Multi-Phosphor Light-Emitting Element for Sunlight-Like Spectra

The patent divides the wavelength conversion function into multiple segments by using different phosphors for different wavelength ranges. Specifically, it uses a first phosphor for converting blue light to green, a second phosphor for converting blue light to red, and a third phosphor for converting green light to red. This segmentation allows each phosphor to operate at optimal conversion efficiency for its specific wavelength range, reducing overall energy loss while achieving a complete spectral distribution similar to sunlight.

The patent applies local quality by creating spatially separated phosphor layers rather than uniformly dispersing all phosphors throughout the molding material. Each phosphor layer is positioned in a specific region where it can be effectively excited by the appropriate wavelength of light. This localized arrangement allows the use of high-purity, low-moisture-resistant molding material in critical areas while still achieving the desired spectral distribution through the combined emission of all phosphor layers.

The patent implements a dynamic wavelength conversion system where multiple conversion pathways are activated simultaneously. Instead of a single static conversion process, the system dynamically utilizes blue light from the LED to excite multiple phosphors (green-converting, red-converting, and directly emitting blue), and also uses the emitted green light to excite the red-converting phosphor. This multi-path dynamic conversion maximizes energy utilization by reducing Stoke's shift losses through optimized excitation-emission matching while maintaining simple device architecture.