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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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...

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Related Experiment Video

Updated: Jun 10, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Creating Concentration-Insensitive TADF Luminogens With Spiro-Fused Xanthone Acceptors for Highly Efficient OLEDs.

Jiajie Zeng1, Yuanyuan Wu1, Ziwei Chen1

  • 1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, China.

Angewandte Chemie (International Ed. in English)
|February 22, 2026
PubMed
Summary
This summary is machine-generated.

New thermally activated delayed fluorescence (TADF) materials enable high-efficiency organic light-emitting diodes (OLEDs) without concentration quenching. These novel luminogens offer stable performance across various concentrations, advancing OLED technology.

Keywords:
electroluminescencehyperfluorescencemulti‐resonanceorganic light‐emitting diodesthermally activated delayed fluorescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Thermally activated delayed fluorescence (TADF) materials are crucial for next-generation organic light-emitting diodes (OLEDs).
  • Current TADF materials often suffer from emission quenching and exciton annihilation at higher concentrations, limiting their industrial application.
  • Developing concentration-insensitive TADF emitters is essential for improving OLED performance and manufacturing processes.

Purpose of the Study:

  • To design and synthesize novel TADF luminogens with improved properties for OLED applications.
  • To investigate the photophysical properties and device performance of these new TADF materials.
  • To demonstrate a molecular design strategy for high-performance, concentration-insensitive TADF emitters.

Main Methods:

  • Synthesis of four tailored TADF luminogens featuring spiro-fused xanthone acceptors and acridine-based spiro donors.
  • Characterization of photophysical properties, including quantum yields and emission spectra.
  • Fabrication and testing of non-doped and doped OLED devices to evaluate external quantum efficiency (EQE) and roll-off performance.

Main Results:

  • The developed TADF luminogens exhibit high quantum yields (up to 99%) and emit cyan to green light.
  • Non-doped OLEDs achieved an excellent EQE of 30.6% with minimal roll-off.
  • The materials demonstrated concentration insensitivity in doped OLEDs, maintaining high EQEs (29.1%–36.8%) across a wide concentration range (10–90 wt%).
  • The TADF materials also functioned effectively as sensitizers for multi-resonance emitters, yielding impressive EQEs of 41.0%.

Conclusions:

  • A new molecular design strategy using rigid, bulky spiro-fused structures leads to robust TADF materials.
  • These materials overcome concentration quenching issues, enabling high-performance, stable OLEDs.
  • The developed TADF luminogens are suitable for both emitter and sensitizer applications in advanced OLEDs.