Determining internal screening electric field of working polymer light emitting diodes
Determining internal screening electric field of working polymer light emitting diodes
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DOI：
10.1063/1.4955126
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发表时间：
2016-07
影响因子：
4
通讯作者：
K. Kanemoto;Takahiro Takahashi;H. Hashimoto
中科院分区：
文献类型：
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作者：
K. Kanemoto;Takahiro Takahashi;H. Hashimoto
本研究提供了一种测定聚合物发光二极管(LED)在工作状态下的内部电场的方法。该方法利用由三角形脉冲偏置产生的斯塔克信号，能够在较宽的电压范围内估计内场。正向偏置下的内场由注入载流子引起的屏蔽效应决定。对LED计算的空间分布表明，电极附近存在由累积载流子形成的强大电场。该方法适用于多种器件，并能促进对器件运行中内场隐蔽作用的理解。
This study provides a method of determining the internal electric field of polymer light emitting diodes (LEDs) in the working condition. The method employs Stark signals induced by triangular shaped pulse biases and enables estimates of the internal field in a broad voltage region. The internal field under forward bias is shown to be determined by the screening effect caused by injected carriers. Spatial distribution calculated for the LED suggests the presence of strong electric field formed by accumulated carriers near the electrodes. The proposed method is applicable to a variety of devices and can promote understanding of veiled roles of internal fields on device operation.