Rare earth ions doped fluoride Core-Shell structured nanoparticles for dual-wavelength responsive emission color...

Area of Science:

• Materials Science
• Optics
• Chemistry

Background:

• Increasing information security challenges necessitate novel encryption methods.
• Optical information encryption using rare earth ions offers promising solutions.
• Up-conversion luminescence provides a basis for advanced optical security.

Purpose of the Study:

• To investigate core-shell structured rare earth phosphors for optical information encryption.
• To control up-conversion luminescence by modulating excitation conditions and temperature.
• To demonstrate the potential for wavelength-responsive pure color emission in secure data storage.

Main Methods:

• Fabrication of core-shell structured Er@Y@Tm and Er@Y@Ho phosphors.
• Controlled excitation using 980 nm and 1550 nm lasers.
• Analysis of luminescence properties under varying excitation conditions and temperatures.
• Demonstration of optical coding and encoding for information storage.

Main Results:

• Er@Y@Tm phosphors exhibited wavelength-responsive pure red and blue emission.
• Er@Y@Ho phosphors showed wavelength-responsive green and red emission.
• Emission color tuning was achieved through excitation conditions and temperature.
• Successful demonstration of optical coding and encoding for information storage.

Conclusions:

• Dual-wavelength responsive pure color up-conversion luminescence is feasible.
• This technology can be applied to dynamic information encryption.
• The developed phosphors advance data protection and information security technologies.