Highly Efficient Hole Injection Using Polymeric Anode Materials for Small-Molecule Organic Light-Emitting Diodes

作者：Choudhury Koushik Roy^*; Lee Jaewon; Chopra Neetu; Gupta Alok; Jiang Xuezhong; Amy Fobrice; So Franky

来源：Advanced Functional Materials, 2009, 19(3): 491-496.

DOI：10.1002/adfm.200801368

A novel, highly efficient hole Injection material based on a conducting polymer polythienothiophene (PTT) doped with poly(perfluoroethylene-perfluoroethersulfonic acid) (PFFSA) in organic light-emitting diodes (OLEDs) is demonstrated. Both current-voltage and dark-injection-current transient data of hole-only devices demonstrate high hole-injection efficiency employing PTT-PFFSA polymers with different organic charge-transporting materials used in fluorescent and phosphorescent organic light-emitting diodes. it is further demonstrated that PTT-PFFSA polymer formulations applied as the hole injection layer (HIL) in OLEDs reduce operating voltages and increase brightness significantly. Hole injection from PTT-PFFSA is found to be much more efficient than from typical small molecule HILs such as copper phthalocyanine (CuPc) or polymer HILs such as polyethylene dioxythiophene: polystyrene sulfonate (PEDOT-PSS). OLED devices employing PTT:PFFSA polymer also demonstrate significantly longer lifetime and more stable operating voltages compared to devices using CuPc.

• 出版日期2009-2-10