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Related Concept Videos

UV–Vis Spectroscopy of Conjugated Systems01:32

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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.
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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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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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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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Related Experiment Video

Updated: Apr 10, 2026

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Bright visible light emission from graphene.

Young Duck Kim1, Hakseong Kim2, Yujin Cho3

  • 11] Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea [2] Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA.

Nature Nanotechnology
|June 16, 2015
PubMed
Summary
This summary is machine-generated.

Researchers achieved bright visible light emission from suspended graphene devices. This breakthrough enhances thermal radiation efficiency by 1,000-fold, enabling flexible, transparent displays and optical communications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Graphene and 2D materials offer potential for thin, flexible, transparent optoelectronics.
  • Graphene's strong light-matter interaction enables advanced photodetectors and modulators.
  • Electrically biased graphene on SiO2 substrates shows low-efficiency mid-infrared emission, but visible emission was previously unachieved.

Purpose of the Study:

  • To achieve bright visible light emission from graphene.
  • To investigate methods for enhancing thermal radiation efficiency in graphene.
  • To explore the potential for scalable graphene-based light emitters.

Main Methods:

  • Fabrication of electrically biased suspended graphene devices.
  • Analysis of heat transport and electron localization.
  • Utilizing optical interference for spectrum tuning.
  • Demonstration of scalable arrays using chemical-vapor-deposited graphene.

Main Results:

  • Observation of bright visible light emission from suspended graphene.
  • A 1,000-fold enhancement in thermal radiation efficiency due to localized hot electrons.
  • Tunable emission spectra via optical interference.
  • Scalable fabrication of graphene light emitter arrays.

Conclusions:

  • Suspended graphene devices enable efficient visible light emission.
  • This technology is scalable for large-area applications.
  • Potential for low-voltage, flexible, transparent displays and on-chip optical communication.