Quasi-two-dimensional (quasi-2D) perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation light-emitting diodes (LEDs). The outstanding optical properties originate from their structural characteristics. In particular, the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectric- and quantum-confinement effects; the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields (PLQYs), particularly at low excitation intensities. The review herein presents an overview of the inherent properties of quasi-2D perovskite materials, the corresponding energy transfer and spectral tunability methodologies for thin films, as well as their application in high-performance LEDs. We then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D PeLEDs. The review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.

准二维（准2D）钙钛矿由于其优异的半导体性能而引起了极大的关注，并已成为下一代发光二极管（LED）最有前途的材料之一。出色的光学性能源于其结构特性。特别是，由于强介电和量子限制效应，固有的量子阱结构赋予它们很大的激子结合能；因此，不同n值物种之间相应的能量转移导致高光致发光量子产率（PLQY），特别是在低激发强度下。本文综述概述了准二维钙钛矿材料的固有特性、相应的薄膜能量转移和光谱可调性方法，以及它们在高性能 LED 中的应用。然后，我们总结了开发高性能且稳定的准 2D PeLED 面临的挑战和潜在的研究方向。该综述为业界提供了系统且及时的总结，以加深对准二维钙钛矿材料及其LED器件的理解。