Hu Yue, Zhang Xinyue, Yang Chaoqun, Li Ji, Wang Li
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University Siping 136000 China
National Demonstration Center for Experimental Physics Education, Jilin Normal University Siping 136000 China.
RSC Adv. 2019 Oct 16;9(57):33017-33022. doi: 10.1039/c9ra07069a. eCollection 2019 Oct 15.
All inorganic halide perovskite nanocrystals (NCs) have wider practical applications owing to their good properties, whereas the photoluminescence quantum yield (PLQY) of the purple emissive CsPbCl NCs is too low to apply in multi-color displays. In this study, earth-abundant Fe metal ions were successfully incorporated into the lattice of CsPbCl NCs with the partial replacement of the sites of Pb ions. The impacts of Fe ions on the luminescence and magnetic properties of CsPbCl NCs were studied using photoluminescence spectroscopy (PL), X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), and a vibrating sample magnetometer (VSM). CsPb Fe Cl NCs, with = 0, 0.1, 0.2, and 0.3, were synthesized at 170 °C. It was found that an appropriate amount of Fe doping not only improved the homogeneity of the size of NCs, but also enhanced the PLQY and average PL lifetimes. An obvious hysteresis behavior was observed for the NCs, and there was a significant change in the saturation magnetization value with the increase in the Fe concentration.
由于其良好的性能，所有无机卤化物钙钛矿纳米晶体（NCs）都有更广泛的实际应用，然而紫色发光的CsPbCl NCs的光致发光量子产率（PLQY）太低，无法应用于多色显示器。在本研究中，储量丰富的铁金属离子成功地掺入到CsPbCl NCs的晶格中，部分取代了Pb离子的位点。使用光致发光光谱（PL）、X射线衍射光谱（XRD）、透射电子显微镜（TEM）、场发射扫描电子显微镜（FE-SEM）和振动样品磁强计（VSM）研究了Fe离子对CsPbCl NCs发光和磁性的影响。在170℃下合成了x = 0、0.1、0.2和0.3的CsPb₁₋ₓFeₓCl₃ NCs。发现适量的Fe掺杂不仅提高了NCs尺寸的均匀性，还提高了PLQY和平均PL寿命。观察到NCs有明显的磁滞行为，并且随着Fe浓度的增加，饱和磁化强度值有显著变化。
