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Strain-engineered upconversion nanoparticles for power-tunable dynamic information encryption.

Changwen Li1, Yuqi Yang2, Jiaxiang Xiao1

  • 1Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China. dqian@hnu.edu.cn.

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Strain-engineered upconversion nanoparticles show tunable luminescence, enabling stepwise emission activation for sequential information display. This power-gated method offers a robust platform for dynamic and secure optical encryption.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Upconversion nanoparticles (UCNPs) are crucial for converting lower-energy light to higher-energy emissions.
  • Controlling UCNP luminescence properties is essential for advanced optical applications.

Purpose of the Study:

  • To demonstrate strain-engineered UCNPs with power-tunable luminescence.
  • To achieve sequential information display using controlled luminescence activation.
  • To develop a robust platform for secure optical encryption.

Main Methods:

  • Synthesizing strain-engineered UCNPs with controlled Ytterbium (Yb3+) doping.
  • Investigating luminescence properties under varied excitation powers.
  • Utilizing lattice-strain-induced phase transitions for emission control.

Main Results:

  • Achieved power-tunable luminescence in UCNPs through strain modulation.
  • Demonstrated stepwise emission activation by varying excitation power.
  • Successfully implemented sequential information display via controlled luminescence.

Conclusions:

  • Strain engineering offers precise control over UCNP luminescence.
  • Single-wavelength excitation with power gating enables dynamic optical encryption.
  • This approach provides a simple, robust, and secure method for optical data security.