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采用醋酸铅作为铅源,成功制备出CH_3NH_3PbBr_(3-x)Cl_x(MA=CH_3NH_3,0≤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MAPbBr_(3-x)Cl_x中,不同比例的Br/CI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MAPbBr_(3-x)Cl_x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,MAPbBr_3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。
Using lead acetate as a lead source, the nanocrystalline CH_3NH_3PbBr_ (3-x) Cl_x (MA = CH_3NH_3,0≤x≤3) luminescent nanocrystal particles were successfully prepared. Lead acetate is more soluble in N’N-dimethylformamide (DMF) solvents than halide lead salts, especially lead chloride, and solves the problem of low solubility of halide salts. In MAPbBr_ (3-x) Cl_x, different ratios of Br / CI can produce different spectral properties, and the fluorescence spectrum (PL) can be regulated from 399 nm to 527 nm. The full width at half maximum (FWHM) of all fluorescence spectra is around 20 nm, indicating purer chromatograms. The size distribution of the prepared MAPbBr_ (3-x) Cl_x nanocrystals is ~ (11 ± 3) nm and can be well dispersed in toluene. Among them, the fluorescence quantum yield (PLQY) of MAPbBr_3 nanocrystal particles was as high as 73% with an average fluorescence lifetime of 97.4 ns.