| Numerical investigations on the current conduction in bilayer organic light—emitting devices with ohmic injection of charge carriers |
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| 引用本文： | 彭应全,张福甲,宋长安.Numerical investigations on the current conduction in bilayer organic light—emitting devices with ohmic injection of charge carriers[J].中国物理 B,2003,12(7):796-802. |
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| 作者姓名： | 彭应全 张福甲 宋长安 |
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| 作者单位： | School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China |
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| 基金项目： | Project supported by the National Natural science Foundation of China (Grant No. 60076023) and The Natural Science Foundation of Gansu Province (Grant No. ZS021-A25-003-Z). |
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| 摘 要： | A numerical model for bilayer organic light-emitting diodes (OLEDs) has been developed on the basis of trappedcharge limited conduction. The dependences of the current density on the operation voltage, the thickness andtrap properties of the hole transport layer (HTL) and emission layer (EML) in bilayer OLEDs of the structure an-ode/HTL/EML/cathode have been numerically investigated. It has been found that, for given values of reduced trapdepth, total trap density, and carrier mobility of HTL and EML, there exists an optimum thickness ratio of HTL tothe sum of HTL and EML, by which a maximal current density, and hence maximal quantum efficiency and luminance,can be achieved. The current density decreases quickly with the mean trap density, and decreases nearly exponentiallywith the mean reduced trap depth.
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| 关 键 词： | 有机发光二极管 数值模拟 电传导 OLED 双分子层 有机发光器件 |
| 收稿时间： | 1/8/2003 12:00:00 AM |
Numerical investigations on the current conduction in bilayer organic light-emitting devices with ohmic injection of charge carriers |
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| Peng Ying-Quan,Zhang Fu-Jia and Song Chang-An.Numerical investigations on the current conduction in bilayer organic light-emitting devices with ohmic injection of charge carriers[J].Chinese Physics B,2003,12(7):796-802. |
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| Authors: | Peng Ying-Quan Zhang Fu-Jia and Song Chang-An |
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| Affiliation: | School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | A numerical model for bilayer organic light-emitting diodes (OLEDs) has been developed on the basis of trapped charge limited conduction. The dependences of the current density on the operation voltage, the thickness and trap properties of the hole transport layer (HTL) and emission layer (EML) in bilayer OLEDs of the structure anode/HTL/EML/cathode have been numerically investigated. It has been found that, for given values of reduced trap depth, total trap density, and carrier mobility of HTL and EML, there exists an optimum thickness ratio of HTL to the sum of HTL and EML, by which a maximal current density, and hence maximal quantum efficiency and luminance, can be achieved. The current density decreases quickly with the mean trap density, and decreases nearly exponentially with the mean reduced trap depth. |
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| Keywords: | numerical simulation organic light-emitting diodes current conduction |
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