Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation
Dynamic turn-on behavior of organic light-emitting devices with different work function cathode metals under fast pulse excitation
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DOI：
10.1063/1.1628835
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发表时间：
2003-12-15
影响因子：
3.2
通讯作者：
Taniguchi, Y
中科院分区：
文献类型：
--
作者：
Ichikawa, M;Amagai, J;Taniguchi, Y
研究了不同金属阴极的有机电致发光器件的电致发光特性及其与器件面积的关系。此外，我们制定的EL延迟时间，这是一个指标的EL响应。EL响应基本上由器件面积决定，即，器件的电容，这对于具有低功函数金属作为阴极的OLED是快速的。根据该公式，我们估算了快脉冲激发下有机双层膜中的电子迁移率和电子注入的阈值电场。结果表明，电子在双层膜中的迁移率呈现出各层混合的迁移率特征，阈值电场随阴极金属功函数的减小而减小。低功函数金属阴极器件被认为是一种高速电致发光响应器件。(C)2003年，美国物理学会。
We investigate the electroluminescence (EL) response of organic light-emitting diodes (OLEDs) with different metal cathodes and device-area dependence. Moreover, we formulate the EL delay time, which is an indicator of the EL response. The EL response is fundamentally governed by the device area, i.e., the capacitance of the device, and this for the OLEDs with low work function metals as a cathode is fast. According to the formulation, we estimate electron mobility in an organic bilayer and the threshold electric fields for electron injection under fast-pulse excitation. It is consequently demonstrated that electron mobility in the bilayer showed mixed mobility characteristics for each layer, and the threshold electric field became smaller with a decrease in the work function of cathode metals. The low work function metal cathode device is identified as a high-speed EL response device. (C) 2003 American Institute of Physics.