A Mixed Host Emitting Interlayer Based on CBP:TPBi in Green Phosphorescent Organic Light-Emitting Diodes
Yao Xu, Yu-Ting Zhang, Zhi-Qi Kou** , Shuang Cheng, Sheng-Li Bu
College of Science, University of Shanghai for Science and Technology, Shanghai 200093
Abstract ：A series of green phosphorescent organic light-emitting diodes based on bipolar-transporting material 4,4'-bis-(carbazol-9-yl) biphenyl (CBP) are prepared. We insert a mixed host emitting interlayer (CBP$_{x}$: electron-transporting material 1,3,5-tris (N-phenylbenzimidazole-2yl) (TPBi)$_{1-x}$) in the middle of the emitting layer, and the best performance appears when $x$ is 2/3. The position of this interlayer can also affect the performance of phosphorescent organic light-emitting diodes. When this interlayer is close to the side of the electron transporting layer, the maximum value of luminance, the current efficiency and the power efficiency are 34090 cd/m$^{2}$ at 12 V, 60.6 cd/A and 56.6 lm/W, respectively.
收稿日期: 2015-11-22
出版日期: 2016-04-29
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2016, Vol. 33 
