Near-Infrared Emitting Nd³⁺:LaF₃ Nano-Glass-Ceramics Produced by Sol-Gel Technology

Area of Science:

• Materials Science
• Solid State Chemistry
• Photonics

Background:

• Sol-gel synthesis offers versatile routes for creating advanced materials.
• Neodymium (Nd³⁺) doped materials are crucial for various optical and laser applications.
• Controlling nanocrystal formation in glass-ceramics impacts luminescent properties.

Purpose of the Study:

• To synthesize sol-gel derived nano-glass-ceramics doped with Nd³⁺ ions.
• To investigate the effect of heat treatment temperature on structural and luminescent properties.
• To evaluate the potential of these materials for near-infrared (NIR) luminescence applications.

Main Methods:

• Sol-gel synthesis of Nd³⁺ doped materials.
• Controlled heat treatment at 700°C and 900°C.
• Structural characterization using X-ray Diffraction (XRD).
• Optical characterization including Photoluminescence (PL) and Excitation (PLE) spectra.
• Analysis of luminescence decay curves.

Main Results:

• Crystallization of LaF₃:Nd³⁺ nanophase was confirmed by XRD.
• All samples exhibited characteristic Nd³⁺ emission bands in the NIR region.
• Materials annealed at 900°C showed significantly more intense NIR luminescence and longer lifetimes for the ⁴F_3/2 excited state compared to those annealed at 700°C.
• Luminescence lifetimes ranged from 141–772 μs (700°C) and 213–862 μs (900°C).

Conclusions:

• The heat treatment temperature critically influences the structural and luminescent properties of the sol-gel derived nano-glass-ceramics.
• Nd³⁺ ions were partially incorporated into the LaF₃ nanocrystals.
• These nano-glass-ceramics are promising candidates for NIR luminescence applications due to their enhanced optical properties at higher annealing temperatures.