Wen Zhikai, Zhai Wei, Liu Chang, Lin Jing, Yu Chao, Huang Yang, Zhang Jun, Tang Chengchun
School of Materials Science and Engineering, Hebei University of Technology Tianjin 300130 P. R. China
Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology Tianjin 300130 P. R. China.
RSC Adv. 2019 Aug 12;9(43):24928-24934. doi: 10.1039/c9ra04600c. eCollection 2019 Aug 8.
So far the controllable synthesis of one-dimensional (1D) CsPbI nanocrystals still remains a challenge due to the fast reaction kinetics of the iodine system as compared with other halide perovskites. Here we report the direct synthesis of high-quality 1D CsPbI nanorods by a facile solvothermal method. The as-prepared CsPbI nanorods show high purity and uniform morphology with ultrafine diameters down to ∼5 nm. By simply changing the solvothermal reaction conditions, fine-tuning of the sizes of the CsPbI nanorods can be well achieved, which leads to the successful modulation of their photoluminescence (PL) emission. The solvothermal reaction offers relatively low crystal growth rate, which is of great importance for the size control of the CsPbI nanocrystals. PL quantum yields (PLQYs) and lifetime results indicate that the obtained nanorods maintain a good surface state over long reaction time. Our work not only provides a reliable means for the synthesis of 1D iodine-related perovskites, but also expands the study of size-related PL properties on perovskites nanocrystals.
与其他卤化物钙钛矿相比，由于碘体系的快速反应动力学，一维（1D）CsPbI纳米晶体的可控合成至今仍是一个挑战。在此，我们报道了通过一种简便的溶剂热法直接合成高质量的一维CsPbI纳米棒。所制备的CsPbI纳米棒显示出高纯度和均匀的形态，其超细直径低至约5nm。通过简单地改变溶剂热反应条件，可以很好地实现对CsPbI纳米棒尺寸的微调，这导致其光致发光（PL）发射的成功调制。溶剂热反应提供了相对较低的晶体生长速率，这对于CsPbI纳米晶体的尺寸控制非常重要。PL量子产率（PLQYs）和寿命结果表明，所获得的纳米棒在长时间反应中保持良好的表面状态。我们的工作不仅为合成一维碘相关钙钛矿提供了一种可靠的方法，还扩展了对钙钛矿纳米晶体尺寸相关PL性质的研究。
