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Colors and Magnetism03:02

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 eye.

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Polytypic Zn-(In,Ga)-Se Nanocrystals with Tunable Emission.

Zhaohong Sun1, Nina Baluyot-Reyes1, Karla Zamarripa1,2

  • 1Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.

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|September 20, 2025
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Researchers synthesized novel wurtzite multinary chalcogenides using ZnSe templates via cation exchange. These new materials exhibit tunable optical properties from visible to near-infrared, expanding semiconductor research.

Keywords:
cation exchangedefect chalcopyritenanocrystalsphotoluminescencepolytypismwurtzite

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Polymorphism in chalcopyrite semiconductors is well-researched.
  • Wurtzite analogues of defect-chalcopyrite II-III2-VI4 compositions, like Zn(In,Ga)2(S,Se)4, are underexplored.
  • Understanding these materials is key to developing new optoelectronic devices.

Purpose of the Study:

  • To synthesize polytypic wurtzite multinary chalcogenides.
  • To explore their optical properties and tunability.
  • To establish a new synthetic route using cation exchange.

Main Methods:

  • Synthesis of Zn-(In,Ga)-Se multipods via cation exchange using ZnSe as a template.
  • Characterization of the multipods' structure and morphology (zinc-blende cores, wurtzite arms).
  • Optical characterization including absorption and photoluminescence spectroscopy, and temperature-dependent measurements.

Main Results:

  • Successful synthesis of polytypic Zn-(In,Ga)-Se multipods retaining ZnSe template structure.
  • Composition-dependent optical properties tunable from visible to near-infrared.
  • Strong low-temperature emission quenched near room temperature due to nonradiative processes.

Conclusions:

  • ZnSe serves as a versatile platform for cation exchange toward wurtzite multinary chalcogenides.
  • Novel structures with tunable optical properties are accessible.
  • This work opens avenues for new semiconductor materials with unique optoelectronic characteristics.