Pixelated phosphors for high-resolution and high-contrast white light sources

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Laser-based lighting systems require efficient light conversion materials.
• Developing micro-scale phosphors is crucial for high-resolution displays and lighting.

Purpose of the Study:

• To investigate porous phosphor microstructures as light converters.
• To assess the performance and thermal properties of fabricated microstructures.

Main Methods:

• Fabrication of porous phosphor microstructures using silicon molds.
• Coating with aluminum oxide (Al2O3) via atomic layer deposition for stability.
• Characterization of pixel sizes from 2 mm down to 25 µm.

Main Results:

• Demonstrated significant luminance drop between adjacent pixels.
• Utilized silicon's high thermal conductivity for efficient cooling.
• Enabled active air cooling by removing backside silicon.

Conclusions:

• Porous phosphor microstructures are viable for high-resolution laser lighting.
• The fabrication method allows for precise control over pixel size and performance.
• Efficient thermal management is achievable for these microstructures.