Core-Shell Phosphor for High Brightness White LEDs

The patent applies composite materials by creating a core-shell structure where the core is formed from a crystal phase of an inorganic compound containing aluminum and the shell is formed from boron or silicon. This composite structure combines the advantages of different materials: the aluminum-containing crystal provides high light emission intensity while the boron or silicon shell improves color purity and light extraction efficiency, collectively achieving superior brightness performance that conventional single-material phosphors cannot attain

The patent applies local quality by creating a core-shell structure where different regions of the phosphor particle have different compositions and functions. The core region contains the aluminum-containing crystal phase responsible for high light emission intensity, while the shell region contains boron or silicon that provides color purity and light extraction. This spatial differentiation of material properties allows each region to optimize its specific function, resolving the contradiction between intensity and brightness performance

The patent uses composite materials with a core-shell structure where the shell made of boron or silicon acts as a protective layer that maintains color purity while the core aluminum-containing crystal provides high light emission intensity. This composite structure allows the phosphor to achieve both brightness and color purity simultaneously, as the shell prevents spectral broadening and the core maintains high quantum efficiency

The patent applies local quality by confining different functional properties to different spatial regions: the core region maintains the crystal structure for high intensity emission while the shell region controls color purity. This spatial separation allows independent optimization of brightness and color purity without compromise