Abstract In this work, we have studied a molybdenum oxide (MoO3) layer as an effective capping layer (CL) for TOLEDs. We varied the thickness of the capping layer in order to investigate its effects on the device performance. Both the top and bottom emission of the devices were found to be easily controlled by changing the thickness of MoO3 layer. Especially, at the CL thickness of 40 nm, the current efficiency shows 2.2 times enhancement compared to reference device which has no capping layer and exhibited the highest transmittance value. The results also revealed that the transmittance and light outcoupling efficiency are significantly dependent on the capping layer thickness and exhibit identical trend in change. In addition, the changes in the emission characteristics were optically simulated which agreed well with the experimental data.

中文翻译：

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具有氧化钼覆盖层的透明有机发光二极管的发射特性

摘要 在这项工作中，我们研究了氧化钼 (MoO3) 层作为 TOLED 的有效覆盖层 (CL)。我们改变了覆盖层的厚度，以研究其对器件性能的影响。发现器件的顶部和底部发射都可以通过改变 MoO3 层的厚度轻松控制。特别是，在 40 nm 的 CL 厚度下，与没有覆盖层并表现出最高透射率值的参考器件相比，电流效率提高了 2.2 倍。结果还表明，透射率和光输出耦合效率显着依赖于覆盖层厚度，并表现出相同的变化趋势。此外，对发射特性的变化进行了光学模拟，与实验数据吻合良好。