearly ohmic contact and improving electron blocking. Our results demonstrate that solution-processed polyaniline HILs with tunable work functions are good candidates for reducing process costs and improving OLED performance.
开发出性能优于小分子层的溶液处理聚合物空穴注入层（HIL）对于实现高性能小分子有机发光二极管（SM-OLED）来说是一项巨大的挑战。通过引入由聚苯乙烯磺酸盐掺杂的聚苯胺和全氟离子聚合物（PFI）组成的导电聚合物组合物作为 HIL，我们极大地提高了 SM-OLED 的注入效率和电流效率。在单旋涂导电聚合物组合物期间，PFI 层在表面自组织，并大大增加了薄膜的功函数。它通过引入近乎欧姆接触和改善电子阻挡来提高空穴注入效率和电流效率。我们的结果表明，具有可调功函数的溶液处理聚苯胺 HIL 是降低工艺成本和提高 OLED 性能的良好候选材料。
