A soluble nonionic surfactant as electron injection material for high-efficiency inverted bottom-emission organic light emitting diodes

Tao Xiong; Fengxia Wang; Xianfeng Qiao; Dongge Ma
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123310
Academic Journal
A soluble nonionic surfactant, polyethylenimine 80% ethoxylated (PEIE) solution, was used as the electron injection material in inverted bottom-emission organic light emitting diodes (OLEDs). The transparent PEIE film was formed on indium-tin-oxide cathode by simple spin-coating method and it was found that the electron injection was greatly enhanced. The devices with PEIE electron injection layer had achieved significant enhancement in luminance and efficiency. The maximum luminance reached 47 000 cd/m2, and the maximum luminance efficiency and power efficiency arrived at 19.7 cd/A and 10.6 lm/W, respectively. Our results indicate that PEIE is a promising electron injection material to realize high performance OLEDs.


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