近日，浙江大学的叶志镇&戴兴良及其研究小组取得一项新进展。经过不懈努力，他们实现基于环境友好型金属卤化物纳米团簇的高效明亮宽带电致发光。相关研究成果已于2024年4月7日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队通过创新的一步溶液合成-沉积工艺，结合专门设计的配体和精细挑选的溶剂，成功制备了卤化铜纳米簇单发射器，实现了高效超宽带电致发光。CuI纳米团簇在激发态下展现出高刚度特性，同时具备磷光和温度激活延迟荧光的双发射模式，使得由均匀团簇组成的薄膜表现出卓越的稳定性和高光致发光效率。因此，所制备的超宽带发光二极管（LED）在惰性或无封装的空气环境中性能几乎不受影响，且展现出出色的高温工作性能。

该LED的半最大发射全宽度（FWHM）达到约120nm，峰值外量子效率为13%，最大亮度高达约为50,000 cdm^-2，且在100 cdm-2亮度下的工作半衰期为137小时。这一研究成果凸显了卤化铜纳米团簇在下一代健康照明领域中的巨大潜力。

据悉，基于环境友好型发射体的宽带电致发光技术在健康照明方面前景广阔，但仍面临着前所未有的挑战。卤化铜基发射体是宽带发射的有力候选材料，尽管卤化铜基发射体表现出高性能的电致发光特性，其宽带发射带宽却不足90nm。

附：英文原文

Title: Efficient and bright broadband electroluminescence based on environment-friendly metal halide nanoclusters

Author: Zhang, Dingshuo, Zhu, Meiyi, He, Yifan, Cao, Qingli, Gao, Yun, Li, Hongjin, Lu, Guochao, Cui, Qiaopeng, Shen, Yongmiao, He, Haiping, Dai, Xingliang, Ye, Zhizhen

Issue&Volume: 2024-04-07

Abstract: Broadband electroluminescence based on environment-friendly emitters is promising for healthy lighting yet remains an unprecedented challenge to progress. The copper halide-based emitters are competitive candidates for broadband emission, but their high-performance electroluminescence shows inadequate broad emission bandwidth of less than 90nm. Here, we demonstrate efficient ultra-broadband electroluminescence from a copper halide (CuI) nanocluster single emitter prepared by a one-step solution synthesis-deposition process, through dedicated design of ligands and subtle selection of solvents. The CuI nanocluster exhibits high rigidity in the excitation state as well as dual-emissive modes of phosphorescence and temperature-activated delayed fluorescence, enabling the uniform cluster-composed film to show excellent stability and high photoluminescent efficiency. In consequence, ultra-broadband light-emitting diodes (LEDs) present nearly identical performance in an inert or air atmosphere without encapsulation and outstanding high-temperature operation performance, reaching an emission full width at half maximum (FWHM) of ~120nm, a peak external quantum efficiency of 13%, a record maximum luminance of ~50,000cdm2, and an operating half-lifetime of 137h at 100cdm^-2. The results highlight the potential of copper halide nanoclusters for next-generation healthy lighting.

DOI: 10.1038/s41377-024-01427-z

Source: https://www.nature.com/articles/s41377-024-01427-z