In the present work, we report the growth of all-inorganic perovskite nanorings with dual compositional phases of CsPbBr₃ and CsPb₂Br₅ via a facile hot injection process. The self-coiling of CsPbBr₃-CsPb₂Br₅ nanorings is driven by the axial stress generated on the outside surface of the as-synthesized nanobelts, which results from the lattice mismatch during the transformation of CsPbBr₃ to CsPb₂Br₅. The tailored growth of nanorings could be achieved by adjusting the key experimental parameters such as reaction temperature, reaction time and stirring speed during the cooling process. The photoluminescence intensity and quantum yield of nanorings are higher than those of CsPbBr₃ nanobelts, accompanied by a narrower full width at half maximum (FWHM), suggesting their high potential for constructing self-assembled optoelectronic nanodevices.

在目前的工作中，我们报告了通过简便的热注射工艺，具有CsPbBr ₃和CsPb ₂ Br ₅双重组成相的全无机钙钛矿纳米环的生长。CsPbBr ₃ -CsPb ₂ Br ₅纳米环的自卷是由合成纳米带外表面上产生的轴向应力驱动的，该轴向应力是由CsPbBr ₃转变为CsPb ₂ Br _5时的晶格失配引起的。通过调节关键的实验参数，例如冷却过程中的反应温度，反应时间和搅拌速度，可以实现纳米环的定制生长。纳米环的光致发光强度和量子产率均高于CsPbBr ₃纳米带，并具有更窄的半峰全宽（FWHM），表明它们具有构建自组装光电纳米器件的巨大潜力。