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Related Concept Videos

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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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Multi-Layer π-Stacked Molecules as Efficient Thermally Activated Delayed Fluorescence Emitters.

Xue-Qi Wang1, Sheng-Yi Yang1, Qi-Sheng Tian1

  • 1Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.

Angewandte Chemie (International Ed. in English)
|November 23, 2020
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Summary

New donor/acceptor/donor (D/A/D) emitters achieve high-efficiency thermally activated delayed fluorescence (TADF). These 3D emitters demonstrate excellent photoluminescence quantum yields and external quantum efficiencies, surpassing traditional D/A designs.

Keywords:
charge transferdonor/acceptor interactionsspiro structuresthermally activated delayed fluorescenceπ-stacked molecules

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Area of Science:

  • Organic electronics
  • Materials science
  • Photophysics

Background:

  • Thermally activated delayed fluorescence (TADF) is crucial for high-efficiency organic light-emitting diodes (OLEDs).
  • Designing efficient TADF emitters requires precise control over molecular architecture and electronic properties.
  • Existing donor/acceptor (D/A) structures face limitations in charge transfer and excited state management.

Purpose of the Study:

  • To develop novel multi-layer π-stacked emitters with a donor/acceptor/donor (D/A/D) configuration.
  • To investigate the impact of spatial confinement and charge transfer (CT) on TADF properties.
  • To enhance photoluminescence quantum yields (PLQYs) and external quantum efficiencies (EQEs) in OLED devices.

Main Methods:

  • Synthesis of two 3D D/A/D emitters, DM-BD1 and DM-BD2, featuring dual donor and single acceptor moieties.
  • Fabrication of OLED devices utilizing the synthesized D/A/D emitters.
  • Characterization of photophysical properties including PLQY, singlet-triplet energy splitting (ΔEST), and reverse intersystem crossing (RISC) rates.

Main Results:

  • Achieved high PLQYs of 94.2% for DM-BD1 and 92.8% for DM-BD2 due to effective CT interactions in the enforced face-to-face D/A/D pattern.
  • Observed small ΔEST and rapid RISC processes, characteristic of efficient TADF.
  • Reached maximum EQEs of 28.0% for DM-BD1 and 26.6% for DM-BD2, outperforming D/A analogues.

Conclusions:

  • The D/A/D molecular design enables efficient spatial charge transfer and high TADF performance.
  • These 3D emitters represent a significant advancement over conventional D/A systems for OLED applications.
  • The developed emitters offer a promising pathway towards next-generation high-efficiency optoelectronic devices.