Core-shell ZnO:Ga-SiO₂ nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect...

Area of Science:

• Materials Science
• Nanotechnology
• Luminescence

Background:

• Heat treatment enhances luminescence intensity in ZnO:Ga particles but increases agglomeration, reducing composite transparency.
• Agglomeration, low light yield, and low stopping power are key disadvantages of ZnO:Ga powder for optical applications.
• Limiting ZnO:Ga particle size is crucial for developing luminescent and transparent composites.

Purpose of the Study:

• To investigate the use of SiO2 coating to improve luminescence intensity and control crystallite size growth in ZnO:Ga particles.
• To prepare and evaluate ZnO:Ga and ZnO:Ga-SiO2 core-shell structures embedded in a polystyrene matrix.

Main Methods:

• SiO2 coating was applied to ZnO:Ga particles.
• ZnO:Ga and ZnO:Ga-SiO2 core-shell structures were synthesized.
• Composites were fabricated by embedding these particles in a polystyrene matrix.

Main Results:

• SiO2 coating successfully improved luminescence intensity.
• The coating effectively limited crystallite size growth during annealing.
• The embedded core-shell structures showed potential for optical applications.

Conclusions:

• SiO2 coating is an effective strategy to enhance luminescence and control particle size in ZnO:Ga materials.
• The developed ZnO:Ga-SiO2 core-shell structures offer improved properties for transparent luminescent composites.
• This approach addresses key limitations of ZnO:Ga powder for optical applications.