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Novel Cs2CO3:Ag2O electron injection layer for high-efficiency organic light-emitting devices

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Abstract

Highly efficient organic light-emitting devices containing a novel composite electron injection layer (Cs2CO3:Ag2O) were fabricated for this study. Compared with the maximum current efficiency and luminance of the control device with a 1 nm Cs2CO3 structure, a maximum current efficiency of 6.45 cd/A and a maximum luminance of 23,320 cd/m2 were obtained, at a Ag2O mass fraction of 20 % and a Cs2CO3:Ag2O layer thickness of 2 nm, which is an increase by a factor of 1.80 and 2.36, respectively. The reason for the high performance can be attributed to the effective reduction of the electron injection barrier at the cathode/organic layer interface by the Cs2CO3:Ag2O electron injection layer, facilitating electron injection. In addition, it is found that the electrical conductivity was increased as well by a factor of 2.54 (1.6 s/m for the Cs2CO3:Ag2O (20 %) layer and 0.63 s/m for the 1 nm Cs2CO3 layer), indicating that the good device performance partly originated from the high electrical conductivity.

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Acknowledgments

This work is supported by the national natural science foundation of China under Grant (No. 50772016), the “Twelfth five-year” science and technology research project of jilin province department of education under Grant (No. 2013208) and the graduate student innovation fund project of Jilin normal university under Grant (No. 2013032).

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Authors and Affiliations

  1. Key Laboratory on Functional Materials Physics and Chemistry of Ministry of Education of China, College of Information Technology, Jilin Normal University, Siping, 136000, China

    Gang Zhang, Hongyan Gao, Lina Zhao, Yonghui Gao, Zhijie Kang, Xiaocui Tian, Jin Wang & Wenlong Jiang

  2. School of Material Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China

    Gang Zhang, Weili Dong & Xiyan Zhang

Authors
  1. Gang Zhang
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  2. Hongyan Gao
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  3. Lina Zhao
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  4. Yonghui Gao
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  5. Zhijie Kang
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  6. Xiaocui Tian
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  7. Jin Wang
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  8. Weili Dong
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  9. Xiyan Zhang
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  10. Wenlong Jiang
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Correspondence to Wenlong Jiang.

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Zhang, G., Gao, H., Zhao, L. et al. Novel Cs2CO3:Ag2O electron injection layer for high-efficiency organic light-emitting devices. J Mater Sci: Mater Electron 26, 6506–6510 (2015). https://doi.org/10.1007/s10854-015-3245-3

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  • DOI: https://doi.org/10.1007/s10854-015-3245-3

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