PREPARATION OF GALLIUM NITRIDE FLUORESCENT SUBSTANCE, PREPARATION OF GALLIUM OXIDE AND GALLIUM OXIDE

摘要

PROBLEM TO BE SOLVED: To provide a preparation process of a GaN fluorescent substance having a good crystallinity. SOLUTION: Gallium hydroxide is obtained by adding ammonia dropwise to gallium nitrate hydride. This gallium hydroxide is introduced into an oven pre-heated to 800 deg.C to remove moisture at once. Spongy, porous gallium oxide having a specific surface area which is twice as large as that of conventional gallium oxide, is obtained. This porous gallium oxide is allowed to react in an ammonium atmosphere at 1,000 deg.C for two hours to obtain a powdery GaN. Conventional GaN prepared using conventional gallium oxide as a material had a black pigmentation containing tan-colored parts. GaN obtained here is tan-colored with no blackened part. GaN obtained here has a sphere-like form wherein the particle size is distributed within from 0.5 to 2μm, and was proved to have an improved crystallinity than that of the conventional GaN through an X-ray diffraction analysis.