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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Two-Dimensional Chiral Perovskites for Integrated High-Performance Ultraviolet Full-Stokes Polarization Detection.

Zhirong Liu1, Tianyu Sun1, Xiaoting Ma2

  • 1Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074 Hubei, People's Republic of China.

Journal of the American Chemical Society
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel filter-less ultraviolet (UV) polarimeter using chiral 2D perovskites. This device enables efficient full Stokes polarization detection for advanced optoelectronics.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Solid-State Physics

Background:

  • Full Stokes polarization detection is crucial for multidimensional optoelectronic systems.
  • Conventional polarimeters suffer from complexity and optical losses due to bulky designs.

Purpose of the Study:

  • To report a filter-less, full-Stokes ultraviolet (UV) polarimeter.
  • To utilize wide-bandgap chiral two-dimensional (2D) perovskites for enhanced polarization detection.

Main Methods:

  • Employed (R)/(S)-F-MBA2Pb1-xSnxCl4 (F-MBA = 4-fluoro-α-methylbenzylammonium) chiral 2D perovskites.
  • Investigated synergistic interactions between chiral organic cations and Sn-Pb alloyed frameworks.
  • Integrated periodic gratings into the device architecture.

Main Results:

  • Achieved efficient chirality transfer to inorganic sublattices, enabling spin-dependent charge transport.
  • Demonstrated a high photocurrent dissymmetry factor of 0.37 ± 0.027.
  • Attained high-fidelity full Stokes vector determination with low parameter errors (ΔS1=7.1%, ΔS2=6.9%, ΔS3=4.9%).

Conclusions:

  • This work presents the first filter-less UV full-Stokes polarimeter.
  • The developed molecular-engineering strategy is generalizable for integrated chiroptoelectronic applications.