| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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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
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| Cite this article: |
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Yao Xu, Yu-Ting Zhang, Zhi-Qi Kou et al 2016 Chin. Phys. Lett. 33 048501 |
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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.
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Received: 22 November 2015
Published: 29 April 2016
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