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首页> 外文期刊>Physical review >Enhanced light emission from top-emitting organic light-emitting diodes by optimizing surface plasmon polariton losses
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Enhanced light emission from top-emitting organic light-emitting diodes by optimizing surface plasmon polariton losses

机译：通过优化表面等离子激元损耗来增强顶部发光有机发光二极管的发光

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摘要

We demonstrate enhanced light extraction for monochrome top-emitting organic light-emitting diodes (OLEDs). The enhancement by a factor of 1.2 compared to a reference sample is caused by the use of a hole transport layer (HTL) material possessing a low refractive index (～1.52). The low refractive index reduces the in-plane wave vector of the surface plasmon polariton (SPP) excited at the interface between the bottom opaque metallic electrode (anode) and the HTL. The shift of the SPP dispersion relation decreases the power dissipated into lost evanescent excitations and thus increases the outcoupling efficiency, although the SPP remains constant in intensity. The proposed method is suitable for emitter materials having isotropic orientation of the transition dipole moments as well as anisotropic, preferentially horizontal orientation, resulting in comparable enhancement factors. Furthermore, for sufficiently low refractive indices of the HTL material, the SPP can be modeled as a propagating plane wave within other organic materials in the optical microcavity. Thus, by applying further extraction methods, such as microlenses or Bragg gratings, it would become feasible to obtain even higher enhancements of the light extraction.
机译：我们展示了单色顶部发射有机发光二极管（OLED）的增强光提取。与参考样品相比，提高了1.2倍，这是由于使用了具有低折射率（〜1.52）的空穴传输层（HTL）材料引起的。低折射率降低了在底部不透明金属电极（阳极）和HTL之间的界面激发的表面等离子体激元（SPP）的面内波矢量。尽管SPP的强度保持恒定，但SPP色散关系的移动减少了耗散到失去的e逝激发中的功率，从而提高了外耦合效率。所提出的方法适用于具有过渡偶极矩的各向同性取向以及各向异性，优选为水平取向的发射体材料，从而得到可比较的增强因子。此外，对于HTL材料的足够低的折射率，可以将SPP建模为光学微腔中其他有机材料内的传播平面波。因此，通过应用其他提取方法，例如微透镜或布拉格光栅，获得更高的光提取增强将变得可行。

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