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

Akkerman QA, D'Innocenzo V, Accornero S, Scarpellini A, Petrozza A, Prato M, Manna L - J. Am. Chem. Soc. (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: †Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

ABSTRACT
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.

No MeSH data available.


Overview of the DifferentRoutes and Precursors for the Anion ExchangeReactions on CsPbX3 (X = Cl, Br, I) NCs Reported in ThisWork
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sch1: Overview of the DifferentRoutes and Precursors for the Anion ExchangeReactions on CsPbX3 (X = Cl, Br, I) NCs Reported in ThisWork


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

Akkerman QA, D'Innocenzo V, Accornero S, Scarpellini A, Petrozza A, Prato M, Manna L - J. Am. Chem. Soc. (2015)

Overview of the DifferentRoutes and Precursors for the Anion ExchangeReactions on CsPbX3 (X = Cl, Br, I) NCs Reported in ThisWork
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4543997&req=5

sch1: Overview of the DifferentRoutes and Precursors for the Anion ExchangeReactions on CsPbX3 (X = Cl, Br, I) NCs Reported in ThisWork
Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: †Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

ABSTRACT
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.

No MeSH data available.