➀ Researchers from Zhejiang University developed a copper iodide nanocluster using a one-step synthesis process, aiming for eco-friendly and healthy lighting solutions. ➁ The nanocluster films exhibit high luminous efficiency and ultra-broadband emission, with stable spectra under varying conditions. ➂ The LEDs made from these nanoclusters show potential for next-generation lighting due to their environmental friendliness and cost-effectiveness.