This work presents studies of IR luminescence sensitization of Indocyanine Green dye (ICG), observed during association with colloidal Ag₂S quantum dots with an average size of 2.2 nm passivated with thioglycolic acid (Ag₂S/TGA QD). The opportunity of enhancing the dye monomer luminescence (peak at 820 nm) by 4–6 times under excitation of 660 nm in the presence of Ag₂S/TGA QDs (2.2 nm) was shown. At the same time, Ag₂S/TGA QDs luminescence intensity does not change. quantum yield (QY) luminescence of ICG increases by 5 times. The luminescence lifetime obtained with use of luminescence decay analysis at wavelength of 820 nm increases by 2.2 times. The observed changes in ICG luminescent properties during its conjugation with Ag₂S/TGA QDs are result of a decrease in the mobility of the dye polymethine chain due to coordination interaction with Ag₂S/TGA QDs, which decreases the efficiency of non-radiative transitions.

这项工作提出了对吲哚菁绿染料（ICG）的红外发光敏化的研究，该过程是在与平均大小为2.2 nm的胶体Ag ₂ S量子点缔合后被巯基乙酸（Ag ₂ S / TGA QD）钝化的。在存在Ag ₂ S / TGA QDs（2.2 nm）的情况下，在660 nm激发下，染料单体的发光能力（在820 nm峰值）增强了4-6倍。同时，Ag ₂ S / TGA QDs的发光强度不变。ICG的量子产率（QY）发光增加了5倍。使用发光衰减分析在820 nm波长下获得的发光寿命增加了2.2倍。与银共轭时观察到的ICG发光特性的变化₂ S / TGA QD是由于与Ag ₂ S / TGA QD的配位相互作用而导致染料多甲基链的迁移率降低的结果，这降低了非辐射跃迁的效率。