Room-Temperature Synthesis of Widely Tunable Formamidinium Lead Halide Perovskite Nanocrystals
Room-Temperature Synthesis of Widely Tunable Formamidinium Lead Halide Perovskite Nanocrystals
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DOI：
10.1021/acs.chemmater.7b01705
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发表时间：
2017-07-11
影响因子：
8.6
通讯作者：
Kang, Youngjong M.
中科院分区：
文献类型：
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作者：
Duong Nguyen Minh;Kim, Juwon;Kang, Youngjong M.
以PbX 2-二甲基亚砜配合物为前驱体，采用配体辅助再沉淀法在室温下合成了基于甲脒卤化铅（FAPbX（3））的胶体钙钛矿纳米晶。已经获得了尺寸d接近10 nm的轮廓分明的α形FAPbX（3）纳米晶体。合成的FAPbX（3）纳米晶体显示出明亮的光致发光，具有高光致发光量子产率（FAPbBr（3）为75%）。测量了在几种不同离心速度下分离的样品的FAPbBr（3）纳米晶体的寿命。通过改变油胺的量或X的组成，可以将光致发光从蓝色区域调谐到近红外区域（λ（峰值）= 408-784 nm）。颜色表达范围为标准的135%。FAPbX（3）纳米晶体的光致发光光谱的带宽很窄（半峰全宽为18-48 nm）。FAPbX（3）纳米晶的热稳定性优于MAPbBr（3）纳米晶。
Colloidal perovskite nanocrystals based on formamidinium lead halide (FAPbX(3)) have been synthesized by the ligand-assisted reprecipitation method using PbX2-dimethyl sulfoxide complexes as precursors at room temperature. Well-defined cubicshaped FAPbX(3) nanocrystals have been obtained with a size d of similar to 10 nm. The synthesized FAPbX(3) nanocrystals show bright photoluminescence with a high photoluminescence quantum yield (75% for FAPbBr(3)). The lifetimes of FAPbBr(3) nanocrystals were measured for the samples isolated at several different centrifugal speeds. The photoluminescence can be tuned from the blue to near infrared region (lambda(peak) = 408-784 nm) by changing either the amount of oleylamine or the composition of X. The color expression range is 135% of the NTSC standard. The bandwidth of the photoluminescence spectra of FAPbX(3) nanocrystals is narrow (full width at half-maximum of 18-48 nm). FAPbX(3) nanocrystals show thermal stability that is better than that of MAPbBr(3) nanocrystals.