Because of the specific properties including HOMO–LUMO electronic transition, size-dependent fluorescent emission, and intense light absorption, metal nanoclusters (NCs) have been considered to be one of the most competitive color conversion materials in light-emitting diodes (LEDs). However, the monotonous emission color and the low emission stability and intensity of individual metal NCs strongly limit their universal application. Inspired by the concept of “aggregation-induced emission” (AIE), the utilization of highly ordered metal NC assemblies opens a door to resolve these problems. After self-assembly, the emission stability and intensity of metal NC assemblies are enhanced. At the same time, the emission color of metal NC assemblies become tunable. We termed this process as self-assembly driven AIE of metal NCs. In this review, we use Cu NCs as the example to convey the concept that the compact and ordered arrangement can efficiently improve the metal NCs’ emission stability, tunability, and intensity. We first introduce the synthesis of 2D Cu NC self-assemblies and their emissions. We further summarize some of the factors that can affect the emissions of 2D Cu NC self-assemblies. We then discuss the utilization of 2D Cu NC self-assemblies as color conversion materials for LEDs. At last, we outline current challenges and our perspectives on the development of this area.

中文翻译：

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自组装驱动的聚集诱导的铜纳米团簇发射：一种新型照明技术

由于包括HOMO-LUMO电子跃迁，尺寸依赖的荧光发射和强烈的光吸收等特殊特性，金属纳米团簇（NC）被认为是发光二极管（LED）中最具竞争力的颜色转换材料之一。但是，单个金属NC的单调发光颜色以及较低的发光稳定性和强度强烈地限制了它们的普遍应用。受“聚集诱导发射”（AIE）概念的启发，使用高度有序的金属NC组件为解决这些问题打开了一扇门。自组装后，增强了金属NC组件的发射稳定性和强度。同时，金属NC组件的发射颜色变得可调。我们称此过程为金属NC的自组装驱动AIE。在这篇评论中，我们以铜纳米管为例来说明这样的概念，即紧凑有序的排列可以有效地提高金属纳米管的发射稳定性，可调谐性和强度。我们首先介绍2D Cu NC自组装件的合成及其发射。我们进一步总结了一些可能影响2D Cu NC自组装发射的因素。然后，我们讨论将2D Cu NC自组装用作LED的颜色转换材料。最后，我们概述了当前的挑战以及我们对该领域发展的看法。我们进一步总结了一些可能影响2D Cu NC自组装发射的因素。然后，我们讨论将2D Cu NC自组装用作LED的颜色转换材料。最后，我们概述了当前的挑战以及我们对该领域发展的看法。我们进一步总结了一些可能影响2D Cu NC自组装发射的因素。然后，我们讨论将2D Cu NC自组装用作LED的颜色转换材料。最后，我们概述了当前的挑战以及我们对该领域发展的看法。