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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Achieving efficient organic afterglow is challenging due to spin-forbidden intersystem crossing and phosphorescence decay.
  • Macromolecular self-assembly offers a strategy for designing advanced functional materials.

Purpose of the Study:

  • To fabricate high-performance room-temperature organic afterglow materials.
  • To control excited state properties of difluoroboron β-diketonate (BF2bdk) compounds using synthetic polymers.

Main Methods:

  • Utilized a two-component design strategy combining synthetic polymers with BF2bdk and deuterated BF2bdk compounds.
  • Investigated polymer-BF2bdk interactions, including dipole-dipole interactions, to tune excited state energy levels (S1, T1) and energy gaps (ΔEST).
  • Assessed the impact of polymers on intramolecular motion and oxygen quenching of BF2bdk triplets.

Main Results:

  • Polymer component effectively lowered BF2bdk S1 levels while minimally affecting T1 levels, reducing ΔEST and enhancing intersystem crossing.
  • Polymers suppressed intramolecular motion and protected BF2bdk triplets from oxygen quenching.
  • Resulting BF2bdk-polymer materials showed emission lifetimes up to 2.2 s, high photoluminescence quantum yields, and excellent processability.

Conclusions:

  • Synthetic polymers can effectively control excited state properties for high-performance organic afterglow materials.
  • The developed materials exhibit excellent ambient performance, flexibility, and processability.
  • These materials serve as efficient donors for energy transfer, enabling the construction of red afterglow systems.