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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Temporal Multilevel Luminescence Anticounterfeiting through Scattering Media.

Meiling Tan1,2,3, Feng Li1,2,3, Xing Wang4

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, People's Republic of China.

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Researchers developed novel shortwave infrared (SWIR)-emitting nanoparticles for advanced anticounterfeiting. These nanoparticles offer tunable luminescence lifetimes for secure, multilevel encryption through opaque materials.

Keywords:
anticounterfeitingcore/shellimaginglifetimemultiplexing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Optical anticounterfeiting is crucial for security but often limited to visible light and simple patterns.
  • Existing methods struggle with high-order encryption and penetration through scattering or opaque layers.
  • Shortwave infrared (SWIR) luminescence offers potential for advanced security features.

Purpose of the Study:

  • To develop novel SWIR-emitting nanoparticles for multilevel anticounterfeiting.
  • To achieve precisely controlled luminescence lifetimes for temporal encoding.
  • To demonstrate secure pattern visualization through opaque barriers.

Main Methods:

  • Fabrication of a core/shell/shell/shell lanthanide-doped nanoparticle structure (NaYF4:Yb3+/Er3+ @ NaYbF4 @ NaYF4 @ NaYF4:Nd3+).
  • Engineering an inert NaYF4 shell to regulate energy transfer and achieve long-lived SWIR emission at 1532 nm.
  • Precisely controlling the NaYF4 shell thickness to tune luminescence lifetime (∼3–10 ms) without reducing intensity.

Main Results:

  • Successfully synthesized core/multishell nanoparticles exhibiting tunable, long-lived SWIR luminescence.
  • Demonstrated the ability to encode optical patterns with precisely controlled lifetimes.
  • Visualized dynamic, secured images through opaque plastic and biomimetic intralipid layers using temporal optical multiplexing.

Conclusions:

  • The developed SWIR nanoparticles enable multilevel anticounterfeiting with enhanced security.
  • Tunable luminescence lifetime provides a novel mechanism for temporary, time-domain optical codes.
  • This technology has potential applications in optical data storage, biosensing, diagnostics, and nanomedicine.