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Quantum Dots with Highly Efficient, Stable, and Multicolor Electrochemiluminescence.
ACS Central Science ( IF 18.2 ) Pub Date : 2020-06-01 , DOI: 10.1021/acscentsci.0c00484
Zhiyuan Cao 1 , Yufei Shu 1 , Haiyan Qin 1 , Bin Su 1 , Xiaogang Peng 1
Affiliation  

Outstanding photoluminescence (PL) and electroluminescence properties of quantum dots (QDs) promise possibilities for them to meet challenging expectations of electrochemiluminescence (ECL), which at present relies on inefficient and spectral-irresolvable emitters based on transition-metal complexes (such as Ru(bpy)32+). However, ECL is reported to be extremely sensitive to the surface traps on the QDs likely because of the spatially and temporally separated electrochemical charge injections. Results here reveal that, by engineering the interior inorganic structure (CdSe/CdS/ZnS core/shell/shell structure) and inorganic–organic interface using new synthetic methods, the trap-insensitive QDs with near-unity PL quantum yield and monoexponential PL decay dynamics in water generated narrow band-edge ECL with efficiencies about six orders of magnitude higher than that of the standard Ru(bpy)32+. The band-edge and spectrally resolved ECL from CdSe/CdS/ZnS core/shell/shell QDs demonstrated a new readout scheme using electrochemical potential. Excellent ECL performance of QDs uncovered here offer opportunities to realize the full potential of ECL for biomedical detection and diagnosis.

中文翻译:

具有高效,稳定和多色电化学发光的量子点。

量子点(QD)具有出色的光致发光(PL)和电致发光特性,有望满足挑战性的电致化学发光(ECL)的期望,目前它依赖于基于过渡金属络合物(例如Ru( bpy)3 2+)。然而,据报道ECL对QD上的表面陷阱极为敏感,这可能是由于在空间和时间上分开的电化学电荷注入。结果表明,通过使用新的合成方法工程化内部无机结构(CdSe / CdS / ZnS核/壳/壳结构)和无机-有机界面,对陷阱不敏感的量子点具有近统一的PL量子产率和单指数PL衰减水动力学产生窄带边ECL,其效率比标准Ru(bpy)3 2+高约六个数量级。CdSe / CdS / ZnS核/壳/壳QD的带边缘和光谱分辨ECL证明了使用电化学势的新读出方案。此处发现的QD的出色ECL性能为实现ECL在生物医学检测和诊断方面的全部潜力提供了机会。
更新日期:2020-07-22
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