Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.
Institute of Physics, University of Augsburg , Universitätsstr. 1, 86135 Augsburg, Germany.
ACS Appl Mater Interfaces. 2016 Feb 3;8(4):2666-72. doi: 10.1021/acsami.5b10717. Epub 2016 Jan 25.
In this study, we present a simple method to tune and take advantage of microcavity effects for an increased fraction of outcoupled light in solution-processed organic light emitting diodes. This is achieved by incorporating nonscattering polymer-nanoparticle composite layers. These tunable layers allow the optimization of the device architecture even for high film thicknesses on a single substrate by gradually altering the film thickness using a horizontal dipping technique. Moreover, it is shown that the optoelectronic device parameters are in good agreement with transfer matrix simulations of the corresponding layer stack, which offers the possibility to numerically design devices based on such composite layers. Lastly, it could be shown that the introduction of nanoparticles leads to an improved charge injection, which combined with an optimized microcavity resulted in a maximum luminous efficacy increase of 85% compared to a nanoparticle-free reference device.
在这项研究中，我们提出了一种简单的方法来调整和利用微腔效应，以增加溶液处理有机发光二极管中出光的比例。这是通过加入无散射的聚合物-纳米粒子复合层来实现的。这些可调谐层允许通过使用水平浸渍技术逐渐改变薄膜厚度，即使在单个衬底上的高薄膜厚度下也能优化器件结构。此外，还表明光电设备参数与相应层堆叠的传输矩阵模拟吻合良好，这为基于此类复合层的设备的数值设计提供了可能性。最后，结果表明纳米粒子的引入可以改善电荷注入，结合优化的微腔，与无纳米粒子的参考器件相比，发光效率最大提高了 85%。
