Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region |
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| Authors: | Bai Juan-Juan a Wu Xiao-Ming a Hua Yu-Lin a Mu Xue a Bi Wen-Tao a Su Yue-Ju a Jiao Zhi-Qiang a Shen Li-Ying a Yin Shou-Gen a and Zheng Jia-Jin |
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| Affiliation: | b) a) Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China b) College of Optoelectronics Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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| Abstract: | We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode (OLED) by using the charge control layers (CCLs) based on Alq3 . The CCLs that are inserted into the emitting layers (EMLs) could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm2 , which is about 2.19 times higher than that of the control device (CD) without the CCL, and the maximal luminance is 19.660 cd/m2 at 12V. The device shows a good color stability though the green light emitting material Alq3 is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq3 species. |
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| Keywords: | organic light-emitting devices charge control layer current efficiency |
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