Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany.
Opt Lett. 2011 Apr 15;36(8):1443-5. doi: 10.1364/OL.36.001443.
We investigate a set of transparent organic LEDs (TOLEDs) with different organic capping layer (OC) thicknesses to understand the capping layer effect. We find that thickness variation of the OC strongly influences the emission properties of TOLEDs and exhibits different trends for top or bottom emission. The external quantum efficiency for the top side can be enhanced by a factor of 63%, but that of the bottom side only by 4% compared to a reference device without an OC. Additionally, we demonstrate that the introduction of the OC is an effective method to control the bottom-to-top emission ratio within a measured range from 2.87 to 6.05.
我们研究了一组具有不同有机覆盖层（OC）厚度的透明有机发光二极管（TOLED），以了解覆盖层的影响。我们发现，OC 的厚度变化强烈影响 TOLED 的发射特性，并且对于顶发射或底发射表现出不同的趋势。与没有 OC 的参考器件相比，顶发射的外量子效率可以提高 63%，而底发射仅提高 4%。此外，我们证明了引入 OC 是一种有效方法，可以在测量范围内（2.87 至 6.05）控制底到顶的发射比。
