The Study of Hole Injection in OLEDs with Ultra-Thin Sol-Gel TiO2 Layer
Organic light-emitting diodes (OLEDs) with inserting an ultrathin sol–gel titanium oxide (TiO2) buffer layer between the ITO anode and hole transport layer (HTL) were fabricated. The carrier injection and the device efficiency were affected by surface morphology of TiO2, which was changed by different plasma pre-treatment of ITO. Treated by CF4 plasma, the TiO2 layer is the smoothest, and treated by H2 plasma it is like island. The TiO2 layer like island is favor of carrier injection from the anode, which was attributed to the point discharged.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Y. W. Hu et al., "The Study of Hole Injection in OLEDs with Ultra-Thin Sol-Gel TiO2 Layer", Advanced Materials Research, Vols. 189-193, pp. 42-46, 2011