In this work, CsPbBr₃ perovskite nanocrystals (NCs) synthesized via a ligand-assisted reprecipitation method (LCPB) were discovered to emit self-enhanced electrochemiluminescence (ECL) with the surface oleylamine as both a coreactant and a stabilizer. Solvent regulation and tri-n-octylphosphine post-treatment were manipulated for size-selected and surface-passivated LCPBs, which showed remarkable aqueous ECL performance with respect to efficiency and stability. Furthermore, thanks to the self-enhancement mode with a shorter charge transfer pathway and less energy loss, the ECL efficiency obtained for these as-synthesized LCPBs in aqueous solution without any additional coreactant was up to 57.08% using the Ru(bpy)₃²⁺-tripropylamine system as the standard. As a proof-of-concept, the products were successfully employed for the bioanalyses of hydrogen peroxide, ascorbic acid, and cancer cells based on inhibition, coreaction, and impedance detection principles, respectively. More importantly, the basic properties of LCPBs in aqueous media including surface chemistry, charge transfer process, and ECL mechanism were studied systematically. Such efforts are aimed at perfecting the fundamental research of all-inorganic perovskite NCs and opening an avenue for the design of highly crystalline and luminescent perovskites as advanced ECL emitters for applications in the ECL domain.

中文翻译：

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尺寸选择和表面钝化的CsPbBr3钙钛矿纳米晶体，用于水性介质中的自增强电化学发光

在这项工作中，发现通过配体辅助再沉淀法（LCPB ）合成的CsPbBr ₃钙钛矿纳米晶体（NCs）发射出自增强的电致发光（ECL），表面油胺既是共活化剂又是稳定剂。溶剂调节和三- Ñ -octylphosphine后处理被操纵为大小选择和表面钝化LCPBs，这表明相对于效率和稳定性显着含水ECL性能。此外，由于具有短电荷转移路径和较少能量损失的自增强模式，使用Ru（bpy）₃ ²可以在不添加任何共反应物的情况下将这些合成的LCPB在水溶液中获得的ECL效率高达57.08％。⁺-三丙胺体系为标准。作为概念验证，该产品分别基于抑制，共作用和阻抗检测原理成功地用于过氧化氢，抗坏血酸和癌细胞的生物分析。更为重要的是，系统地研究了LCPB在水性介质中的基本性质，包括表面化学，电荷转移过程和ECL机理。这些努力旨在完善全无机钙钛矿NC的基础研究，并为设计高度结晶和发光的钙钛矿作为ECL领域中的高级ECL发射体开辟一条途径。