Alpha-sialon Phosphor Slit Surface Fluorescence

The invention applies local quality by creating slits at specific locations on the phosphor particle surface. The slits are formed at predetermined positions to control light incidence and emission angles locally, rather than uniformly treating the entire surface. This localized modification optimizes fluorescence characteristics by enhancing light extraction at critical interfaces while maintaining the bulk properties of the phosphor particle.

The invention transitions from controlling only particle size (one dimension) to controlling both particle size and surface topology (adding another dimension). By introducing slits that create three-dimensional surface features, the invention adds a new degree of freedom for optimizing fluorescence characteristics, allowing independent control of light interaction with the phosphor surface beyond what particle diameter classification alone can achieve.

The invention applies preliminary action by forming slits on the phosphor particle surface before the particles are incorporated into the final LED device. This pre-forming approach allows the slit structure to be established while particles are still in a manageable state, enabling subsequent handling and assembly processes to proceed without additional complex steps. The slits are created during a dedicated surface treatment stage, separating this function from the main phosphor synthesis process.

The invention replaces complex mechanical slit formation methods with chemical etching or self-organized surface modification processes. Instead of using mechanical tools to create slits on hard phosphor particles, the invention employs chemical reactions or controlled surface treatments that naturally form the desired slit structures. This substitution of mechanical processes with chemical or self-organizing processes significantly reduces manufacturing complexity while achieving precise slit geometries.