Employing Polar Solvent Controlled Ionization in Precursors for Synthesis of High‐Quality Inorganic Perovskite Nanocrystals at Room Temperature,Advanced Functional Materials

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Employing Polar Solvent Controlled Ionization in Precursors for Synthesis of High‐Quality Inorganic Perovskite Nanocrystals at Room Temperature
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-10 , DOI: 10.1002/adfm.201706000
Fan Fang _{1,

2} , Wei Chen ₁ , Yang Li ₂ , Haochen Liu ₁ , Ming Mei ₂ , Ruan Zhang ₁ , Junjie Hao ₁ , Marus Mikita ₁ , Wanqiang Cao ₂ , Ruikun Pan ₂ , Kai Wang ₁ , Xiao Wei Sun ₁

Affiliation

All inorganic cesium lead halide (CsPbX₃, X = Cl, Br, I) perovskite nanocrystals (PeNCs) are synthesized by employing polar solvent controlled ionization (PCI) method in precursors. The new strategy can be easily carried out at room temperature and allow to employ smaller amount of weaker polarity and a broader range of low‐boiling low‐toxic solvents. The as prepared CsPbX₃ PeNCs reveal tunable emission spectra from 380 to 700 nm and high quantum yields over 80% with narrow full width at half maximum (FWHM). Meanwhile, larger “effective Stokes shifts” of PeNCs in PCI method, which enlarges 200% more than other PeNCs in regular methods, are observed. Most interestingly, the PeNCs growth process is coupling with some typical crystals formations. The main morphologies of CsPbI₃ PeNCs are hybrid of nanorods and nanoparticles. The primary morphologies of CsPbBr_xI_3‐_x and CsPbBr₃ PeNCs are nanowires, which are supposed to have great potentials for applying in laser arrays and highly sensitive photodetector applications. Furthermore, such superior optical is endowed to fabricate white light emitting diodes, which has wide color gamut covering up to 120% of the National Television Systems Committee color standard.

中文翻译：

在前体中采用极性溶剂控制的电离在室温下合成高质量的无机钙钛矿纳米晶体

通过在前体中采用极性溶剂控制电离（PCI）方法合成了所有无机卤化铯铯（CsPbX ₃，X = Cl，Br，I）钙钛矿纳米晶体（PeNCs）。新策略可以在室温下轻松实施，并允许使用少量的弱极性溶剂和范围更广的低沸点低毒性溶剂。所制备的CsPbX ₃ PeNCs揭示了380至700 nm的可调发射光谱，超过80％的高量子产率，且半峰全宽（FWHM）狭窄。同时，观察到PCI方法中PeNC的较大“有效斯托克斯位移”，比常规方法中的其他PeNC大200％。最有趣的是，PeNCs的生长过程与一些典型的晶体形成有关。CsPbI的主要形态₃ PeNC是纳米棒和纳米颗粒的混合物。CsPbBr _x I _3-_x和CsPbBr ₃ PeNC的主要形态是纳米线，据认为它们在激光阵列和高灵敏度光电探测器应用中具有巨大的潜力。此外，这种优异的光学特性被赋予了制造白色发光二极管的效果，该白色发光二极管具有广泛的色域，覆盖高达国家电视系统委员会颜色标准的120％。

更新日期：2018-01-10

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