The inferior light extraction efficiency (LEE), which is generally less than 20%, based on optical modeling, and the difficulty in achieving white emission are the two main challenges in the metal-halide-perovskite light-emitting diode (PeLED) field. Herein, we report a simple and efficient approach to construct high-performance white PeLEDs with much-enhanced LEE by coupling a blue PeLED with a layer of red perovskite nanocrystal (PeNC) down-converter through a rationally designed multilayer semitransparent electrode (LiF/Al/Ag/LiF). The red PeNC layer allows the extraction of the trapped waveguide mode and surface plasmon polariton mode in a blue PeLED and converts them to red emission, resulting in over 50% LEE improvement. Simultaneously, the complementary emission spectrum of blue photons and down-converting red photons contributes to a white PeLED with a high external quantum efficiency and luminance of more than 12% and approximately 2,000 cd m⁻², respectively, which represent state-of-the-art results in this field.

基于光学模型，劣质的光提取效率（LEE）通常低于20％，难以实现白色发射是金属卤化物-钙钛矿型发光二极管（PeLED）领域的两个主要挑战。在本文中，我们报告了一种简单有效的方法，通过合理设计的多层半透明电极（LiF / Al），将蓝色PeLED与红色钙钛矿纳米晶体（PeNC）下变频器层耦合，从而构建具有增强型LEE的高性能白色PeLED。 / Ag / LiF）。红色PeNC层允许提取蓝色PeLED中捕获的波导模式和表面等离子体激元极化模式，并将其转换为红色发射，从而使LEE改善了50％以上。同时，^-2分别代表该领域的最新技术成果。