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Nonaromatic polymer-deep eutectic solvent complexes with ultralong room-temperature and high-temperature

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|March 26, 2026
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Researchers developed a new method to create ultralong organic phosphorescence (UOP) materials using deep eutectic solvents (DES) and hydrogels. These novel materials exhibit high-temperature phosphorescence (HTP) and stable UOP for diverse applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Achieving ultralong organic phosphorescence (UOP) and high-temperature phosphorescence (HTP) in non-aromatic luminogens is challenging.
  • Nontraditional luminogens (NTLs) often lack the necessary properties for sustained phosphorescence.

Purpose of the Study:

  • To develop a universal strategy for preparing UOP and HTP materials from NTLs.
  • To investigate the role of deep eutectic solvents (DES) in enhancing phosphorescence properties.

Main Methods:

  • Solvent exchange of NTLs-based hydrogel with DES, followed by wet annealing.
  • Characterization of phosphorescence properties including afterglow, RTP lifetime, quantum yield, and HTP.

Main Results:

  • Polyacrylamide-DES complexes achieved afterglows up to 9.5 s and room-temperature phosphorescence (RTP) lifetimes up to 622.5 ms.
  • High phosphorescence quantum yields of 17.6% and HTP with a lifetime of 366.2 ms at 120°C were observed.
  • Stable UOP in organic solvents and strong hydrogen bonding interactions were confirmed.

Conclusions:

  • The developed strategy provides a universal method for creating non-aromatic UOP materials.
  • DES plays a crucial role through hydrogen bonding and heavy atom effects, enabling enhanced phosphorescence.
  • The rigidified structures of the complexes are key to achieving stable HTP.