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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Ionic Crystal Structures02:42

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...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Ionic Radii03:10

Ionic Radii

Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Related Experiment Video

Updated: May 29, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Iridium(III) soft salts from dinuclear cationic and mononuclear anionic complexes for OLED devices.

Gihane Nasr1, Audrey Guerlin, Frédéric Dumur

  • 1Institut Lavoisier de Versailles, UMR 8180 CNRS, Université de Versailles Saint Quentin en Yvelines, 45 av. des Etats-Unis, 78035 Versailles, France.

Chemical Communications (Cambridge, England)
|September 6, 2011
PubMed
Summary

New iridium(III) soft salts were developed as phosphorescent emitters for organic light-emitting diodes (OLEDs). The best performing devices utilized a soft salt with a carbazole ligand for improved performance.

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Development of Efficient OLEDs from Solution Deposition
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Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

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Last Updated: May 29, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Area of Science:

  • Materials Science
  • Chemistry
  • Organic Electronics

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for modern display technology.
  • Developing efficient phosphorescent emitters is key to improving OLED performance.
  • Solution processing offers a cost-effective alternative to vacuum deposition for OLED fabrication.

Purpose of the Study:

  • To design and investigate novel iridium(III) soft salts as phosphorescent emitters for solution-processed OLEDs.
  • To explore the impact of different bridging ligands on the properties of dinuclear cationic complexes.
  • To identify the optimal soft salt composition for high-performance OLED devices.

Main Methods:

  • Synthesis of dinuclear cationic iridium(III) complexes with carbazole and phenylene bridging ligands.
  • Formation of ion-paired soft salts with mononuclear anionic counterions.
  • Fabrication and characterization of solution-processed OLED devices incorporating the synthesized emitters.

Main Results:

  • Two types of iridium(III) soft salts were successfully synthesized and characterized.
  • Dinuclear cationic complexes featuring a carbazole moiety exhibited superior performance in OLED devices.
  • The soft salt with the carbazole bridging ligand demonstrated enhanced phosphorescent emission properties.

Conclusions:

  • Iridium(III) soft salts are promising candidates for phosphorescent emitters in solution-processed OLEDs.
  • The choice of bridging ligand significantly influences the optoelectronic properties and device performance.
  • Soft salts incorporating carbazole ligands represent a highly effective strategy for developing efficient OLED materials.