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Unlocking Color-Tunable Pyrene Emissions: Polymorph Engineering and Two-Photon Excited Charge-Transfer Cocrystals.

Pradip Pattanayak1, Bishes Ray1, Abhijit Chatterjee2

  • 1Department of Chemical Sciences and Center for Advanced Functional Materials, Indian Institute of Science Education and Research(IISER) , Kolkata, Mohanpur, West Bengal, India.

Small (Weinheim an Der Bergstrasse, Germany)
|December 31, 2025
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Summary
This summary is machine-generated.

Controlling crystal packing in pyrene derivatives significantly alters their light emission. This strategy enables highly efficient, color-tunable materials for advanced optoelectronic devices, including two-photon emitters.

Keywords:
charge‐transfer cocrystalscolor‐tunablepolymorph engineeringpyrene emissiontwo‐photon excitation

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Pyrene derivatives are known for their rich photophysical properties.
  • Controlling solid-state packing is crucial for tuning luminescence in organic materials.

Purpose of the Study:

  • To develop a polymorph-based design strategy for modulating excimer emission in pyrene derivatives.
  • To construct color-tunable charge transfer (CT) cocrystals with high emission efficiencies.

Main Methods:

  • Investigating the effect of crystal packing on photoluminescence quantum yield (PLQY) in functionalized pyrene molecules.
  • Synthesizing and characterizing CT cocrystals using pyrene donors and electron-accepting moieties.
  • Extending NIR emission by inducing radical formation in acceptor components.

Main Results:

  • A co-facial π-π stacked polymorph achieved 88% PLQY, while an orthogonally packed form showed 14% PLQY.
  • Synthesized cocrystals exhibited high emission efficiencies across the visible to NIR spectrum.
  • NIR emission was extended by inducing radical formation in acceptors.

Conclusions:

  • Crystal engineering of polycyclic aromatic hydrocarbons (PAHs) is a powerful approach to create highly emissive materials.
  • The presented strategy offers new prospects for advanced optoelectronic devices, such as efficient two-photon emitters.