Related Experiment Video
Updated: Sep 14, 2025
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.1K
Designer Sulfonium-Based Capping Ligands for Lead Halide Perovskite Nanocrystals.
Oleksandr Kolomiiets1,2, Andriy Stelmakh1,2, Amrutha Rajan1,2
1Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland.
ACS Nano
|July 22, 2025
Summary
New trialkylsulfonium ligands enhance lead halide perovskite nanocrystals (LHP NCs) for light applications. These ligands improve photoluminescence quantum yields and enable stable, highly concentrated colloids for advanced photonics and displays.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Lead halide perovskite nanocrystals (LHP NCs) are promising for light-emitting applications.
- Developing effective capping ligands is crucial for enhancing LHP NC performance and stability.
Purpose of the Study:
- To introduce and evaluate a novel library of long-chain trialkylsulfonium ligands for LHP NCs.
- To understand the structure-property relationships governing ligand binding and nanocrystal performance.
Main Methods:
- Synthesis of diverse trialkylsulfonium ligands.
- Surface passivation of CsPbBr3 and MAPbBr3 nanocrystals.
- Photoluminescence quantum yield measurements.
- Classical force-field molecular dynamics simulations.
- Characterization of colloidal stability and single-photon emission properties.
Main Results:
- Trialkylsulfonium ligands achieve high photoluminescence quantum yields (approaching 90% for cationic, exceeding 90% for zwitterionic).
- Ligand conformational flexibility is key to binding strength, outperforming headgroup geometry.
- Zwitterionic ligands yield robust colloids with suppressed blinking (on-time fraction ~85%) and high single-photon purity (g2(0) = 0.12).
- Sulfonium ligands stabilize highly concentrated NC colloids (1.1 g/mL).
Conclusions:
- Trialkylsulfonium ligands offer robust surface passivation for LHP NCs.
- These ligands enable practical applications in quantum photonics and display technologies.
- The findings establish sulfonium-based ligands as a viable alternative for advanced LHP NC applications.
More Related Videos
Related Concept Videos
02:42Valence Bond Theory
9.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.7K
02:51Metal-Ligand Bonds
21.5K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.5K
02:26Preparation and Reactions of Sulfides
5.1K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.1K
02:54Coordination Compounds and Nomenclature
22.2K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
22.2K
02:58Crystal Field Theory - Octahedral Complexes
27.9K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
27.9K