Junwei XU, Lei ZHANG^*, Jian ZHONG, and Hui LIN

Key Lab of Display Science and Technology of Sichuan Province, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, People's Republic of China

(Received February 21, 2012; Accepted September 20, 2012)

A thin layer of nickel–chromium (Ni–Cr) alloy was deposited on the Al anode to enhance the performance in top emission organic light emitting diodes (TEOLEDs). Al anode with Ni–Cr alloy layer provided high work function, excellent flexibility and smooth surface. Hole injection was improved by the inserted layer because of lower energy barrier. A series of TEOLEDs with various Ni–Cr alloy layers have been fabricated and investigated. TEOLEDs with proper Ni–Cr alloy layer on flexible substrates exhibited a maximum luminance of 15000 cd/m² at 9.5 V, which is 24 times as high as that of device without decoration of Ni–Cr alloy.

Key words: top emission organic light emitting diode, flexible display, nickel–chromium alloy thin film, aluminum anode, high-luminance

^*E-mail address: Zlei@uestc.edu.cn