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Fast Delayed Emission in New Pyridazine-Based Compounds.

Simonas Krotkus1, Tomas Matulaitis2, Stefan Diesing1,2

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Summary

Researchers developed novel pyridazine-based molecules for efficient light emission. One molecule, dPXZMePydz, exhibits fast thermally activated delayed fluorescence (TADF) for improved organic light-emitting diodes (OLEDs).

Keywords:
donor-acceptor (D–A) architectureorganic light-emitting diode (OLED)pyridazinereverse intersystem crossing (rISC)thermally activated delayed fluorescence (TADF)

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Donor-acceptor molecules are crucial for optoelectronic applications.
  • Pyridazine (Pydz) is an underexplored acceptor moiety in such systems.
  • Thermally activated delayed fluorescence (TADF) enables efficient triplet harvesting for enhanced emission.

Purpose of the Study:

  • Synthesize and characterize novel donor-acceptor molecules featuring the pyridazine acceptor.
  • Investigate the structure-property relationships of these new compounds.
  • Evaluate their performance as emitters in organic light-emitting diodes (OLEDs).

Main Methods:

  • Synthesis of three novel pyridazine-containing donor-acceptor molecules.
  • Comprehensive structural, electrochemical, and photophysical characterization.
  • Fabrication and testing of OLED devices using the synthesized molecules as emitters.

Main Results:

  • Successful synthesis and characterization of novel Pydz-based molecules.
  • The dPXZMePydz molecule, with phenoxazine donors in a meta configuration, showed a high reverse intersystem crossing rate (kRISC = 3.9 × 106 s-1).
  • dPXZMePydz demonstrated fast TADF with a delayed emission lifetime <500 ns, enabling efficient triplet harvesting in OLEDs, unlike compounds with weaker donors.

Conclusions:

  • Novel pyridazine-based donor-acceptor molecules were successfully synthesized.
  • The dPXZMePydz molecule exhibits excellent TADF properties, leading to efficient light emission in OLEDs.
  • Pyridazine acceptors, when combined with strong donor units, are promising for developing high-performance TADF emitters.