In situ tetrafluoroborate-modified MAPbBr3 nanocrystals showing high photoluminescence, stability and self-assembly behavior,Journal of Materials Chemistry C

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In situ tetrafluoroborate-modified MAPbBr3 nanocrystals showing high photoluminescence, stability and self-assembly behavior
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9tc04978a
Xiao Yang _{1,

2,

3,

4} , Fan Li _{1,

2,

3,

4} , Xiaofeng Wang _{1,

2,

3,

4} , Yifei Xu _{1,

2,

3,

4} , Haoliang Wei _{1,

2,

3,

4} , Li Wang _{1,

2,

3,

4}

Affiliation

In this work, we present a facile and effective protocol, the in situ tetrafluoroborate modification route, to improve the photoluminescence and stability of CH₃NH₃PbBr₃ (MAPbBr₃) nanocrystals by directly introducing tetrafluoroborate salts into the precursor solutions in the LARP process. It is found that the incorporation of tetrafluoroborate can control the optical properties and morphologies of the MAPbBr₃ nanocrystals. By adjusting the amount of BF₄⁻, the MAPbBr₃ nanocrystals with tunable emission (480–525 nm) and high photoluminescence are acquired. Simultaneously, the stability of the MAPbBr₃ nanocrystals can also be greatly improved via in situ tetrafluoroborate modification. More interestingly, the introduction of BF₄⁻ can induce the self-assembly crystal growth behavior of the MAPbBr₃ nanocrystals, which exhibit orderly alignment and oriented self-assemblies. Such amazing results are primarily ascribed to the passivation of surface defects, the presence of a stable organic–inorganic hybrid ligand layer and formation of hydrogen bonding between BF₄⁻ and MA⁺ upon in situ incorporation of tetrafluoroborate.

中文翻译：

原位四氟硼酸酯修饰的MAPbBr3纳米晶体显示出高的光致发光，稳定性和自组装行为

在这项工作中，我们提出了一种简便有效的方案，即原位四氟硼酸盐修饰途径，通过在LARP工艺中将四氟硼酸盐直接引入前体溶液中来改善CH ₃ NH ₃ PbBr ₃（MAPbBr ₃）纳米晶体的光致发光和稳定性。。发现四氟硼酸盐的掺入可以控制MAPbBr ₃纳米晶体的光学性质和形态。通过调整BF的量₄^-时，MAPbBr ₃纳米晶体具有可调谐发射（480-525纳米）和光致发光高获取。同时，MAPbBr ₃的稳定性纳米晶体也可以通过原位四氟硼酸酯改性得到极大改善。更有趣的是，引进的BF ₄^-可诱导MAPbBr的自组装的晶体生长行为₃纳米晶体，其显示出有序的对准和面向自组装。这种惊人的效果主要是归因于表面缺陷的钝化，稳定的有机-无机杂化配体层和形成BF之间的氢键的存在₄^-和MA ⁺在原位四氟硼酸盐的掺入。

更新日期：2020-02-13

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