Waterproof perovskites: high fluorescence quantum yield and stability from a methylammonium lead bromide/formate mixture in water,Journal of Materials Chemistry C

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Waterproof perovskites: high fluorescence quantum yield and stability from a methylammonium lead bromide/formate mixture in water
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-03-24 , DOI: 10.1039/d0tc00383b
Yeasin Khan _{1,

2,

3,

4} , Yohan Ahn _{1,

2,

3,

4} , Hyuna Lee _{2,

4,

5,

6,

7} , Jaeki Jeong _{8,

9,

10,

11} , Yun Seop Shin _{8,

9,

10,

11} , Je Seung Lee _{1,

2,

3,

4} , Jang Hyuk Kwon _{2,

4,

5,

6,

7} , Jin Young Kim _{8,

9,

10,

11} , Hoon Sik Kim _{1,

2,

3,

4} , Jung Hwa Seo _{4,

12,

13,

14} , Bright Walker _{1,

2,

3,

4}

Affiliation

We’ve observed intense fluorescence from the surface of lead formate crystals when they are precipitated from a CH₃NH₃PbBr₃ (MAPbBr₃) perovskite precursor solution. The crystals exhibit emission in the range of 500–550 nm with a photoluminescence quantum yield (PLQY) of up to 70%. The fluorescence is stable in water and at elevated temperature without significant decrease in PLQY for months, conditions which instantly decompose MAPbBr₃. Fluorescence occurred with the highest quantum efficiency of 70% at an optimal 1 : 0.3 molar ratio of methylammonium formate and lead bromide and decreased rapidly for other ratios. Fluorescence was quenched using other halides (Cl or I) or other cations (Cs, ethylammonium, propylammonium, etc.). Single crystal analysis indicates that the material possesses the lead formate structure with lattice parameters which are identical to pristine lead formate, however, analysis of the particles by EDX, XPS and fluorescence microscopy confirms the presence of Br and fluorescence emission on the particle surfaces. The observed material characteristics indicate that the emissive species consists of a mixed-valence surface layer of Pb coordinated to both Br and formate ligands.

中文翻译：

防水钙钛矿：水中的甲基铵溴化铅/甲酸盐混合物具有很高的荧光量子产率和稳定性

我们已经观察到甲酸铅晶体从CH ₃ NH ₃ PbBr ₃（MAPbBr ₃）钙钛矿前体溶液中析出时，表面会发出强烈的荧光。晶体在500-550 nm范围内发射，光致发光量子产率（PLQY）高达70％。荧光在水中和高温下稳定，并且几个月内PLQY不会显着降低，该条件会立即分解MAPbBr ₃。在甲酸甲铵和溴化铅的最佳摩尔比为1：0.3的情况下，以最高量子效率70％发生荧光，而对于其他比率，荧光迅速下降。使用其他卤化物（Cl或I）或其他阳离子（Cs，乙基铵，丙基铵等）淬灭荧光。单晶分析表明该材料具有与原始甲酸铅相同的晶格参数的甲酸铅结构，但是，通过EDX，XPS和荧光显微镜对颗粒的分析证实了在颗粒表面上存在Br和荧光发射。观察到的材料特性表明，发射物质由与溴和甲酸配体配位的Pb混合价表面层组成。

更新日期：2020-03-24

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