醋酸铅作为铅源合成CH3NH3PbBr3-xClx纳米晶体颗粒

摘要

采用醋酸铅作为铅源,成功制备出CH3NH3PbBr3-xClx(MA=CH3NH3,0≤x ≤ 3)发光纳米晶体颗粒.醋酸铅比卤化物铅盐,尤其是氯化铅,能更好地溶解在N'N-二甲基甲酰胺(DMF)溶剂中,解决了卤化物盐溶解度低的问题.在MAPbBr3-xClx中,不同比例的Br/Cl可以产生不同的光谱性质,荧光光谱(PL)可以从399 nm调控到527 nm.所有荧光光谱的半峰宽(FWHM)在20 nm左右,说明色谱比较纯.制备的MAPbBr3-xClx纳米晶体颗粒尺寸分布在～(11±3)nm,可以很好地分散在甲苯中.其中,MAPbBr3纳米晶体颗粒的荧光量子产率(PLQY)高达73％,其平均荧光寿命为97.4 ns.%Lead acetate,which is highly soluble in dimethylformamide,was used to synthesize mixed halide perovskite CH3NH3PbBr3-xClx (MA =CH3NH3,0 ≤ x ≤ 3) nanocrystals (NCs).This method provides an approach to address the low solubility of lead halides,especially lead chloride.Different Br/Cl ratios in MAPbBr3-xClx lead to various optical properties.The photoluminescence emission peak can be tuned from 399 to 527 nm.Their full-widths at half-maxima (FWHM) are about 20 nm.MAPbBr3-xClx NCs have an average diameter of ～(11 + 3) nm and have uniform dispersion in toluene.The MAPbBr3 NCs have a long average recombination lifetime (Tave =97.4 ns) and a photoluminescence quantum yield (PLQY) of up to 73％.