| abstract |
A brighter β-sialon phosphor that can be used for a fluorescent display tube (VFD), a field emission display (FED), a plasma display panel (PDP), a cathode ray tube (CRT), a light emitting diode (LED), etc. provide. An α-type silicon nitride particle having a particle size of 2 μm or more and an average aspect ratio of 1.3 or less, an aluminum source material containing AlN, and an oxide of metal Ln or an oxide by thermal decomposition. The precursor material is mixed so as to have the general formula Si 6-z Al z O z N 8-z : Ln x (where 0 <z <4.2, Ln is Eu), 0.05 MPa to 100 MPa By baking at 1700-2100 ° C. in the following nitrogen atmosphere, a novel high-brightness β-sialon phosphor powder having an average aspect ratio of less than 1.5 can be obtained. [Selection figure] None |