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This summary is machine-generated.

Researchers developed V-shaped molecules for efficient, long-wavelength thermally activated delayed fluorescence (TADF) emission in both single and aggregate states, overcoming key challenges in molecular dye design.

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Cell imaging and antibacterial treatmentConformational flexibilityMulti‐state emissionThermally activated delayed fluorescence

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Achieving multi-state, visible-light-excited, long-wavelength thermally activated delayed fluorescence (TADF) with high efficiency in single molecular dyes is challenging.
  • Existing TADF materials often struggle with aggregation-caused quenching and limited emission states.

Purpose of the Study:

  • To design and synthesize novel V-shaped molecular emitters for efficient long-wavelength TADF.
  • To investigate the photophysical properties of these emitters in both single-molecule and aggregate states.
  • To explore their applications in cell imaging and antibacterial treatment.

Main Methods:

  • Synthesis of V-shaped emitters with electron-deficient benzothiadiazole and electron-rich triphenylamine or carbazole units.
  • Photophysical characterization including emission efficiency, quantum yield, and singlet-triplet energy gaps.
  • Evaluation of aggregation effects and application-based testing for cell imaging and antibacterial activity.

Main Results:

  • Developed V-shaped emitters exhibiting efficient long-wavelength TADF emission in both single-molecule (up to 75.90% efficiency) and aggregate states (up to 53.50% quantum yield).
  • V-shaped structure and intramolecular interactions prevent aggregation-caused quenching, ensuring bright luminescence.
  • Successfully applied as functional dyes for concentration-independent cell imaging and antibacterial treatment.

Conclusions:

  • The V-shaped molecular design enables efficient multi-state TADF emission with suppressed aggregation-caused quenching.
  • These novel emitters show great potential for advanced applications in bioimaging and therapeutics.
  • This work provides a pathway for designing next-generation long-wavelength TADF materials.