In situ inclusion of thiocyanate for highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals
In situ inclusion of thiocyanate for highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals
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原位包合硫氰酸盐制备高发光且稳定的CH3NH3PbBr3钙钛矿纳米晶
DOI：
10.1039/c8nr07987k
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发表时间：
2019
期刊：
影响因子：
6.7
通讯作者：
Daoud Walid A.
中科院分区：
文献类型：
--
作者：
Cai Tao;Li Fan;Jiang Yihua;Liu Xueyuan;Xia Xuefeng;Wang Xiaofeng;Peng Jie;Wang Li;Daoud Walid A.
在这项工作中，在原位硫氰酸盐包合方法的高度发光和稳定的CH 3 NH3 PbBr 3钙钛矿纳米晶体（NC）的制造开发，采用Pb（SCN）2作为铅前体，部分或全部取代PbBr 2在配体辅助再沉淀（LARP）过程。原位合成方法不仅避免了杂质元素的引入，更有趣的是，硫氰酸盐的引入可以简单有效地控制CH 3 NH3 PbBr 3纳米粒子的结晶度、粒径、发光和稳定性。通过调节硫氰酸盐的浓度，合成的CH 3 NH3 PbBr 3 NCs的光致发光（PL）可以在473-526 nm的范围内调谐，其特征在于21-28 nm的窄发射线宽和73%至96%的突出的光致发光量子产率（PLQY）。同时，随着硫氰酸盐用量的增加，CH_3NH_3PbBr_3纳米粒子的稳定性得到了显著提高。CH_3NH_3PbBr_3纳米晶体的光学性能和稳定性的改善主要是由于硫氰酸盐的存在导致的更高的结晶度和更稳定且无缺陷的表面钝化的贡献。该工作为制备高发光、高稳定性的CH 3 NH3 PbBr 3纳米碳管提供了一条新的途径。
In this work, an in situ thiocyanate inclusion method for the fabrication of highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals (NCs) is developed, employing Pb(SCN)2 as the lead precursor to partially or totally replace PbBr2 in the ligand-assisted reprecipitation (LARP) process. The in situ approach not only avoids the introduction of impurity elements, but also more interestingly incorporation of thiocyanate can control the crystallinity, particle size, luminescence and stability of CH3NH3PbBr3 NCs in a simple and effective manner. By adjusting the thiocyanate concentration, the photoluminescence (PL) of the synthesized CH3NH3PbBr3 NCs can be tuned in a range of 473–526 nm, as characterized by narrow emission line widths of 21–28 nm and outstanding photoluminescence quantum yields (PLQYs) of 73% to 96%. Meanwhile, the stability of CH3NH3PbBr3 NCs can be greatly improved as the amount of thiocyanate increases. The improvement in the optical performance and stability of CH3NH3PbBr3 NCs is mainly due to the contribution of higher crystallinity and, more stable and defect-free surface passivation induced by the presence of thiocyanate. This work paves a novel way for preparing highly luminescent and stable CH3NH3PbBr3 NCs.