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AEE-active cyclic tetraphenylsilole derivatives with ∼100% solid-state fluorescence quantum efficiency.

Yuanjing Cai1, Kerim Samedov, Brian S Dolinar

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Two novel tetraphenylsilole-based cyclosiloxanes exhibit strong aggregation-enhanced emission (AEE) and high solid-state fluorescence quantum yields. Crystal interactions, specifically C-Hπ bonds, are key to their efficient light emission.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic molecules with silole units are investigated for optoelectronic applications.
  • High solid-state fluorescence quantum yields are desirable for efficient light-emitting devices.
  • Aggregation-enhanced emission (AEE) is a phenomenon where molecular aggregation leads to increased fluorescence.

Purpose of the Study:

  • To synthesize and characterize new tetraphenylsilole-containing cyclosiloxanes.
  • To investigate the photophysical properties, specifically fluorescence, of these new compounds in the solid state.
  • To understand the role of crystal packing and interactions in achieving high fluorescence quantum yields.

Main Methods:

  • Organic synthesis of novel cyclosiloxane derivatives.
  • Spectroscopic analysis including UV-Vis absorption and fluorescence emission.
  • X-ray crystallography to determine solid-state molecular structures and intermolecular interactions.
  • Quantum yield measurements in the solid state.

Main Results:

  • Two new tetraphenylsilole-containing cyclosiloxanes were successfully synthesized.
  • The compounds display strong aggregation-enhanced emission (AEE) with cyan emissions (λem = 500 nm).
  • Near-unity solid-state fluorescence quantum yields (ΦF ≈ 100%) were achieved, with an AEE factor (I/I0) of approximately 94.
  • Intra- and intermolecular C-Hπ interactions within the crystal lattice were identified as crucial for the high fluorescence efficiency.

Conclusions:

  • The designed tetraphenylsilole-based cyclosiloxanes are highly efficient solid-state emitters.
  • C-Hπ interactions in the crystal structure significantly enhance solid-state fluorescence quantum yields.
  • These materials hold promise for applications in solid-state lighting and organic electronics.