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Highly Efficient Cuprous Complexes with Thermally Activated Delayed Fluorescence for Solution-Processed Organic

Dong Liang1,2, Xu-Lin Chen1, Jian-Zhen Liao1,2

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Summary

New cuprous complexes featuring a novel diimine ligand exhibit intense luminescence and high efficiency in solution-processed OLEDs. These materials demonstrate potential for advanced display technologies.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Development of novel luminescent materials is crucial for advancing organic light-emitting diodes (OLEDs).
  • Cuprous complexes offer potential for efficient light emission due to their electronic properties.

Purpose of the Study:

  • To design and synthesize novel mononuclear cuprous complexes with enhanced luminescent properties.
  • To investigate the photophysical and electrochemical characteristics of these complexes.
  • To fabricate and evaluate solution-processed OLEDs utilizing these complexes.

Main Methods:

  • Synthesis and characterization of two mononuclear cuprous complexes: [Cu(PNNA)(POP)]BF4 (1) and [Cu(PNNA)(Xantphos)]BF4 (2).
  • Structural, electrochemical, and photophysical property analysis using single-crystal X-ray analysis, cyclic voltammetry, and temperature-dependent spectroscopy.
  • Density functional theory (DFT) calculations to support experimental observations.

Main Results:

  • Complexes 1 and 2 exhibit intense bluish-green luminescence with high photoluminescence quantum yields (up to 74.6%) in doped films.
  • Thermally activated delayed fluorescence (TADF) was observed, attributed to intraligand charge transfer facilitated by the 9,9-dimethylacridan moiety.
  • Solution-processed OLEDs fabricated with these complexes achieved high performance, with one device showing a 7.42% external quantum efficiency.

Conclusions:

  • The designed cuprous complexes demonstrate significant potential as efficient emitters for solution-processed OLEDs.
  • The incorporation of a strong electron-donor moiety effectively enables TADF, enhancing luminescent properties.
  • These findings contribute to the development of next-generation display and lighting technologies.