Near-unity NIR phosphorescent quantum yield from a room-temperature solvated metal nanocluster

• 成果类型: Article
• 署名作者: Shi, Wan-Qi; Zeng, Linlin; He, Rui-Lin; Han, Xu-Shuang; Guan, Zong-Jie; Zhou, Meng; Wang, Quan-Ming
• 署名单位: Tsinghua University; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Hunan University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11022
• DOI: 10.1126/science.adk6628
• 发表日期: 2024-01-19
• 页码: 326-330
• 关键词: species distribution models; CLIMATE-CHANGE; CONSERVATION; biodiversity; endemism; richness; plants; BIAS; distributions; performance

摘要

Metal nanoclusters have emerged as promising near-infrared (NIR)-emissive materials, but their room-temperature photoluminescence quantum yield (PLQY), especially in solution, is often low (<10%). We studied the photophysics of Au-22((BuPhC)-Bu-t equivalent to C)(18) (Au-22) and its alloy counterpart Au16Cu6((BuPhC)-Bu-t equivalent to C)(18) (Au16Cu6) (where Bu-t is tert-butyl and Ph is phenyl) and found that copper (Cu) doping suppressed the nonradiative decay (similar to 60-fold less) and promoted intersystem crossing rate (similar to 300-fold higher). The Au16Cu6 nanocluster exhibited >99% PLQY in deaerated solution at room temperature with an emission maximum at 720 nanometers tailing to 950 nanometers and 61% PLQY in the oxygen-saturated solution. The approach to achieve near-unity PLQY could enable the development of highly emissive metal cluster materials.