Structural and optical characterization of Eu3+ doped beta-Ga2O3 nanoparticles using a liquid-phase precursor method

Area of Science:

• Materials Science
• Solid State Chemistry
• Nanotechnology

Background:

• Beta-gallium oxide (β-Ga2O3) is a promising wide-bandgap semiconductor material.
• Doping with rare-earth elements like Europium (Eu3+) can modify its optical and electronic properties.
• Understanding doping effects is crucial for developing advanced optoelectronic devices.

Purpose of the Study:

• To synthesize Eu3+ doped β-Ga2O3 nanoparticles using a liquid-phase precursor method.
• To investigate the structural and cathodoluminescence properties of the synthesized nanoparticles.
• To determine the effect of Eu3+ concentration on luminescence and identify luminescence quenching thresholds.

Main Methods:

• Synthesis of Eu3+ doped and non-doped β-Ga2O3 nanoparticles via liquid-phase precursor (LPP) method at 800°C.
• Characterization using X-ray diffraction (XRD) to analyze crystal structure.
• Cathodoluminescence (CL) spectroscopy to study emission spectra and luminescence properties.

Main Results:

• Synthesis yielded β-Ga2O3 nanoparticles with varying annealing times and Eu3+ concentrations.
• XRD analysis revealed a second phase in Eu3+ doped samples, indicated by broad peaks.
• CL spectra showed broad band emission (300-500 nm) attributed to imperfections and two component emissions.
• Luminescence quenching of Eu3+ dopant was observed gradually beyond a concentration of 5 mol%.

Conclusions:

• The LPP method is effective for synthesizing Eu3+ doped β-Ga2O3 nanoparticles.
• Eu3+ doping introduces structural modifications and influences the luminescence characteristics.
• A critical Eu3+ concentration threshold exists beyond which luminescence quenching occurs, impacting potential applications.