Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions
Open Access
- 27 July 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 137 (32), 10276-10281
- https://doi.org/10.1021/jacs.5b05602
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.Funding Information
- Fondazione Cariplo (2013-0656)
- European Research Council (614897)
This publication has 26 references indexed in Scilit:
- High-performance photovoltaic perovskite layers fabricated through intramolecular exchangeScience, 2015
- Colloidal Organohalide Perovskite Nanoplatelets Exhibiting Quantum ConfinementThe Journal of Physical Chemistry Letters, 2015
- Lead halide perovskite nanowire lasers with low lasing thresholds and high quality factorsNature Materials, 2015
- Brightly Luminescent and Color-Tunable Colloidal CH3NH3PbX3 (X = Br, I, Cl) Quantum Dots: Potential Alternatives for Display TechnologyACS Nano, 2015
- Compositional engineering of perovskite materials for high-performance solar cellsNature, 2015
- Maximizing the emissive properties of CH3NH3PbBr3 perovskite nanoparticlesJournal of Materials Chemistry A, 2014
- Bright light-emitting diodes based on organometal halide perovskiteNature Nanotechnology, 2014
- High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite SemiconductorsThe Journal of Physical Chemistry Letters, 2014
- Low-temperature solution-processed wavelength-tunable perovskites for lasingNature Materials, 2014
- Nontemplate Synthesis of CH3NH3PbBr3 Perovskite NanoparticlesJournal of the American Chemical Society, 2014