Influence of the Emission Layer Thickness on the Optoelectronic Properties of Solution Processed Organic Light-Emitting Diodes
Influence of the Emission Layer Thickness on the Optoelectronic Properties of Solution Processed Organic Light-Emitting Diodes
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DOI：
10.1021/ph500186m
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发表时间：
2014-10-01
期刊：
影响因子：
7
通讯作者：
Colsmann, Alexander
中科院分区：
文献类型：
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作者：
Hoefle, Stefan;Lutz, Tobias;Colsmann, Alexander
我们研究了溶液处理有机发光二极管 (OLED) 的光电特性与其活性层厚度的函数关系。通过使用水平浸渍技术并在湿膜沉积过程中加速涂布棒，我们在单个工艺步骤中制造了具有不同发射层厚度但相同工艺记录的OLED阵列。光电器件参数的比较可以得出有关注入限制、层厚度优化的结论，并结合弱腔效应的光学模拟，促进对发射轮廓的更深入理解。为了展示该方法的普适性，我们研究了纯聚合物发射体、聚合物和小分子的混合物以及全小分子材料系统。
We investigated the optoelectronic properties of solution processed organic light emitting diodes (OLEDs) as a function of their active layer thickness. By using a horizontal dipping technique and by accelerating the coating bar during wet film deposition, we fabricated OLED arrays with different emission layer thicknesses but identical process records in a single process step. The comparison of the optoelectronic device parameters allows for conclusions on injection limitation, the optimization of the layer thickness, and, in conjunction with optical simulations of the weak cavity effect, to promote a deeper understanding of the emission profile. To show the universality of this method, we investigated purely polymeric emitters, blends of polymers and small molecules as well as all-small molecule material systems.