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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–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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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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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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Broadband perovskite quantum dot spectrometer beyond human visual resolution.

Xiaoxiu Zhu1,2, Liheng Bian1,3, Hao Fu1,3

  • 11MIIT Key Laboratory for Low-dimensional Quantum Structure and Devices, Beijing Institute of Technology, 100081 Beijing, China.

Light, Science & Applications
|May 8, 2020
PubMed
Summary

Researchers developed novel perovskite quantum dot-embedded films for advanced quantum dot spectrometers. These films offer improved spectral resolution and range, surpassing human vision capabilities for wider applications.

Keywords:
Imaging and sensingQuantum dots

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Quantum dot spectrometers offer high resolution and compact size for hyperspectrometry.
  • Existing quantum dot spectrometers face limitations in spectral range, resolution, and repeatability due to material properties and fabrication challenges.
  • Challenges include limited spectral variety of quantum dots, algorithmic reconstruction robustness, photoluminescence emission, and poor batch-to-batch consistency.

Purpose of the Study:

  • To develop nonemissive perovskite-quantum-dot-embedded films (PQDFs) with precisely tunable transmittance spectra.
  • To enhance quantum dot spectrometer applications by overcoming limitations of existing technologies.
  • To improve spectral resolution, spectral range, and device repeatability.

Main Methods:

  • In situ fabrication of MA3Bi2X9 and Cs2SnX6 perovskite nanocrystals within a polymeric matrix.
  • Integration of 361 types of PQDFs into a filter array coupled with a silicon-based photodetector array.
  • Application of a compressive-sensing-based total-variation optimization algorithm for spectral reconstruction.

Main Results:

  • Achieved a spectral resolution of approximately 1.6 nm over a broad spectral range of 250-1000 nm.
  • Demonstrated high transmittance efficiency and good batch-to-batch repeatability of the fabricated PQDFs.
  • Developed a perovskite quantum dot spectrometer with performance exceeding human visual capabilities in spectral range and resolution.

Conclusions:

  • The developed PQDFs enable the construction of advanced quantum dot spectrometers with significantly improved performance.
  • This advancement paves the way for practical applications of quantum dot spectrometers.
  • The technology holds potential impact for artificial intelligence, clinical equipment, and scientific instrumentation.