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Enhanced fluorescence properties of type-I and type-II CdTe/CdS quantum dots using porous silver membrane

机译:使用多孔银膜增强I型和II型CdTe / CdS量子点的荧光特性

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This paper reports the metal-induced fluorescence property on the CdTe/CdS core/shell quantum dots (QDs), which exhibit the systematic band-gap transition from type-I to type-II with increasing shell thickness, near porous silver membrane by using time-resolved fluorescence lifetime imaging microscopy (FLIM). The results revealed that notable fluorescence enhancement came from the closed location to the cavity of the porous silver metal due to an increase in the local electromagnetic fields at the cavity. In the cases of the type-II CdTe/CdS QDs, interestingly, multiple exciton generation can be an additional factor for the lifetime reduction and fluorescence amplification compared to the type-I QDs. Without CdS shell, the strong interaction between the bare core CdTe QDs and silver caused emission quenching. (C) 2017 Elsevier B.V. All rights reserved.
机译:本文报道了金属诱导的CdTe / CdS核/壳量子点(QDs)上的荧光性质,随着壳厚度的增加,在CdTe / CdS核/壳量子点附近,系统显示了从I型到II型的系统能带隙跃迁,通过使用时间分辨荧光寿命成像显微镜(FLIM)。结果显示,由于空腔中局部电磁场的增加,显着的荧光增强来自多孔银金属的封闭位置。有趣的是,在II型CdTe / CdS QD的情况下,与I型QD相比,多重激子的产生可能是寿命降低和荧光放大的另一个因素。如果没有CdS壳,则裸芯CdTe QD和银之间的强相互作用会导致发射猝灭。 (C)2017 Elsevier B.V.保留所有权利。

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