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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials offer 100% exciton utilization and narrowband emission.
  • Development of ultraviolet (UV) MR-TADF emitters is hindered by scarcity and low reverse intersystem crossing (RISC) efficiency.

Purpose of the Study:

  • To theoretically design high-performance UV MR-TADF materials.
  • To investigate strategies for enhancing RISC efficiency in UV emitters.

Main Methods:

  • Theoretical investigation of phosphine oxide/sulfide polycyclic aromatic compounds.
  • Utilizing acceptor modifications and peripheral fusion strategies.
  • Analyzing molecular properties like reorganization energies and charge transfer characteristics.

Main Results:

  • Designed UV emitters exhibit small reorganization energies and short-range charge transfer for narrowband emission.
  • Molecules with P═S units or sulfur peripheral locking show ultrahigh total RISC rates (~10^5 s^-1).
  • High-lying triplet-mediated RISC channels and reduced ΔE(T1-T2) facilitate exciton accumulation.

Conclusions:

  • Novel design principles for high-performance UV MR-TADF materials were established.
  • Structure-property relationships provide insights for future optoelectronic material development.
  • Achieved high RISC efficiency and narrowband emission in designed UV emitters.