Highly luminescent inks are desirable for various applications such as decorative coating, art painting, anti-counterfeiting, to name a few. However, present inks display low photoluminescent efficiency requiring a strong excitation light to make them shining. Here, we report a highly luminescent ink based on the copper-iodide/1-Propyl-1,4-diazabicyclo[2.2.2]octan-1-ium (Cu4I6(pr-ted)2) hybrid cluster with a quantum efficiency exceeding 98%. Under the interaction between Cu4I6(pr-ted)2 hybrid cluster and polyvinylpyrrolidone (PVP), the highly luminescent Cu4I6(pr-ted)2/PVP ink can be facilely prepared via the one-pot solution synthesis. The obtained ink exhibits strong green light emission that originates from the efficient phosphorescence of Cu4I6(pr-ted)2 nanocrystals. Attractively, the ink displays high conversion efficiency for the ultraviolet light to bright green light emission due to its wide Stokes-shift, implying great potentials for anti-counterfeiting and luminescent solar concentrator coating.

中文翻译：

---

光致发光量子效率超过 98% 的高发光碘化铜簇基墨水

高发光油墨适用于各种应用，例如装饰涂层、艺术绘画、防伪等。然而，目前的油墨显示出低光致发光效率，需要强激发光才能使其发光。在这里，我们报告了一种基于碘化铜/1-Propyl-1,4-diazabicyclo[2.2.2]octan-1-ium (Cu4I6(pr-ted)2) 杂化簇的高发光墨水，其量子效率超过98%。在Cu4I6(pr-ted)2杂化簇与聚乙烯吡咯烷酮(PVP)相互作用下，可以通过一锅法合成制备高发光度的Cu4I6(pr-ted)2/PVP油墨。获得的墨水表现出强烈的绿光发射，这源于 Cu4I6(pr-ted)2 纳米晶体的有效磷光。吸引人的，