| abstract |
The present invention provides a higher brightness β-sialon phosphor that can be used for fluorescent display tubes (VFD), field emission displays (FED), plasma display panels (PDP), cathode ray tubes (CRT), light emitting diodes (LEDs), and the like. do. Α-type silicon nitride particles having a particle diameter of 2 µm or more and an average value of aspect ratio of 1.3 or less, a material serving as an aluminum source containing AlN, and a precursor material becoming an oxide by metal Ln oxide or pyrolysis; Si 6-z Al z O z N 8-z : Ln x (wherein O <z <4.2, Ln is Eu) and mixed so as to be 1700 ° C to 2100 ° C in a nitrogen atmosphere of 0.05 MPa or more and 100 MPa or less. By firing at, a novel high-brightness β-sialon phosphor powder having an average value of aspect ratio of less than 1.5 can be obtained. |