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

870
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...
870
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

3.0K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
3.0K
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

1.3K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.3K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.7K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.7K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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...
1.3K

You might also read

Related Articles

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

Sort by
Same author

Supramolecular H-Aggregates of Squaraines with Enhanced Type I Photosensitization for Combined Photodynamic and Photothermal Therapy.

ACS nano·2024
Same author

Engineering PTS-based glucose metabolism for efficient biosynthesis of bacterial cellulose by Komagataeibacter xylinus.

Carbohydrate polymers·2024
Same author

Engineering Shewanella oneidensis-Carbon Felt Biohybrid Electrode Decorated with Bacterial Cellulose Aerogel-Electropolymerized Anthraquinone to Boost Energy and Chemicals Production.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2024
Same author

Phenotyping of FGF12A<sup>V52H</sup> mutation in mouse implies a complex FGF12 network.

Neurobiology of disease·2024
Same author

Research on the mechanism of threefold discrepancy in thermal conductivity between room temperature and phase transition temperature for 1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) crystals.

Physical chemistry chemical physics : PCCP·2024
Same author

Chemosynthetic alphaproteobacterial diazotrophs reside in deep-sea cold-seep bottom waters.

mSystems·2024

Related Experiment Video

Updated: Apr 29, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

12.1K

Synergistic Modulation of Triplet Density and Heavy-Atom Effect Accelerates Reverse Intersystem Crossing for

Ming Yang1,2, Jiahui Liu1, Cheng Zhong3

  • 1Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, P. R. China.

Angewandte Chemie (International Ed. in English)
|April 28, 2026
PubMed
Summary

Researchers developed a novel organic emitter for OLEDs that achieves pure green light and fast spin conversion. This breakthrough overcomes a key challenge in developing efficient and color-pure organic light-emitting diodes.

Keywords:
heavy‐atom effectminimal efficiency roll‐offnarrowband green OLEDstriplet density

More Related Videos

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

6.5K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.0K

Related Experiment Videos

Last Updated: Apr 29, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

12.1K
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

6.5K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.0K

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Developing purely organic emitters for OLEDs faces challenges in balancing rapid triplet-to-singlet spin conversion with high color purity.
  • Achieving efficient and stable OLED performance requires overcoming the trade-off between fast reverse intersystem crossing (RISC) and narrow emission bandwidth.

Purpose of the Study:

  • To design a novel multi-resonance thermally activated delayed fluorescence (MR-TADF) emitter that combines rapid RISC with BT.2020-relevant color purity.
  • To investigate a synergistic strategy involving increased triplet density and a heavy-atom effect for enhanced OLED performance.

Main Methods:

  • Synthesized a novel MR-TADF emitter by fusing a sulfur-containing fragment into the molecular skeleton.
  • Utilized theoretical studies and control experiments to analyze the electronic structure and spin-orbit coupling.
  • Fabricated and characterized non-sensitized OLED devices with the developed emitter.

Main Results:

  • The new emitter achieved pure green emission at 514 nm with a narrow full width at half maximum (FWHM) of 17 nm.
  • An ultrafast RISC rate constant of 5.1 × 10^6 s^-1 was achieved, indicating efficient spin conversion.
  • OLED devices demonstrated a maximum external quantum efficiency (EQE) of 34.6% with minimal efficiency roll-off and excellent CIE coordinates (0.20, 0.74).

Conclusions:

  • The synergistic strategy effectively enhances RISC rates and preserves narrowband emission, overcoming the typical trade-off in MR-TADF systems.
  • The developed emitter represents a significant advancement in purely organic OLED technology, offering high efficiency and color purity.
  • This work provides a general design principle for future development of high-performance MR-TADF materials.