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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free indicator. The...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Solution-Processed OLED Based on a Mixed-Ligand Europium Complex.

Makarii I Kozlov1,2, Kirill M Kuznetsov2, Alexander S Goloveshkin3

  • 1Department of Chemistry, M.V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia.

Materials (Basel, Switzerland)
|February 11, 2023
PubMed
Summary
This summary is machine-generated.

Researchers enhanced europium-based organic light-emitting diodes (OLEDs) using mixed-ligand complexes. This approach significantly boosted OLED luminance, achieving high performance for solution-processed devices.

Keywords:
OLEDelectroluminescenceeuropiumlifetimemixed-ligand complex

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photochemistry

Background:

  • Europium complexes are promising for organic light-emitting diodes (OLEDs) due to their sharp emission spectra.
  • Improving the efficiency and luminance of solution-processed OLEDs remains a key challenge in the field.

Purpose of the Study:

  • To enhance the efficiency and luminance of europium-based OLEDs.
  • To investigate the effect of mixed-ligand complex formation on OLED performance.
  • To optimize solution deposition parameters for europium-based OLEDs.

Main Methods:

  • Synthesis of a series of novel europium mixed-ligand complexes.
  • Optimization of solution processing techniques, including host material selection.
  • Systematic variation of solvent and deposition parameters for device fabrication.
  • Characterization of device performance, focusing on luminance and stability.

Main Results:

  • A noticeable increase in OLED luminance was achieved through the mixed-ligand complex approach.
  • The maximum luminance reached up to 700 cd/m2, a high value for solution-processed europium OLEDs.
  • The stability of the optimized europium-based OLEDs was investigated.

Conclusions:

  • Mixed-ligand complex formation is an effective strategy to boost the performance of europium-based OLEDs.
  • Optimized solution processing significantly contributes to achieving high luminance in these devices.
  • The developed europium-based OLEDs demonstrate competitive performance for potential applications.