Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions

被引：1888

作者：

Akkerman, Quinten A. ^{[1
]}

D'Innocenzo, Valerio ^{[2
]}

Accornero, Sara ^{[1
]}

Scarpellini, Alice ^{[1
]}

Petrozza, Annamaria ^{[2
]}

Prato, Mirko ^{[1
]}

Manna, Liberato ^{[1
]}

机构：

[1] Ist Italian Tecnol, Nanochem Dept, I-16163 Genoa, Italy

[2] Ist Italian Tecnol, Ctr Nano Sci & Technol Polimi, I-20133 Milan, Italy

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2015年 / 137卷 / 32期

关键词：

SOLAR-CELLS; EFFICIENT; EMISSION; BR; CL;

D O I：

10.1021/jacs.5b05602

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate that, via controlled anion exchange reactions using a range of different halide precursors, we can finely tune the chemical composition and the optical properties of presynthesized colloidal cesium lead halide perovskite nanocrystals (NCs), from green emitting CsPbBr3 to bright emitters in any other region of the visible spectrum, and back, by displacement of Cl- or I- ions and reinsertion of Br- ions. This approach gives access to perovskite semiconductor NCs with both structural and optical qualities comparable to those of directly synthesized NCs. We also show that anion exchange is a dynamic process that takes place in solution between NCs. Therefore, by mixing solutions containing perovskite NCs emitting in different spectral ranges (due to different halide compositions) their mutual fast exchange dynamics leads to homogenization in their composition, resulting in NCs emitting in a narrow spectral region that is intermediate between those of the parent nanoparticles.

引用

页码：10276 / 10281

页数：6

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