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AIE/ACQ Effects in Two DR/NIR Emitters: A Structural and DFT Comparative Analysis.

Ugo Caruso1, Barbara Panunzi2, Rosita Diana3

  • 1Department of Chemical Sciences, University of Napoli Federico II, 80126 Napoli, Italy. ugo.caruso@unina.it.

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|August 8, 2018
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Summary
This summary is machine-generated.

This study explores aggregation-induced emission (AIE) and aggregation caused quenching (ACQ) in phenylenevinylene (PV) materials. Dicyano-substituted PV solids exhibit bright deep-red/near-IR emission, highlighting substituent effects on photophysical properties.

Keywords:
AIE/ACQDFTDR/NIR emitterPLQY

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Aggregation-induced emission (AIE) and aggregation caused quenching (ACQ) are crucial photophysical phenomena in organic materials.
  • Understanding these effects is vital for designing efficient solid-state emitters.
  • Phenylenevinylene (PV) derivatives are widely studied for their optoelectronic applications.

Purpose of the Study:

  • To investigate and compare the AIE and ACQ effects in two solid-state materials: a basic phenylenevinylene (PV) and a dicyano-substituted PV.
  • To characterize the spectroscopic properties and crystallographic data of these materials.
  • To elucidate the influence of cyano-substituents on the AIE/ACQ mechanisms.

Main Methods:

  • Synthesis and characterization of two solid-state PV materials.
  • Spectroscopic analysis including fluorescence quantum yield measurements.
  • X-ray crystallography to obtain crystallographic data.
  • Time-dependent Density Functional Theory (TD-DFT) calculations.

Main Results:

  • One of the solid materials, a dicyano-PV derivative, demonstrated significant AIE, acting as a bright emitter in solid films.
  • The brightest emitter achieved a high fluorescence quantum yield of 75% in the deep red/near-infrared (DR/NIR) region.
  • Spectroscopic properties were correlated with crystallographic data and TD-DFT analysis.
  • Cyano-substituents were found to play a key role in activating the AIE/ACQ mechanisms.

Conclusions:

  • Dicyano-substitution in PV structures can effectively tune aggregation-dependent photophysical properties, favoring AIE.
  • High solid-state fluorescence quantum yields in the DR/NIR region are achievable with carefully designed PV materials.
  • The interplay between molecular structure, crystal packing, and electronic properties governs AIE/ACQ behavior.