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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Related Experiment Video

Updated: Jan 13, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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Heptazine-Assisted Multi-Resonance TADF Emitters With Fast Reverse Intersystem Crossing for Efficient

Changfeng Si1, Katrina Bergmann1, Kunping Guo2,3

  • 1Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada.

Advanced Materials (Deerfield Beach, Fla.)
|January 10, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed novel heptazine-assisted multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters for solution-processed organic light-emitting diodes (SP-OLEDs). These emitters achieve high efficiency and brightness with minimal roll-off, setting new benchmarks for advanced display technologies.

Keywords:
fast reverse intersystem crossingheptazinemulti‐resonancesolution‐processed OLEDsthermally activated delayed fluorescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Solution-processed organic light-emitting diodes (SP-OLEDs) face challenges in achieving narrowband emission, high brightness, and minimal efficiency roll-off.
  • Developing efficient and stable emitters is crucial for advancing OLED technology.

Purpose of the Study:

  • To design and synthesize novel heptazine-assisted multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters for high-performance SP-OLEDs.
  • To investigate the photophysical properties and device performance of these new emitters.

Main Methods:

  • Synthesis of three MR-TADF emitters (HAP-CzBN, HAP-2CzBN, HAP-3CzBN) by integrating a heptazine core with multi-resonance units.
  • Characterization of photoluminescence quantum yields, singlet-triplet energy gaps (ΔEST), and emission spectra.
  • Fabrication and testing of SP-OLED devices using the synthesized emitters.

Main Results:

  • Emitters exhibited excellent photoluminescence quantum yields and tunable emission wavelengths (green to yellow) with narrow full widths at half maximum (FWHM).
  • HAP-3CzBN demonstrated a record-high reverse intersystem crossing (RISC) rate constant and short delayed lifetime for long-wavelength MR-TADF emitters.
  • SP-OLEDs achieved peak external quantum efficiencies (EQE) up to 20.3% with exceptional current efficiencies and negligible roll-off at high brightness.

Conclusions:

  • The developed heptazine-assisted MR-TADF emitters are highly effective for high-performance SP-OLEDs.
  • These emitters offer a promising pathway for achieving bright, efficient, and stable displays via solution processing.
  • The study sets new benchmarks for MR-TADF devices, particularly for long-wavelength emission and high brightness applications.