Phosphor-Converted LED Package for High-CRI White Light

The patent uses multiple phosphors with different emission characteristics (yellow-green phosphor and red phosphor) combined in a single wavelength converter. This composite phosphor system converts blue light into a broader spectrum containing both green and red components, thereby improving color rendition while maintaining the simplicity of using a blue LED chip as the light source.

The patent converts the harmful high-intensity blue light into beneficial green and red light through the wavelength converter containing multiple phosphors. The blue LED chip's strong blue emission, which causes harmful effects, is transformed into a balanced spectrum with reduced blue content and enhanced green and red components, turning a harmful characteristic into a beneficial one for color rendition and human health.

The patent introduces a wavelength converter as an intermediary component between the ultraviolet LED chip and the external environment. This wavelength converter absorbs the high-energy ultraviolet light and converts it into visible light with better color rendition. By placing this intermediary layer, the harmful ultraviolet radiation that causes encapsulant degradation and lead frame discoloration is converted into useful visible light, thereby extending device lifespan while maintaining color rendition quality.

The patent merges multiple phosphors with different emission characteristics into a single wavelength converter system. By combining yellow-green phosphor, red phosphor, and potentially other phosphors in specific proportions, the system achieves both high color rendition (CRI and R9) and maintained luminous intensity. The synergistic effect of multiple phosphors compensates for the luminous intensity loss that would occur with single-phosphor systems, while providing comprehensive spectral coverage for excellent color rendering.