| abstract |
The oxynitride-based phosphor having an orthorhombic crystal structure and represented by the following general formula (1) is excited by light in the near ultraviolet or blue region to emit red or yellow red light, and has a crystal structure with a lattice constant different from conventional ones The efficiency of photoluminescence is improved, and the luminance is excellent, and the photoluminescence efficiency is hardly lowered even under severe conditions such as high temperature and high humidity. Accordingly, the white light emitting device including the phosphor can emit white light of a high luminance and a whitish color, and is excellent in color rendering property, color reproducibility and color controllability: [Chemical Formula 1] AAlSiN 3 : zEu 2+ In this formula, A is Sr, Ba or a combination thereof, 0.001? Z? 0.3. |