Fo Bai,Zhengtong Wang,Xiaohui Liu,Junhuan Zhao,Zhongjie Zhai,Chun Sun
In this study, we employed a modified ligand-assisted recrystallization precipitation (LARP) method to synthesize perovskite nanomaterials with emission peaks ranging from 515 nm to 683 nm. The synthesis of these nanomaterials with different emission peaks was achieved by simply controlling the type and amount of cesium oleate. These CsPbI 3 nanomaterials possess different morphologies, and all of them show excellent PL properties. Furthermore, by simply mixing the nanomaterials with sodium citrate, a large quantity of powders of various colors was obtained, which can be used for the fabrication of multicolor patterns.
Although great advancements have been successfully achieved in ligand-assisted reprecipitation strategy (LARP) towards lead halide perovskite nanocrystals (NCs) synthesis, it still remains challenging to develop bright and stable iodide-based perovskite NC via facile LARP. Herein, strikingly bright MAPbI 3 NCs with photoluminescence quantum yield (PLQY) as high as 79% are synthesized via replacing the raw material (MAI and PbI 2 ) with MAPbI 3 crystal powder during LARP procedure. It has been found that crystal powder derived MAPbI 3 NCs are more iodide-rich compared with that based on raw material, which is favorable to passivate the surface trap state. Accordingly, femtosecond transient absorption spectroscopies and space charge limited current measurements have corroborated that the trap density is much less in crystal powder resulted MAPbI 3 NCs. Further analyses indicate stronger solvation with reduced precursor colloid size has been observed in crystal powder derived precursor solution probably due to the formation of MAPbI 3 ·DMF. This work has provided a facile but valid method to enhance the photoluminescence of perovskite NC via modulating the beginning precursor solution.
Shuoshuo Zang,Jianli Chen,Yan Yu,Xuegao Qin,Hewen Liu
Ligand-assisted reprecipitation (LARP) is a facile room-temperature synthesis method suitable for the mass production of perovskite nanocrystals (NCs). However, it encounters serious problems such as low product yields and poor quality. Here, a polymer ligand (P-AMDL) is designed and synthesized composed of four monomers of 2-acrylamido-2-methylpropanesulfonic acid (A), methyl methacrylate (M), 2-(dimethylamino) ethyl methacrylate (D), and lauryl methacrylate (L). Sulfonic acid groups, amide groups, and ester groups provide multiple binding sites for P-AMDL, and long alkyl chains can improve the hydrophobicity and redispersion ability. CsPbBr3 NCs of high quality (PLQY > 90%) are synthesized by P-AMDL-assisted reprecipitation in toluene. Even at a high proportion of precursor/toluene (∼1/1 v/v), CsPbBr3 NCs are still obtained in high yield, which is conducive to reducing the use of organic solvents. A scale-up synthesis of well-dispersed CsPbBr3 NCs proves that P-AMDL can avoid a wide particle size distribution caused by mixing and diffusion. After having been stored in the solid state for 100 days, P-AMDL-stabilized CsPbBr3 NCs can still be redispersible in toluene and recover the original PL properties (PLQY > 90%), which provides a safe and convenient way for solid storage and transportation of CsPbBr3 NCs.
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