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

作者：Dingshuo Zhang, Meiyi Zhu, Yifan He, Qingli Cao, Yun Gao, Hongjin Li, Guochao Lu, Qiaopeng Cui, Yong‐Miao Shen, Haiping He, Xingliang Dai, Zhizhen Ye · 发表于：Light Science & Applications · 年份：2024 · DOI：10.1038/s41377-024-01427-z · 被引用次数：18 · 研究领域：Nanocluster Synthesis and Applications、Quantum Dots Synthesis And Properties、Carbon and Quantum Dots Applications

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 90 nm. 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 ~120 nm, a peak external quantum efficiency of 13%, a record maximum luminance of ~50,000 cd m −2 , and an operating half-lifetime of 137 h at 100 cd m −2 . The results highlight the potential of copper halide nanoclusters for next-generation healthy lighting.