Light Output Efficiency of Surface-Mount Lamp Beads Based on New Solid-Liquid UV Encapsulation

To address the problem of low efficiency of AIGaN-based UV LED chips, this study developed a type of solid-liquid packaged UV LED chip and analyzed its light output efficiency under different parameters. The light output efficiency of UV LED chips with and without solid-liquid encapsulation were analyzed using different reflective materials inside the chips. It was found that Au, Ag, and total-absorption reflective materials could not improve the light-output efficiency of UV LED liquid packaging. In addition, Al reflective materials and total reflection photonic crystals can improve the light output efficiency of UV LED liquid packaging, with the highest efficiency increase reaching over 74%. The light output efficiencies of liquid packaging with quartz cover sheets of different thicknesses were analyzed; the results revealed that the thinner the quartz cover sheet, the higher the efficiency; Under the same conditions, the efficiency improvement of UV LED surface-mount beads is not significant with different thicknesses of quartz cover sheets; Under the same thickness of quartz cover, Al reflective material and total reflection photonic crystal can improve the light output efficiency of UV LED liquid packaging.