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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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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Coordination-Constraint-Driven Enhanced Chirality Induction in Perovskite Quantum Dot Solids.

Cong Geng1, Ruiyang Yin2, Wenda Sun3

  • 1State Key Laboratory of Advanced Chemical Power Sources, Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Academy for Advanced Interdisciplinary Studies, College of Chemistry, Nankai University, Tianjin 300071, China.

Journal of the American Chemical Society
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed chiral perovskite quantum dot (CPQD) thin films using surface coordination. These films show enhanced chirality and conductivity, paving the way for advanced spin-optoelectronic devices.

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Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Optoelectronics

Background:

  • Perovskite quantum dots (PQDs) are attractive for chiroptical applications due to their unique properties.
  • Efficient chirality induction in solid-state chiral PQD (CPQD) thin films is a significant challenge.

Purpose of the Study:

  • To develop a strategy for enhancing chirality induction and lattice asymmetry in PQD solids.
  • To explore the potential of CPQDs in spin-optoelectronic devices.

Main Methods:

  • Synthesis-on-substrate approach to create CsPbBr3 CPQD thin films with controlled chiral ligand coverage.
  • Density functional theory (DFT) calculations to investigate ligand-surface interactions.
  • Fabrication and characterization of spin light-emitting diodes (LEDs).

Main Results:

  • Achieved CPQD films with exclusive chiral ligand coverage and well-defined ligand-surface interactions.
  • Demonstrated that ligand coordination geometry, not density, dictates asymmetric surface interaction strength.
  • CPQD films exhibited high photoluminescence dissymmetry factors (>10⁻²) and combined chirality-induced spin selectivity with high electrical conductivity.
  • Spin LEDs based on CPQD films achieved a 0.15 electroluminescence dissymmetry factor and 17.9% external quantum efficiency.

Conclusions:

  • Sterically constrained surface coordination is an effective strategy for chirality transfer in PQDs.
  • The coordination environment plays a crucial role in achieving strong asymmetric interactions at the PQD surface.
  • CPQDs show significant promise for next-generation spin-optoelectronic applications.