| Luminescent Efficiency in Single-layer Organic Electrophosphorescent Devices |
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| 作者姓名： | OU Yang-jun LI Hong-jian DAI Xiao-yu |
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| 作者单位： | [1]College of Physics 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（03JJY1008） ; Science Foundation for Post-doctorate of China （2004035083）; Science Foundation of Central South University（0601059）. |
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| 摘 要： | Based on the charge injection and recombination processes and the triplet-triplet annihilation process, a model to calculate the electro.luminescent（EL） efficiency is presented. The influences of the applied electric field on the injection efficiency, recombination efficiency and electroluminescent efficiency are discussed. It is found that： （1） The injection efficiency is increasing while the recombination efficiency is decreasing with the applied electric field increasing. （2） The EL efficiency is enhanced at low electric field slowly but is decreasing at high electric field with the increase of applied voltage. （3） The EL efficiency is decreasing with the increase of the host-guest molecular distance （R）. So, it is concluded that the EL efficiency in single-layer organic electrophosphorescent devices is dominated by injection efficiency at lower electric field and recombination efficiency at higher electric field.
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| 关 键 词： | 注入效率 重组效率 能量转移概率 电磷光效率 |
| 文章编号： | 1007-0206（2006）04-0245-05 |
| 收稿时间： | 2006-06-17 |
| 修稿时间： | 2006-06-22 |
Luminescent Efficiency in Single-layer Organic Electrophosphorescent Devices |
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| OU Yang-jun LI Hong-jian DAI Xiao-yu.Luminescent Efficiency in Single-layer Organic Electrophosphorescent Devices[J].Semiconductor Photonics and Technology,2006,12(4):245-249,261. |
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| Authors: | OU Yang-jun LI Hong-jian DAI Xiao-yu |
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| Abstract: | Based on the charge injection and recombination processes and the triplet-triplet annihilation process, a model to calculate the electroluminescent(EL) efficiency is presented. The influences of the applied electric field on the injection efficiency, recombination efficiency and electroluminescent efficiency are discussed. It is found that: (1) The injection efficiency is increasing while the recombination efficiency is decreasing with the applied electric field increasing. (2) The EL efficiency is enhanced at low electric field slowly but is decreasing at high electric field with the increase of applied voltage. (3) The EL efficiency is decreasing with the increase of the host-guest molecular distance (R). So, it is concluded that the EL efficiency in single-layer organic electrophosphorescent devices is dominated by injection efficiency at lower electric field and recombination efficiency at higher electric field. |
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| Keywords: | Injection efficiency Recombination efficiency Energy transfer probability Electrophosphorescence efficiency |
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