Tunable Luminescent Properties and Multifunctional Imaging Applications of (Gd_1-R)₂O₂S:Tb³⁺ (R = Y, La) Phosphor and...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Gadolinium oxysulfide (Gd2O2S:Tb3+) phosphors are crucial for various imaging technologies.
• Enhancing luminescent properties and thermal stability is key for advanced applications.

Purpose of the Study:

• To synthesize and characterize novel (Gd1-R)2O2S:yTb3+ (R = Y, La) phosphors.
• To investigate the effects of Y3+ and La3+ co-doping on luminescence and thermal stability.
• To evaluate the potential of optimized phosphors in imaging applications.

Main Methods:

• Carbothermal reduction method for phosphor synthesis.
• Luminescent spectra analysis under UV and cathode ray excitation.
• Thermal stability testing at elevated temperatures.
• Fabrication and imaging evaluation of phosphor screens.

Main Results:

• Optimal Tb3+ concentrations determined for UV and cathode ray excitation.
• Y3+ co-doping significantly enhanced luminescence intensity, with (Gd0.75Y0.25)2O2S:0.06Tb3+ showing the highest intensity.
• La3+ co-doping had an opposite effect on luminescence.
• Improved thermal stability observed, with phosphors retaining significant emission intensity at 423 K.
• (Gd0.75Y0.25)2O2S:0.06Tb3+ phosphor screens demonstrated effective imaging capabilities.

Conclusions:

• Co-doping with Y3+ is an effective strategy to enhance the performance of Gd2O2S:Tb3+ phosphors.
• The developed (Gd1-R)2O2S:Tb3+ phosphors exhibit excellent luminescent and thermal properties.
• These phosphors hold significant promise for applications in low-light imaging, non-destructive testing, and medical imaging.