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

588
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...
588
Stokes' Law01:20

Stokes' Law

1.1K
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
1.1K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.0K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.0K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
191
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

173
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
173
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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.
Selection Rules: Photochemical Activation
1.8K

You might also read

Related Articles

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

Sort by
Same author

High-efficiency and stable deep-blue iridium phosphorescent OLEDs with enhanced charge transfer dynamics.

Light, science & applications·2026
Same author

Amplified Spontaneous Emission Enhancement in FAPbI<sub>3</sub> Nanocrystal Films via PMMA and Mechanical Tunability on Flexible PET.

ACS applied materials & interfaces·2026
Same author

Unveiling the emission mechanism in analog-doped carbazole-based organic afterglow materials.

Nature communications·2026
Same author

Luminescent Donor-Acceptor Radical With Propeller Chirality: Bright and Photostable Red Circularly Polarized Luminescence and Whispering Gallery Mode Resonance.

Angewandte Chemie (International ed. in English)·2026
Same author

Infrared Ion Spectroscopy-Based Identification of a Trace Impurity in Organic Light-Emitting Diode Materials Without Fully Matched Reference Standards.

Analytical chemistry·2026
Same author

Discovery of tunable and soluble organic emitters for solid-state lasers with a self-driving laboratory.

Nature communications·2026

Related Experiment Video

Updated: Jun 6, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

11.2K

Anti-Stokes Emission Utilizing Reverse Intersystem Crossing.

Shintaro Kohata1, Hajime Nakanotani1,2, Takuya Hosokai3

  • 1Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.

Angewandte Chemie (International Ed. in English)
|November 22, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new photon-upconversion method using thermally activated delayed fluorescence (TADF) molecules. This novel approach enhances energy harvesting by efficiently generating high-energy excitons with minimal energy loss.

Keywords:
Anti-Stokes emissionDexter-type energy transferFörster-type energy transferPhoton-upconversionThermally activated delayed fluorescence

More Related Videos

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

3.9K
Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

19.5K

Related Experiment Videos

Last Updated: Jun 6, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

11.2K
Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

3.9K
Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

19.5K

Area of Science:

  • Organic electronics
  • Photophysics
  • Materials science

Background:

  • Photon-upconversion (PUC) is key for energy harvesting, but efficient, loss-free methods are lacking.
  • Existing PUC methods like triplet-triplet upconversion have limitations in yield and energy efficiency.

Purpose of the Study:

  • To propose and investigate a novel PUC mechanism utilizing reverse intersystem crossing in thermally activated delayed fluorescence (TADF) molecules.
  • To explore the potential of combining triplet sensitizers with TADF molecules for efficient energy transfer and anti-Stokes emission.

Main Methods:

  • Investigated a PUC process involving a triplet sensitizer (Ir(ppy)3) and a TADF molecule (CzBSe).
  • Analyzed triplet energy transfer dynamics and anti-Stokes emission characteristics.
  • Studied the influence of triplet radiative decay rate and Gibbs energy difference on energy transfer efficiency.

Main Results:

  • Demonstrated an alternative PUC mechanism via reverse intersystem crossing in TADF molecules.
  • Achieved anti-Stokes emission with an energy of 0.18 eV through triplet energy transfer from Ir(ppy)3 to CzBSe.
  • Identified that triplet energy transfer rates are significantly influenced by the TADF molecule's triplet radiative decay rate and the energy difference between donor and acceptor.

Conclusions:

  • The proposed PUC mechanism offers a promising route for efficient energy harvesting.
  • Findings advance the understanding of energy transfer dynamics in organic donor-acceptor systems.
  • Potential applications include advanced optical cooling systems and improved energy harvesting technologies.