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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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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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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Compact spin-valley-locked perovskite emission.

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  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore.

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Researchers developed compact perovskite metasurfaces for chiral light emission. This breakthrough enables pure circular polarization with high directionality and large emission angles, advancing chiroptics and photonics applications.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Circularly polarized light is crucial for chiroptics, spintronics, and photocatalysis.
  • Existing compact emitters struggle with pure circular polarization, high directionality, and large emission angles.
  • Metal-halide perovskites show promise but lack intrinsic spin-locking for chirality, and integration issues hinder performance.

Purpose of the Study:

  • To realize compact, spin-valley-locked perovskite emitting metasurfaces.
  • To overcome limitations in achieving pure circular polarization, high directionality, and large emission angles simultaneously.
  • To enable advanced applications in chiral optoelectronics.

Main Methods:

  • Engineered perovskite metasurfaces with spin-dependent geometric phases.
  • Utilized bound states in the continuum via Brillouin zone folding.
  • Achieved selective addressing of photon spins to opposite valleys.

Main Results:

  • Simultaneously achieved high chiral purity (0.91) and a large emission angle (41.0°).
  • Demonstrated a low beam divergence angle of 1.6°.
  • Created compact, efficient chiral light emitters.

Conclusions:

  • The developed spin-valley-locked perovskite metasurfaces offer a novel platform for chiral light generation.
  • This approach paves the way for chiral light-emitting diodes and on-chip entangled photon pair generation.
  • Enables advancements in compact, high-performance chiroptical devices.