| Influences of Injection Barrier and Mobility on Recombination Rate and Zone in OLEDs |
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| 作者姓名： | ZHU Ru-hui LI Hong-jian YAN Ling-ling HU Jin PAN Yan-zhi |
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| 作者单位： | [1]1College of Physics Science and Technology, Central South University, Changsha 410083, CHN [2]Department of Applied Physics, Hunan University, Changsha 410082, CHN |
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| 基金项目： | Excellent Youth Foundation of Hunan Province，Science Foundation for Post-doctorate of China，Science Foundation of Central South University |
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| 摘 要： | The luminous efficiency of organic light-emitting devices depends on the recombination probability of electrons injected at the cathode and holes at the anode. A theoretical model to calculate the distribution of current densities and the recombination rate in organic single layer devices is presented taking into account the charge injection process at each electrode, charge transport and recombination in organic layer. The calculated results indicate that efficient single-layer devices are possible by adjusting the barrier heights at two electrodes and the carrier mobilities. Lowering the barrier heights can improve the electroluminescent（EL） efficiency pronouncedly in many cases, and efficient devices are still possible using an ohmic contact to inject the low mobility carrier, and a contact limited contact to inject the high mobility carrier. All in all, high EL efficiency needs to consider sufficient recombination, enough injected carriers and well transport.
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| 关 键 词： | 有机电致发光装置 机动性 重组率 分布密度 |
| 文章编号： | 1007-0206（2006）02-0085-05 |
| 收稿时间： | 2005-11-24 |
| 修稿时间： | 2005-12-13 |
Influences of Injection Barrier and Mobility on Recombination Rate and Zone in OLEDs |
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| ZHU Ru-hui LI Hong-jian YAN Ling-ling HU Jin PAN Yan-zhi.Influences of Injection Barrier and Mobility on Recombination Rate and Zone in OLEDs[J].Semiconductor Photonics and Technology,2006,12(2):85-89. |
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| Authors: | ZHU Ru-hui LI Hong-jian YAN Ling-ling HU Jin PAN Yan-zhi |
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| Abstract: | The luminous efficiency of organic light-emitting devices depends on the recombination probability of electrons injected at the cathode and holes at the anode. A theoretical model to calculate the distribution of current densities and the recombination rate in organic single layer devices is presented taking into account the charge injection process at each electrode, charge transport and recombination in organic layer. The calculated results indicate that efficient single-layer devices are possible by adjusting the barrier heights at two electrodes and the carrier mobilities. Lowering the barrier heights can improve the electroluminescent(EL) efficiency pronouncedly in many cases, and efficient devices are still possible using an ohmic contact to inject the low mobility carrier, and a contact limited contact to inject the high mobility carrier. All in all, high EL efficiency needs to consider sufficient recombination, enough injected carriers and well transport. |
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| Keywords: | Organic electroluminescence device Mobility Injection barrier Recombination rate |
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