Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

635
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
635
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

2.0K
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.
A pair of electrons in a...
2.0K
Photoluminescence: Applications01:14

Photoluminescence: Applications

386
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...
386
P-N junction01:11

P-N junction

508
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
508
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

496
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
496

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

<i>GW</i>+2SOSEX Self-Energy Made Positive Semidefinite.

Journal of chemical theory and computation·2025
Same author

Electron Traversal Times in Disordered Graphene Nanoribbons.

Entropy (Basel, Switzerland)·2020
Same author

Ultrafast coupled charge and spin dynamics in strongly correlated NiO.

Nature communications·2020
Same author

Time-resolved impurity-invisibility in graphene nanoribbons.

Nanoscale·2019
Same author

Erratum: Padé resummation of many-body perturbation theories.

Scientific reports·2017
Same author

Padé resummation of many-body perturbation theories.

Scientific reports·2017

Related Experiment Video

Updated: Jun 21, 2025

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
07:44

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Published on: November 16, 2018

8.9K

Electroluminescence Rectification and High Harmonic Generation in Molecular Junctions.

Riku Tuovinen1, Yaroslav Pavlyukh2

  • 1Department of Physics, Nanoscience Center, University of Jyväskylä, P.O. Box 35, Jyväskylä 40014, Finland.

Nano Letters
|July 10, 2024
PubMed
Summary

Researchers modeled molecular junctions using a new quantum pump theory. They observed electroluminescence and high harmonic generation, bridging the gap between experimental and theoretical timescales in molecular electronics.

Keywords:
First-principles calculationsMolecular junctionNanoscale electronicsNonequilibrium transportQuantum cavityUltrafast spectroscopy

More Related Videos

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
10:41

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

8.8K
Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
06:08

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

8.9K

Related Experiment Videos

Last Updated: Jun 21, 2025

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
07:44

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Published on: November 16, 2018

8.9K
Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
10:41

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

8.8K
Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
06:08

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

8.9K

Area of Science:

  • Molecular electronics
  • Quantum phenomena
  • Condensed matter physics

Background:

  • Discrepancy between experimental (static to GHz) and theoretical (femtoseconds) timescales in molecular electronics.
  • Need for theoretical models that operate on experimentally relevant timescales.
  • Existing models struggle to capture complex quantum effects in molecular junctions.

Purpose of the Study:

  • To model molecular junctions on experimentally accessible timescales using a novel theoretical formalism.
  • To investigate the quantum pump effect in a benzenedithiol molecule coupled to cavity photons.
  • To analyze electric and photonic current responses under ac bias voltage.

Main Methods:

  • Utilized a recently developed time-linear nonequilibrium Green function formalism.
  • Modeled a molecular junction consisting of a benzenedithiol molecule and two copper electrodes.
  • Coupled the molecular junction with cavity photons to study quantum effects.
  • Calculated electric and photonic current responses to an applied ac bias voltage.

Main Results:

  • Observed pronounced electroluminescence in the molecular junction setup.
  • Detected high harmonic generation, a phenomenon typically seen in solids.
  • Demonstrated that the mechanism of high harmonic generation is more akin to solid-state behavior than isolated molecular responses.
  • Found that the suppression or enhancement of even harmonics depends on the driving field's symmetry.

Conclusions:

  • The developed theoretical formalism successfully models molecular junctions on experimentally relevant timescales.
  • The study reveals quantum pump effects, including electroluminescence and high harmonic generation, in molecular systems.
  • The findings suggest that molecular junctions can exhibit solid-state-like quantum phenomena, expanding the scope of molecular electronics.
  • The work bridges a critical gap between theoretical predictions and experimental observations in molecular electronics.