Reducing the dimensions of materials is one of the key approaches to discovering novel optical phenomena. The recent emergence of 2D transition metal dichalcogenides (TMDCs) has provided a promising platform for exploring new optoelectronic device applications, with their tunable electronic properties, structural controllability, and unique spin valley–coupled systems. This progress report provides an overview of recent advances in TMDC‐based light‐emitting devices discussed from several aspects in terms of device concepts, material designs, device fabrication, and their diverse functionalities. First, the advantages of TMDCs used in light‐emitting devices and their possible functionalities are presented. Second, conventional approaches for fabricating TMDC light‐emitting devices are emphasized, followed by introducing a newly established, versatile method for generating light emission in TMDCs. Third, current growing technologies for heterostructure fabrication, in which distinct TMDCs are vertically stacked or laterally stitched, are explained as a possible means for designing high‐performance light‐emitting devices. Finally, utilizing the topological features of TMDCs, the challenges for controlling circularly polarized light emission and its device applications are discussed from both theoretical and experimental points of view.

中文翻译：

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单层过渡金属二硫属化物作为光源

减小材料的尺寸是发现新颖的光学现象的关键方法之一。2D过渡金属二硫化碳（TMDC）的最新出现为它们开发了可调谐的电子特性，结构可控性和独特的自旋谷耦合系统，为探索新的光电器件应用提供了一个有前途的平台。这份进度报告概述了基于TMDC的发光器件的最新进展，从器件概念，材料设计，器件制造及其各种功能等多个方面进行了讨论。首先，介绍了用于发光器件的TMDC的优点及其可能的功能。其次，强调了制造TMDC发光器件的常规方法，然后介绍了一种新近建立的，在TMDC中产生发光的通用方法。第三，解释了当前异质结构制造中不断发展的技术，其中不同的TMDC垂直堆叠或横向缝合，是设计高性能发光器件的一种可能方法。最后，利用TMDC的拓扑特征，从理论和实验的角度讨论了控制圆偏振光发射及其设备应用的挑战。