Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals
Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals
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单分散高亮度发光CsPbBr3/Cs4PbBr6钙钛矿复合纳米晶
DOI：
10.1039/c8nr01266k
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Wang Jing
中科院分区：
文献类型：
--
作者：
Xuan Tongtong;Lou Sunqi;Huang Junjian;Cao Luyu;Yang Xianfeng;Li Huili;Wang Jing
将CsPbBr 3纳米晶体（NC）嵌入到微米级Cs4 PbBr 6基质（CPB 113/CPB 416）中的微米级复合结构策略已经成功地证明了其解决由于量子限制的损失而导致的固体团聚状态下的钙钛矿NC的荧光猝灭的能力。然而，在固态下可控合成具有明亮发光的单分散纳米复合材料仍然是一个巨大的挑战。在这里，我们首次提出了一种新的过饱和重结晶过程，以可控地合成单分散的CPB 113/CPB 416复合纳米碳，在固体形式的明亮的发射，其中CsPbBr 3纳米碳均匀地嵌入在纳米六方Cs4 PbBr 6矩阵。2-甲基咪唑（MeIm）的存在不仅可以控制CsPbBr 3与Cs4 PbBr 6的组成比例、CsPbBr 3的尺寸和分散度，而且可以控制得到单分散的六方结构的Cs4 PbBr 6基体。所制备的复合结构能够有效地防止CsPbBr 3的荧光猝灭，并使复合纳米粒子具有高达83%的光致发光量子产率（PLQY）。此外，我们通过改变卤化物盐获得了可调谐的蓝色到红色发光复合纳米碳。
The microscale composite structure strategy of embedding CsPbBr3 nanocrystals (NCs) in the microscale Cs4PbBr6 matrix (CPB113/CPB416) has successfully demonstrated its ability to resolve the fluorescence quenching of perovskite NCs in the solid agglomeration state due to the loss of quantum confinement. Unfortunately, the controllable synthesis of monodisperse nanoscale composites with bright emission in the solid state remains a great challenge. Here, we present for the first time a novel supersaturated recrystallization process to controllably synthesize monodisperse CPB113/CPB416 composite NCs with bright emission in the solid form, where CsPbBr3 NCs were uniformly embedded in the nano hexagonal Cs4PbBr6 matrix. The existence of 2-methylimidazole (MeIm) not only can control the composition rate of CsPbBr3 to Cs4PbBr6, the size and dispersity of CsPbBr3 in the composite NCs but can also help controllably obtain the monodisperse and hexagonal Cs4PbBr6 matrix. The as-prepared composite structure can effectively prevent CsPbBr3 fluorescence quenching and make the composite NCs have a high photoluminescence quantum yield (PLQY) of 83%. In addition, we obtained tunable blue to red emitting composite NCs by varying the halide salts.