Encapsulation of ZrO2 Nanoparticles for Improving Total Luminous Flux of White Light-Emitting Diodes

In recent years, white light-emitting diodes (LEDs) have gained traction in general lighting and displays owing to their energy efficiency and high performance. Zirconium dioxide (ZrO ${}_{{2}}$ ) nanoparticles, characterized by high refractive indices, can significantly improve the luminous efficiency of white LEDs. When integrated into the encapsulation resin of white LED packaging (PKG), a small quantity of these nanoparticles effectively scatters the light emitted by the LED chip, thereby enhancing light extraction from the PKG. A ray-tracing simulation was employed to study the optical behavior of ZrO ${}_{{2}}$ nanoparticles within white LED PKG. Subsequently, the distribution of the ZrO ${}_{{2}}$ nanoparticles was optimized, and the mechanism underlying the enhanced luminosity was analyzed. The simulation results reveal that ZrO ${}_{{2}}$ nanoparticles, particularly in the 50–100-nm range, significantly enhance luminosity while reducing phosphor usage in white LED manufacturing.