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Related Concept Videos

Colors and Magnetism03:02

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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...
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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...
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Ionic Crystal Structures

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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.
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Valence Bond Theory02:42

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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...
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Tetrahedral Complexes
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Updated: Dec 12, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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A Highly Efficient and Stable Blue-Emitting Cs5 Cu3 Cl6 I2 with a 1D Chain Structure.

Jiangwei Li1, Takeshi Inoshita1,2, Tianping Ying1

  • 1Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-1, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.

Advanced Materials (Deerfield Beach, Fla.)
|August 8, 2020
PubMed
Summary

Researchers discovered a new lead-free emitter, Cs5Cu3Cl6I2, for photonics applications. This material offers high photoluminescence quantum yield (PLQY) and enhanced air stability, paving the way for advanced optical devices.

Keywords:
Cs 5Cu 3Cl 6I 2Pb-free luminescent halidesair stabilityhigh PLQYmixed anions

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Area of Science:

  • Photonics and Materials Science
  • Inorganic Chemistry
  • Luminescence

Background:

  • Alkali copper(I) halides are promising lead-free emitters in photonics due to quantum confinement effects.
  • Cs3Cu2I5 exhibits high photoluminescence quantum yield (PLQY) and air stability, but new materials are sought.
  • Developing stable, efficient, lead-free luminescent materials is crucial for next-generation optical technologies.

Purpose of the Study:

  • To explore novel alkali copper(I) halide compounds using mixed-anion strategies for improved luminescence and stability.
  • To synthesize and characterize new materials with potential for high photoluminescence quantum yields (PLQYs) and air stability.
  • To investigate the relationship between crystal structure, electronic properties, and luminescence in mixed-halide systems.

Main Methods:

  • Mixed-anion synthesis strategy utilizing iodide (I-) and chloride (Cl-) ions.
  • Structural characterization of the novel compound.
  • Photoluminescence quantum yield (PLQY) measurements.
  • Electronic structure calculations.
  • Chemical stability assessments.

Main Results:

  • Discovery of a new compound, Cs5Cu3Cl6I2, featuring a 1D zigzag chain structure.
  • Observation of efficient blue emission (≈462 nm) with a near-unity quantum yield of 95%.
  • Electronic structure calculations indicated localized valence band maximum contributing to efficient self-trapped exciton emission.
  • Enhanced chemical stability of Cs5Cu3Cl6I2 due to iodine-bridged 1D connectivity compared to pure chloride phases.

Conclusions:

  • Cs5Cu3Cl6I2 represents a novel, air-stable, lead-free emitter with highly efficient blue luminescence.
  • The mixed-anion approach is effective in discovering new materials with desirable optoelectronic properties.
  • This work provides a new avenue for designing stable and efficient alkali copper(I) halide-based luminescent materials.