Gao Yuefeng, Xu Sai, Li Yanbiao, Chen Baojiu
College of Marine Engineering, Dalian Maritime University, Dalian, Liaoning 116026, China.
School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Feb 5;326:125219. doi: 10.1016/j.saa.2024.125219. Epub 2024 Sep 26.
The low photoluminescence quantum yield (PLQY) of CsPbCl perovskite quantum dots (PQDs) poses a significant challenge to their application as ion detection probes. To address this issue, we enhanced the PLQY of CsPbCl PQDs through Mn doping. These enhanced PQDs were then employed as probes for the highly sensitive detection of Cu ions and temperature. CsPbCl:Mn PQDs with varying Mn/Pb ratios were synthesized via hot injection. The Mn doping introduced an emission band near 600 nm, with intensity increasing alongside doping concentration. At an Mn/Pb ratio of 2.0, the PLQY was enhanced nearly tenfold, from 5.46 % for undoped CsPbCl to 52.48 % for CsPbCl:Mn. CsPbCl:Mn PQDs with the highest PLQY were employed as luminescent probes, utilizing the fluorescence intensity ratio (FIR) technique for copper detection and temperature sensing. The experimental results demonstrated a linear relationship between the FIR and Cu concentration over the range of 22.12 nM-1600 nM, with 22.12 nM being the calculated limit of detection. Analysis of the emission spectra and fluorescence lifetimes at varying Cu concentrations revealed that electron transfer from CsPbCl to Cu induced fluorescence quenching. CsPbCl:Mn exhibits a high relative sensitivity of 15.89 % K at 298 K, along with excellent reversibility. These findings highlight the potential application of CsPbCl:Mn PQDs in both temperature sensing and the analysis of wear metals in engine lubricating oils.
CsPbCl钙钛矿量子点（PQDs）的低光致发光量子产率（PLQY）对其作为离子检测探针的应用构成了重大挑战。为了解决这个问题，我们通过锰掺杂提高了CsPbCl PQDs的PLQY。然后将这些增强后的PQDs用作高灵敏度检测铜离子和温度的探针。通过热注入合成了具有不同Mn/Pb比的CsPbCl:Mn PQDs。锰掺杂引入了一个近600nm的发射带，其强度随着掺杂浓度的增加而增强。当Mn/Pb比为2.0时，PLQY提高了近10倍，从未掺杂的CsPbCl的5.46%提高到CsPbCl:Mn的52.48%。将具有最高PLQY的CsPbCl:Mn PQDs用作发光探针，利用荧光强度比（FIR）技术进行铜检测和温度传感。实验结果表明，在22.12 nM - 1600 nM范围内，FIR与铜浓度呈线性关系，22.12 nM为计算出的检测限。对不同铜浓度下的发射光谱和荧光寿命分析表明，电子从CsPbCl转移到铜会导致荧光猝灭。CsPbCl:Mn在298 K时具有15.89% K的高相对灵敏度以及出色的可逆性。这些发现突出了CsPbCl:Mn PQDs在温度传感和发动机润滑油中磨损金属分析方面的潜在应用。
