室温构筑水稳定钙钛矿量子点用于六价铬检测与发光二极管

doi:10.6023/A26040131

摘要/Abstract

为解决钙钛矿量子点水稳定性差、合成条件苛刻的难题,并实现六价铬（Cr(VI)）的高效检测,本研究通过双配体协同钝化设计,采用3-溴-2-(溴甲基)丙酸和油胺构筑配体界面,在温和的室温环境中成功合成了高性能、水相发光稳定的CsPbBr₃@BPA量子点。所合成量子点的发射半峰宽仅为22 nm,量子产率可达62.7%。基于其良好的水相荧光性能和Cr(VI)诱导的动态荧光猝灭机制,建立了高灵敏度和高特异性的检测方法,检测限低至4 nmol/L,线性范围0.02-2.4 μmol/L。该方法成功用于实际水样中Cr(VI)检测,回收率在93.3%-106.0%之间,证实了方法的可靠性和实用性。合成的量子点还被用于制备高色纯度发光二极管,展示了其在环境监测与固态照明领域的双功能应用价值。

关键词: CsPbBr₃@BPA量子点, 室温合成, 水稳定, Cr(VI)检测, 发光二极管

Hexavalent chromium (Cr(VI)), as a highly toxic heavy metal ion pollutant, poses severe threats to both aquatic ecosystems and human health. The development of rapid, sensitive, and selective methods for Cr(VI) detection is of great significance for environmental monitoring and public health protection. Perovskite quantum dots (QDs) have shown great potential in fluorescence sensing due to their excellent optical properties, but their practical applications are severely limited by poor water stability and harsh synthesis conditions (typically requiring high temperature). Herein, we report a room-temperature ligand engineering strategy that utilizes the synergistic effect of 3-bromo-2-(bromomethyl)propionic acid (BPA) and oleylamine (OLA) to one-step synthesize highly stable CsPbBr₃@BPA QDs in aqueous phase. The synergistic coordination of the dual bromine and carboxyl groups in the BPA molecule significantly lowers the nucleation energy barrier, effectively fills surface bromine vacancies, and suppresses non-radiative recombination. The as-prepared CsPbBr₃@BPA QDs exhibit excellent water dispersibility and luminescence performance, emitting bright green fluorescence with a photoluminescence quantum yield as high as 62.7% and a full width at half maximum of only 22 nm. Their fluorescence intensity remains stable in aqueous solution for over 144 hours. Furthermore, based on the effective fluorescence quenching of the QDs by Cr(VI), a highly sensitive and specific analytical method for Cr(VI) was successfully constructed, with a detection limit as low as 4 nmol/L and a linear range of 0.02-2.4 μmol/L. The method was successfully applied to the spiked recovery analysis of Cr(VI) in real water samples, including tap water, spring water, and lake water, with the recoveries ranging from 93.3% to 106.0%. In addition, the developed CsPbBr₃@BPA QDs were used to fabricate high-color-purity green and white light-emitting diodes, expanding their application scenarios. This work provides a new strategy for the room-temperature preparation of highly stable perovskite QDs and demonstrates their dual-functional application potential in environmental monitoring and solid-state lighting.

Key words: CsPbBr₃@BPA quantum dots, room-temperature synthesis, water-stable, Cr(VI) detection, light-emitting diodes

引用此文

张颖敏, 仝欣欣, 陈玉凤, 李建彤, 王鑫, 吴兆申, 刘俊豪, 刘健, 杨升宏. 室温构筑水稳定钙钛矿量子点用于六价铬检测与发光二极管[J]. 化学学报, doi: 10.6023/A26040131.

Zhang Yingmin, Tong Xinxin, Chen Yufeng, Li Jiantong, Wang Xin, Wu Zhaoshen, Liu Junhao, Liu Jian, Yang Shenghong. Room-temperature Construction of Water-stable Perovskite Quantum Dots for Cr(VI) Detection and Light-emitting Diodes[J]. Acta Chimica Sinica, doi: 10.6023/A26040131.

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