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Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns

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Summary

Researchers developed amorphous coordination polymer nanoparticles (CPNs) for air-stable photon upconversion (UC). These nanoparticles offer high dye density and tunable ratios, enabling applications in anticounterfeiting and luminescent solar concentrators.

Keywords:
coordination polymer nanoparticlesluminescent solar concentratorsmetal−organic frameworktriplet−triplet annihilationupconversion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Photon upconversion (UC) via triplet-triplet annihilation shows promise but faces challenges in creating stable solid-state materials.
  • Achieving diffusion-limited, air-stable UC in solid materials remains a significant hurdle.

Purpose of the Study:

  • To engineer amorphous coordination polymer nanoparticles (CPNs) for air-stable photon upconversion.
  • To demonstrate the versatility of these CPNs in various applications.

Main Methods:

  • Designed UC coordination polymer nanoparticles (CPNs) with sensitizer and emitter molecules featuring alkyl spacers to promote amorphous character.
  • Synthesized two types of UC-CPNs with tunable dye ratios and characterized their UC properties.
  • Evaluated CPNs for anticounterfeiting applications and luminescent solar concentrators.

Main Results:

  • Developed amorphous CPNs that overcome limitations of crystalline metal-organic frameworks (MOFs), enabling high dye density and tunability.
  • Achieved highly photostable UC in two distinct visible spectral regions.
  • Demonstrated successful printing of CPNs for anticounterfeiting and creation of transparent, photostable films for luminescent solar concentrators, all exhibiting air-stable UC.

Conclusions:

  • Amorphous CPNs offer a viable strategy for achieving air-stable photon upconversion.
  • The developed CPNs are suitable for advanced applications requiring stable luminescence, such as anticounterfeiting and energy harvesting.