Light Out‐Coupling Management in Perovskite LEDs—What Can We Learn from the Past?,Advanced Functional Materials

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Light Out‐Coupling Management in Perovskite LEDs—What Can We Learn from the Past?
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-02 , DOI: 10.1002/adfm.202002570
Qianpeng Zhang ₁ , Daquan Zhang _{1,

2} , Yu Fu _{1,

2} , Swapnadeep Poddar ₁ , Lei Shu ₁ , Xiaoliang Mo ₃ , Zhiyong Fan _{1,

2}

Affiliation

The research on perovskite light‐emitting diodes (PeLEDs) has experienced an exponential growth in the past six years. The highest external quantum efficiencies (EQEs) have surpassed 20%, 20%, and 10% for red, green, and blue colored LEDs, respectively. Considering the internal quantum efficiency is already approaching unity owing to the high material quality, the limiting factor for further improving the EQE is mainly the poor light out‐coupling efficiencies. Here, by reviewing the progress on the light out‐coupling studies for PeLEDs, organic LEDs (OLEDs), conventional semiconductor LEDs, and other special LEDs, the rational design guidelines are summarized for enhancing PeLED out‐coupling. Briefly, these design guidelines include: 1) introducing nanostructures into the active layer or tuning the thickness of it to couple out the waveguide modes, 2) adding nanostructures between the active layer and transparent electrodes to couple the waveguide modes to substrate modes, 3) adding nanostructures such as nanowires to the glass substrate to couple the substrate mode to air. Essentially, these guidelines indicate that implementing nanophotonic engineering on PeLEDs is a highly promising direction to explore, so as to substantially enhance the device performance.

中文翻译：

钙钛矿LED的光输出耦合管理—我们可以从中学到什么？

在过去的六年中，钙钛矿发光二极管（PeLED）的研究经历了指数级增长。红色，绿色和蓝色LED的最高外部量子效率（EQE）分别超过20％，20％和10％。考虑到由于材料质量高，内部量子效率已经接近统一，因此进一步提高EQE的限制因素主要是较差的光耦合效率。在这里，通过回顾PeLED，有机LED（OLED），常规半导体LED和其他特殊LED的光输出耦合研究的进展，总结了用于增强PeLED输出耦合的合理设计指南。简要地说，这些设计指南包括：1）将纳米结构引入有源层或调整其厚度以耦合出波导模式，2）在有源层和透明电极之间添加纳米结构，以将波导模式耦合到基板模式； 3）在玻璃基板上添加纳米结构，例如纳米线，以将基板模式耦合到空气。从本质上讲，这些指南表明，在PeLED上实施纳米光子工程技术是一个非常有希望的探索方向，以大大提高器件性能。

更新日期：2020-07-02

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