Song Yongbo, Li Yingwei, Zhou Meng, Liu Xuan, Li Hao, Wang He, Shen Yuhua, Zhu Manzhou, Jin Rongchao
School of Biomedical Engineering, Anhui Medical University, Hefei 230032, Anhui, China.
Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Sci Adv. 2021 Jan 6;7(2). doi: 10.1126/sciadv.abd2091. Print 2021 Jan.
The photoluminescence of metal nanoclusters is typically low, and phosphorescence emission is rare due to ultrafast free-electron dynamics and quenching by phonons. Here, we report an electronic engineering approach to achieving very high phosphorescence (quantum yield 71.3%) from a [Au@Cu(SPh Bu)(PPh(CHCN))] nanocluster (abbreviated ) in non-degassed solution at room temperature. The structure of has a single-Au-atom kernel, which is encapsulated by a rigid Cu(I) complex cage. This core-shell structure leads to highly efficient singlet-to-triplet intersystem crossing and suppression of nonradiative energy loss. Unlike the phosphorescent organic materials and organometallic complexes-which require de-aerated conditions due to severe quenching by air (i.e., O)-the phosphorescence from is much less sensitive to air, which is important for lighting and biomedical applications.
金属纳米团簇的光致发光通常较低，由于超快的自由电子动力学和声子猝灭，磷光发射很少见。在此，我们报道了一种电子工程方法，可在室温下的非脱气溶液中，从[Au@Cu(SPhBu)(PPh(CHCN))]纳米团簇（简称为 ）实现非常高的磷光（量子产率71.3%）。 的结构具有单个金原子内核，被刚性的Cu(I)络合物笼包裹。这种核壳结构导致高效的单重态到三重态系间窜越，并抑制非辐射能量损失。与磷光有机材料和有机金属配合物不同——由于空气（即O）的严重猝灭，它们需要脱气条件—— 的磷光对空气的敏感度要低得多，这对于照明和生物医学应用很重要。
