Influence of capacitance effect on alternating-current organic light-emitting diodes |
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| Authors: | Deang Liu Zheng Xu Shengyi Yang Shanyu Quan Qingfang He Yongsheng Wang Xurong Xu |
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| Affiliation: | The Lab of Materials for Information Storage and Displays, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, People's Republic of China |
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| Abstract: | The capacitance effect on ITO/poly[2-methoxy-5-[(2′-ethylhexyl)oxy]-p-phenylenevinylene] (MEH-PPV)/Al is studied by impedance spectroscopy technology, and the electroluminescence (EL) mechanism of this device driven by a sinusoidal alternating-current (AC) bias is suggested. By calculating the RC time constant of the device, we find that it is in good agreement with the lag-time between the EL and applied AC bias. Also, the influence of operating frequency on the EL intensity of the device is presented and it is concluded that a low operating frequency is good for a high device performance. |
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| Keywords: | 78.60.Fi 73.61.Ph 73.50.Gr 78.66.Qn |
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