Micro Organic Light Emitting Diode Arrays by Patterned Growth on Structured Polypyrrole
Jianping Li, Yun Hu, Xianhu Liang, Jianmei Chen, Liubiao Zhong, Liang‐Sheng Liao, Lin Jiang, Harald Fuchs, Wenchong Wang, Yandong Wang, Lifeng Chi
Abstract
Abstract Patterning organic light emitting diodes (OLEDs) with several micrometers resolution is of importance in applications such as micro displays, virtual and augmented reality devices. Here a fabrication method of micro OLEDs is reported, using conducting polymer polypyrrole (PPy) as nucleation layer. The photolithographically patterned PPy films are used for patterned growth of hole transport layer to locally confine carrier injection. High‐resolution red, green, and blue micro OLED arrays are demonstrated. The green micro OLEDs with stacked structure of Al/Alq 3 /NPB/PPy/ITO exhibit a maximum current efficiency of 3.41 cd A −1 , which is 80% in comparison to those devices on indium tin oxide glass.