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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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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...
7.2K
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

25.0K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
25.0K
IR Spectrometers01:25

IR Spectrometers

1.2K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Updated: Aug 14, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Perovskite single-detector visible-light spectrometer.

Jia Wang, Xiaojian Hao, Baowu Pan

    Optics Letters
    |January 13, 2023
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    Summary
    This summary is machine-generated.

    We developed a compact perovskite spectrometer using deep learning for visible light analysis. This novel device achieves 1 nm resolution, paving the way for on-chip spectroscopy applications.

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    Area of Science:

    • Optoelectronics
    • Spectroscopy
    • Artificial Intelligence

    Background:

    • Traditional spectrometers are often bulky and expensive.
    • Miniaturization of spectroscopic devices is crucial for portable and on-chip applications.

    Purpose of the Study:

    • To demonstrate a perovskite single-phototransistor visible-light spectrometer.
    • To leverage deep learning for spectral reconstruction.
    • To achieve high-resolution spectroscopy in a compact form factor.

    Main Methods:

    • Fabrication of a perovskite single-phototransistor.
    • Development of a deep-learning system trained on photoresponsivity matrix.
    • Reconstruction of unknown spectra from photocurrent vectors.

    Main Results:

    • Successful reconstruction of a 532-nm laser and multipeak broadband spectrum.
    • Achieved 1 nm spectral resolution by increasing sampling points.
    • Demonstrated potential for further resolution enhancement.

    Conclusions:

    • Perovskite single-phototransistor spectrometers with deep learning offer a viable path for miniaturized spectroscopy.
    • Artificial intelligence integration enables on-chip visible-light spectroscopy.
    • The developed method shows promise for advanced optical sensing technologies.