Nature CommunicationsExcited state reversal in copper iodide clusters enables 100% exciton radiationYushan MengChenglin LiuJingjing FeiYue XuYidan WangJing ZhangChunbo DuanChunmiao HanHui Xu2025-12-16Full textDOI https://doi.org/10.1038/s41467-025-67664-x