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Related Concept Videos

Halogens03:01

Halogens

18.5K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

6.0K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

42.3K
Effect of Lone Pairs of Electrons on Molecule Geometry
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Ionic Crystal Structures02:42

Ionic Crystal Structures

14.3K
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...
14.3K

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Related Experiment Video

Updated: Jul 4, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Silver/Antimony-Base Multifunctional Double Perovskite with H/F Substitution Enhance Properties.

Ming-Yang Wan1, Wei-Fei Liu1, Jin Lin Luo1

  • 1Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, PR China.

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|January 26, 2024
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New two-dimensional double perovskites show tunable optoelectronic properties and bistable switching. H/F substitution enhances phase transition temperature and band gap, offering insights into multifunctional material development.

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Two-dimensional (2D) double perovskites are rapidly advancing due to their unique optoelectronic properties and structural diversity.
  • Challenges remain in synthesizing high-performance multifunctional compounds and precisely controlling their properties.

Purpose of the Study:

  • To synthesize novel multifunctional 2D double perovskite compounds.
  • To investigate the impact of hydrogen/fluorine (H/F) substitution on material properties.
  • To explore the emission mechanisms and potential applications of these compounds.

Main Methods:

  • Synthesis of two new compounds: (C6H14N)4AgSbBr8 (1) and (F2-C6H12N)4AgSbBr8 (2).
  • Characterization of solid-state phase transition temperature and dielectric properties.
  • Investigation of optical properties, including second harmonic generation (SHG) and photoluminescence.
  • First-principles calculations and variable-temperature fluorescence spectroscopy to elucidate emission mechanisms.

Main Results:

  • Successfully synthesized two multifunctional 2D double perovskites with high solid-state phase transition temperatures.
  • Demonstrated bistable dielectric constant switching and significant second harmonic generation (SHG).
  • Achieved bright emission, with H/F substitution increasing transition temperature and reducing band gap due to decreased interlayer spacing.
  • Confirmed the presence of self-trapped exciton emission (STE1) as the broad emission mechanism.

Conclusions:

  • The synthesized compounds exhibit promising multifunctional properties for advanced applications.
  • H/F substitution is an effective strategy for tuning phase transition temperatures and electronic band gaps in 2D double perovskites.
  • Understanding the emission mechanism provides a foundation for designing next-generation optoelectronic materials.