Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core–shell quantum dots
Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core–shell quantum dots
复制标题
DOI：
10.1088/0953-8984/28/25/254001
复制
发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Junsheng Chen;K. Žídek;M. Abdellah;M. Al-Marri;Kaibo Zheng;T. Pullerits
中科院分区：
文献类型：
--
作者：
Junsheng Chen;K. Žídek;M. Abdellah;M. Al-Marri;Kaibo Zheng;T. Pullerits
在Cdx Sey Zn 1 −x S1−y梯度核壳量子点（QD）和金纳米棒（NR）的复合膜中，QD的光学性质受到等离子体纳米颗粒的极大影响。我们提供了一个仔细的研究的两步形成的薄膜和它的形态。随后，我们专注于量子点发光的光活化-量子点表面的光化学变化引起的过程。我们观察到，即使是稀疏覆盖的AuNR也可以完全抑制薄膜中量子点发射的光活化。我们表明，抑制可以占量子点和金核受体之间的快速能量转移。最后，我们提出，发射光活化的行为可以被用来作为一个签名，以区分能量和电子转移的量子点为基础的材料。
In a composite film of Cdx Sey Zn1−x S1−y gradient core–shell quantum dots (QDs) and gold nanorods (NRs), the optical properties of the QDs are drastically affected by the plasmonic nanoparticles. We provide a careful study of the two-step formation of the film and its morphology. Subsequently we focus on QD luminescence photoactivation—a process induced by photochemical changes on the QD surface. We observe that even a sparse coverage of AuNRs can completely inhibit the photoactivation of the QDs’ emission in the film. We demonstrate that the inhibition can be accounted for by a rapid energy transfer between QDs and AuNRs. Finally, we propose that the behavior of emission photoactivation can be used as a signature to distinguish between energy and electron transfer in the QD-based materials.