Methylammonium lead bromide (CH₃NH₃PbBr₃) nanocrystals have great potentials for lighting and display applications. Previously we synthesized CH₃NH₃PbBr₃ nanocrystals using oleylamine as capping molecule and found that by increasing the oleylamine to CH₃NH₃PbBr₃ perovskite ratio (OPR), the photoluminescence wavelengths and morphology of CH₃NH₃PbBr₃ nanocrystals could be varied from 530 nm (green) platelets to 460 nm (blue) particles. Here we modified the synthesis to direct injection of precursors into toluene and found that increasing OPR not only changes the wavelength and morphology of nanocrystals but also the size of the unit cells.

甲基铵溴化铅（CH ₃ NH ₃ PbBr ₃）纳米晶体在照明和显示应用中具有巨大潜力。以前，我们以油胺为封端分子合成了CH ₃ NH ₃ PbBr ₃纳米晶体，发现通过提高油胺与CH ₃ NH ₃ PbBr ₃钙钛矿的比例（OPR），可以得到CH ₃ NH ₃ PbBr ₃的光致发光波长和形貌。纳米晶体可以从530 nm（绿色）血小板到460 nm（蓝色）颗粒变化。在这里，我们修改了合成方法，将前驱物直接注入甲苯中，发现增加的OPR不仅改变了纳米晶体的波长和形态，而且改变了晶胞的尺寸。