Enhancement of electroluminescence through a two-dimensional corrugated metal film by grating-induced surface-plasmon cross coupling
Enhancement of electroluminescence through a two-dimensional corrugated metal film by grating-induced surface-plasmon cross coupling
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DOI：
10.1364/ol.30.002302
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发表时间：
2005-09-01
期刊：
影响因子：
3.6
通讯作者：
Okamoto, T
中科院分区：
文献类型：
--
作者：
Feng, J;Okamoto, T
我们报道了通过有机发光器件(OLED)中不透明顶部的金属阴极来增强电致发光，有机发光器件在两个维度上周期性地波纹。这种增强是由表面等离子体的栅致交叉耦合和出耦合引起的。与具有一维波纹金属阴极的OLED相比，在垂直方向观察到的发射强度提高了4倍，并且高于无波纹OLED从透明衬底一侧观察到的发射强度。我们将这种增强归因于这样一个事实，即在所有横向传播的表面等离子体通过有机发光二极管的二维波纹结构耦合到自由空间中。此外，由于捕获在发射层中的波导模的有效耦合，来自透明衬底一侧的发射也大大增强。(C)2005年美国光学学会。
We report enhancement of electroluminescence through opaque-topped metal cathodes in organic light-emitting devices (OLEDs), which are periodically corrugated in two dimensions. The enhancement is caused by grating-induced cross coupling and outcoupling of surface plasmons. The emission intensity observed at normal direction is enhanced by a factor of 4 compared with that of OLEDs with one-dimensionally corrugated metal cathodes and is higher than that observed from the transparent substrate side in uncorrugated OLEDs. We attribute the enhancement to the fact that the surface plasmons propagating in all lateral directions are coupled out into free space by the two-dimensional corrugated structure of the OLEDs. In addition, the emission from the transparent substrate side is also much enhanced owing to the efficient coupling out of the waveguide modes trapped in the emissive layer. (c) 2005 Optical Society of America.