In this work, the extraction of waveguided and substrate modes in organic light emitting diodes (OLEDs) is improved by using compact light scattering layers composed of a disordered 2D array of TiO₂ nanopillars. The TiO₂ nanopillars are fabricated by combining a self-assembly and a solvent-assisted lift-off process, and are further planarized by a 250 nm thin epoxy-based photoresist layer to facilitate their anode deposition and integration within the OLED stack. This fabrication route allows engineering internal light outcoupling elements with a limited amount of parasitic absorption and with easily tunable light scattering properties that are effective over a broad spectral and angular range. Taking the example of a monochromatic bottom emitting OLED ( ${\lambda }_{peak}$ = 520 nm), the authors demonstrate an efficiency enhancement of +22%_rel upon the incorporation of the planarized light extraction layer as well as ameliorated angular emission characteristics. This approach can be integrated in a high-throughput fabrication routine and straightforwardly extended to other OLED layouts.

中文翻译：

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基于无序二氧化钛纳米柱的平面化紧凑光散射层用于有机发光二极管中的光提取

在这项工作中，通过使用由 TiO ₂纳米柱的无序二维阵列组成的紧凑光散射层，改善了有机发光二极管 (OLED) 中波导和基板模式的提取。TiO ₂纳米柱是通过结合自组装和溶剂辅助剥离工艺制造的，并通过 250 nm 薄的环氧基光刻胶层进一步平坦化，以促进它们在 OLED 堆栈中的阳极沉积和集成。这种制造路线允许设计具有有限量寄生吸收和易于调节的光散射特性的内部光输出耦合元件，这些特性在宽光谱和角度范围内有效。以单色底发光OLED为例（${\lambda }_{磷\mathrm{电子}\mathrm{一种}克}$= 520 nm），作者证明了结合平面化光提取层的效率提高了 +22% _rel以及改善的角发射特性。这种方法可以集成到高通量制造程序中，并直接扩展到其他 OLED 布局。