It has long been a challenge to develop a highly efficient outcoupling method for organic light-emitting diodes that is independent of wavelength and viewing angle, as well as being nonintrusive into the device structure. Here, we demonstrate a transparent, top emitting structure integrated with a high index of refraction waveguide layer and a rough, dielectric diffuse reflector that eliminates plasmonic, waveguide, and substrate modes without introducing wavelength and viewing-angle dependence. The simple outcoupling structure increases the external quantum efficiency from 15 ± 2% to 37 ± 4% compared to an analogous device with a metal mirror, corresponding to a 2.5-fold enhancement without requiring the use of additional outcoupling structures such as microlens arrays or index matching layers to extract substrate modes. The method is potentially suitable for low-cost, solid-state lighting due to its simplicity and high outcoupling efficiency.

中文翻译：

---

使用光散射介电层的有机发光器件的高效外耦合

长期以来，为有机发光二极管开发一种高效的输出耦合方法一直是一个挑战，该方法与波长和视角无关，并且不会干扰器件结构。在这里，我们展示了一个透明的顶部发射结构，该结构与高折射率波导层和一个粗糙的介电漫反射器集成在一起，该反射器消除了等离激元，波导和衬底模式，而没有引入波长和视角依赖性。与带有金属镜的类似器件相比，简单的外耦合结构将外部量子效率从15±2％提高到37±4％，相当于2.5倍的增强，而无需使用其他外耦合结构，例如微透镜阵列或分度镜匹配层以提取衬底模式。