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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Valence Bond Theory

Valence Bond Theory

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...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

Structures of Solids

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Related Experiment Video

Updated: Jul 1, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

All-Perovskite Multicomponent Nanocrystal Superlattices.

Taras V Sekh^1,2, Ihor Cherniukh^1,2, Etsuki Kobiyama³

¹Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.

|March 6, 2024

Summary

This summary is machine-generated.

Researchers created novel multicomponent nanocrystal superlattices using only lead halide perovskite nanocrystals of varying sizes. These structures exhibit controlled energy transfer and enhanced exciton transport for advanced quantum optoelectronics.

Keywords:

energy transfer exciton diffusion lead halide perovskites nanocrystal coupling nanocrystals superfluorescence superlattices

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Area of Science:

Materials Science
Nanoscience
Quantum Optics

Background:

Nanocrystal superlattices (NC SLs) are promising metamaterials with emergent properties from constituent nanocrystals (NCs).
Lead halide perovskite (LHP) NCs show collective light emission (superfluorescence) and are ideal for SLs.
Previous LHP NC SLs were single-component or coassembled with dielectric spacers.

Purpose of the Study:

To report the formation of multicomponent LHP NC-only superlattices using CsPbBr₃ NCs of different sizes.
To investigate the structural diversity, NC coupling, and energy transfer mechanisms in these novel SLs.
To explore the potential of these materials for quantum optoelectronic devices.

Main Methods:

Synthesis of multicomponent NC SLs using CsPbBr₃ NCs of different sizes.
Structural characterization of the obtained SLs (ABO₆, ABO₃, NaCl types).
Spectroscopic measurements (Förster-like energy transfer) and spatiotemporal exciton dynamics.

Main Results:

Formation of diverse LHP NC-only SLs with orientationally and positionally locked NCs.
Observed efficient energy transfer from smaller (5.3 nm) to larger (17.6 nm) CsPbBr₃ NCs in ABO₆-type SLs.
Demonstrated enhanced exciton diffusivity in binary SLs compared to single-component assemblies across a wide temperature range (5–298 K).

Conclusions:

Multicomponent LHP NC-only SLs can be fabricated with controlled structural diversity.
Efficient NC coupling and energy transfer are achievable within these all-perovskite systems.
These findings pave the way for advanced quantum optoelectronic devices leveraging tunable excitonic transport.