Abstract A convenient strategy to enhance the aqueous stability and radiative-charge-transfer of perovskite nanocrystals (PNCs) is developed via hybriding CsPbBr3 PNCs with Ag2S nanoparticles, which is conducted by directly decomposing silver diethyldithiocarbamate in CsPbBr3 PNCs crude. The obtained CsPbBr3-Ag2S hybrids are aqueous stable, and exhibit obviously enhanced aqueous photoluminescence (PL) with a quantum yield up to 82% in pure water as well as boosted electrochemical response for charge injection and 9-fold enhanced electrochemiluminescence (ECL) than CsPbBr3 PNCs in aqueous electrolyte. Both PL and ECL spectra of CsPbBr3-Ag2S hybrids are almost identical to the PL spectrum of CsPbBr3 PNCs, indicating radiative-charge-transfer within CsPbBr3-Ag2S hybrids only occurs in CsPbBr3 segment. Annihilation ECL demonstrates that all the charges injected onto CsPbBr3-Ag2S hybrids at the redox potentials of Ag2S segment can be efficiently transferred into CsPbBr3 segment to enhance radiative-charge-transfer. This strategy is promising for the application of PNCs as well as the developing of novel electrochemiluminophores.

中文翻译：

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CsPbBr3/Ag2S钙钛矿纳米晶杂化物增强的水稳定性和辐射电荷转移

摘要 通过将 CsPbBr3 PNCs 与 Ag2S 纳米颗粒混合，开发了一种提高钙钛矿纳米晶体 (PNCs) 的水性稳定性和辐射电荷转移的便捷策略，该策略通过直接分解 CsPbBr3 PNCs 粗品中的二乙基二硫代氨基甲酸银进行。所获得的 CsPbBr3-Ag2S 杂化物是水稳定的，并表现出明显增强的水性光致发光 (PL)，在纯水中的量子产率高达 82%，以及增强的电荷注入电化学响应和比 CsPbBr3 增强的电化学发光 (ECL) 9 倍水性电解质中的 PNC。CsPbBr3-Ag2S 杂化物的 PL 和 ECL 光谱与 CsPbBr3 PNC 的 PL 光谱几乎相同，表明 CsPbBr3-Ag2S 杂化物内的辐射电荷转移仅发生在 CsPbBr3 段。湮灭 ECL 表明，在 Ag2S 段的氧化还原电位下注入 CsPbBr3-Ag2S 杂化物的所有电荷都可以有效地转移到 CsPbBr3 段中，以增强辐射电荷转移。该策略有望用于 PNC 的应用以及新型电化学发光体的开发。