Red-Phosphor-Dot-Doped Array in Mirror-Surface Substrate Light-Emitting Diodes

Micro-patterned red-phosphor-dot-doped array in mirror-surface substrate light-emitting diodes (LEDs), which are primarily characterized with imbedded red phosphor dots in yellow phosphor slurry and an installed mirror on the substrate surface, are investigated. These dots scatter lights in different colors, compensate the long waveband in LED spectra, and allow exiting blue rays to escape in large angles. This mirror surface reflects downward blue lights emitted by chips, blends various-wavelengthed light beams, and enhances the cooling effect on the entire module. With the aid of these two modifications, the quantum efficiency (QE) and the luminous efficacy of radiation (LER) have been typically elevated by 16.6% and 38.8%, respectively. Proposed modules can be used in the LED industry for guiding improvements of QE, LER, and yellow–blue ratio uniformity.