Grevtseva Irina, Ovchinnikov Oleg, Smirnov Mikhail, Perepelitsa Alexey, Chevychelova Tamara, Derepko Violetta, Osadchenko Anna, Selyukov Alexandr
Opt Express. 2022 Feb 14;30(4):4668-4679. doi: 10.1364/OE.447200.
The luminescence properties of AgS quantum dots passivated with L-Cysteine (AgS/L-Cys QDs) are studied in the presence of Au nanorods passivated with cetyltrimethylammonium bromide molecules (Au/CTAB NRs). The effect of plasmonic Au/CTAB NRs on IR trap state luminescence (750 nm) is considered. It has been found that the direct interaction between the components of the plexcitonic nanostructure leads to a significant luminescence quenching of AgS/L-Cys QDs, with the luminescence lifetime being constant. This is the evidence for photoinduced charge transfer. The spatial separation of the components of plexcitonic nanostructures due to the introduction of a polymer - Poly(diallyldimethylammonium chloride) (PolyDADMAC) provides a means to change their mutual arrangement and achieve an increase in the IR trap state luminescence intensity and a decrease in the luminescence lifetime from 7.4 ns to 4.5 ns. With weak plexcitonic coupling in the nanostructures [AgS QD/L-Cys]/[PolyDADMAC]/[Au/CTAB NRs], the possibility of increasing the quantum yield of trap state luminescence for AgS QDs due to the Purcell effect has been demonstrated.
在存在用十六烷基三甲基溴化铵分子钝化的金纳米棒（Au/CTAB NRs）的情况下，研究了用L-半胱氨酸钝化的AgS量子点（AgS/L-Cys QDs）的发光特性。考虑了等离子体Au/CTAB NRs对红外陷阱态发光（750 nm）的影响。已经发现，激子复合纳米结构各组分之间的直接相互作用导致AgS/L-Cys QDs的发光显著猝灭，而发光寿命保持不变。这是光诱导电荷转移的证据。由于引入了聚合物——聚二烯丙基二甲基氯化铵（PolyDADMAC），激子复合纳米结构各组分的空间分离提供了一种改变它们相互排列的方法，并实现了红外陷阱态发光强度的增加以及发光寿命从7.4 ns降低到4.5 ns。在纳米结构[AgS QD/L-Cys]/[PolyDADMAC]/[Au/CTAB NRs]中激子耦合较弱的情况下，已经证明了由于珀塞尔效应提高AgS量子点陷阱态发光量子产率的可能性。
