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

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

665
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...
665
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.4K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.4K
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

1.7K
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...
1.7K
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

1.2K
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...
1.2K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.6K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.6K
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

823
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
823

You might also read

Related Articles

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

Sort by
Same author

Hydrogen Atom Transfer Induces Photodegradation in Carbonyl-Based Multi-Resonance TADF Emitters.

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

Host-Guest Doping Enables Room Temperature Phosphorescence from Triarylboranes.

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

Heptazine-Assisted Multi-Resonance TADF Emitters With Fast Reverse Intersystem Crossing for Efficient Solution-Processed OLEDs.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Supramolecular host-guest modulated thermally activated delayed fluorescence for photodynamic therapy.

Chemical science·2025
Same author

Tuning the Excited State Character of Amine/Carbonyl Thermally Activated Delayed Fluorescence Emitters with Ring Fusion.

Chemistry (Weinheim an der Bergstrasse, Germany)·2025
Same author

Glassy organic dots exhibiting near-infrared TADF with quantum yields >40% for cellular imaging.

Journal of materials chemistry. B·2025

Related Experiment Video

Updated: Jan 8, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.9K

Investigating Vibronic Coupling Effects in Multiple-Resonance Thermally Activated Delayed Fluorescence Molecules.

Sydney Mikulin1, Katrina Bergmann1, Bruno T Luppi1

  • 1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

The Journal of Physical Chemistry. B
|December 11, 2025
PubMed
Summary

Heavy adamantyl substituents unexpectedly increased reverse intersystem crossing (rISC) rates in multiple resonance thermally activated delayed fluorescence (MR-TADF) materials. This suggests vibronic coupling

More Related Videos

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
14:12

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Published on: December 11, 2021

5.9K
Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

7.5K

Related Experiment Videos

Last Updated: Jan 8, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.9K
Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
14:12

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Published on: December 11, 2021

5.9K
Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

7.5K

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Multiple resonance thermally activated delayed fluorescence (MR-TADF) materials offer superior color purity over conventional TADF emitters.
  • A key limitation of MR-TADF materials is their typically slow reverse intersystem crossing (rISC) rates, hindering practical applications.

Purpose of the Study:

  • To investigate the influence of vibronic coupling on the rISC mechanism in MR-TADF emitters.
  • To explore the effect of introducing heavy adamantyl substituents to modulate vibrational modes and rISC rates.

Main Methods:

  • Synthesis of MR-TADF molecules functionalized with heavy adamantyl substituents.
  • Spectroscopic and photophysical characterization to analyze excited-state dynamics and rISC processes.
  • Computational modeling to understand the role of vibronic coupling and substituent effects.

Main Results:

  • Addition of adamantyl groups reduced vibronic coupling in a specific excited-state transition.
  • Surprisingly, adamantyl substituents facilitated rISC through an alternative pathway, increasing the overall rISC rate.
  • The vibrationally damped MR-TADF molecule exhibited a higher rISC rate than anticipated.

Conclusions:

  • Vibronic coupling plays a complex role in the rISC mechanism of MR-TADF emitters.
  • Heavy substituents can unexpectedly enhance rISC rates by opening alternative pathways.
  • Efficient rISC in MR-TADF may require less stringent vibrational damping than previously thought for donor-acceptor systems.