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Reversible Electrochemical Control over Photoexcited Luminescence of Core/Shell CdSe/ZnS Quantum Dot Film

机译:核/壳CdSe / ZnS量子点薄膜光激发发光的可逆电化学控制

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摘要

Semiconductor quantum dots (QDs) are widely used in light-emitting diodes and solar cells. Electrochemical modulation is a good way to understand the electrical and optical properties of QDs. In this work, the effects of electrochemical control on photoluminescence (PL) spectra in core/shell CdSe/ZnS QD films are studied. The results show different spectral responses for surface emission and core emission when a negative electrochemical potential is applied: the core emission is redshifted while the surface emission is blueshifted. The former is attributed to the electrostatic expansion of the excitonic wave function, due to the asymmetric distribution of adsorbed cations on the surface of the dots. The latter is attributed to the occupation of lower surface states by the injected electrons, i.e., the photoexcited electrons are more likely to be trapped onto higher surface states, leading to a blueshift of the surface emission. Both the spectral shift and the accompanying PL-quenching processes are reversible by resetting the potential.
机译:半导体量子点(QD)广泛用于发光二极管和太阳能电池。电化学调制是了解量子点的电学和光学特性的好方法。在这项工作中,研究了电化学控制对核/壳CdSe / ZnS QD薄膜中的光致发光(PL)光谱的影响。结果显示,当施加负电化学电位时,表面发射和核心发射的光谱响应不同:核心发射发生红移,而表面发射发生蓝移。前者归因于激子波函数的静电膨胀,这是由于点表面吸附阳离子的不对称分布所致。后者归因于被注入的电子占据了较低的表面态,即,光激发的电子更可能被捕获到较高的表面态上,从而导致表面发射的蓝移。通过重置电势,频谱偏移和伴随的PL猝灭过程都是可逆的。

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