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

作者：Zhang, Gang; Gao, Hongyan; Zhao, Lina; Gao, Yonghui; Kang, Zhijie; Tian, Xiaocui; Wang, Jin; Dong, Weili; Zhang, Xiyan; Jiang, Wenlong^*

来源：Journal of Materials Science: Materials in Electronics , 2015, 26(9): 6506-6510.

DOI：10.1007/s10854-015-3245-3

• DIODES
• ELECTROLUMINESCENCE
• BLUE

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/m(2) 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.

• 出版日期2015-9
• 单位长春理工大学; 吉林师范大学