摘要
AuCu bimetallic nanoclusters exhibit enhanced emission relative to structurally analogous Au nanoclusters,though their excited-state dynamics remains incompletely characterized.Here,we chose AuCu_(14)as a system to probe the excited-state behaviors and triplet energy transfer dynamics of bimetallic nanoclusters.The O_(2)sensitivity of both photoluminescence quantum yield and excited-state lifetime confirms triplet-origin emission,while the minimal spectral changes at low temperature suggest weak electron-vibration coupling.Notably,although O_(2)induces significant photoluminescence quenching,the addition of triplet-state acceptors(perylene and anthracene)shows no quenching effect due to steric hindrance from surface ligands.These results advance the mechanistic understanding of triplet-state dynamics in AuCu bimetallic nanoclusters.
相较于结构相似的Au纳米团簇,AuCu双金属纳米团簇表现出更优异的发光性能,然而其激发态动力学机制尚不明确.本文以AuCu_(14)纳米团簇为研究对象,系统探究了双金属纳米团簇的激发态演化过程与三重态能量转移动力学.实验结果表明,该双金属团簇的光致发光量子产率与激发态寿命均对氧气敏感,证实其发射来源于三重态.变温紫外-可见吸收光谱未观察到显著的光谱变化,这表明了体系中较弱的电子-振动耦合效应.值得注意的是,尽管氧气可引起显著的光致发光猝灭,但由于表面配体空间位阻的阻碍作用,三重态受体苝与蒽的加入并未引发猝灭效应.本研究为理解AuCu双金属纳米团簇的三重态动力学机制提供了重要理论依据.
基金
supported by the National Natural Science Foundation of China(No.22273095).
