Silicate-based blue light-emitting phosphor and method for producing same

摘要

A blue light-emitting silicate phosphor favorably employable as a blue light-emitting source of a light-emitting apparatus which gives emission of a visible light upon irradiation of ultraviolet rays having a wavelength of 254 nm, such as ultraviolet rays emitted by a fluorescent lamp is produced by a method comprising calcining a powdery mixture comprising a magnesium oxide powder, an MeO source powder, a EuO source powder and a SiO2 source powder, said magnesium oxide powder having a purity of 99.9 wt. % or higher and a BET specific surface area in the range of 3 to 60 m2/g and having been prepared by bringing a metallic magnesium vapor into contact with oxygen whereby oxidizing the metallic magnesium vapor.

主权项

1. A method for producing a blue light-emitting silicate phosphor having the following composition formula (I):
3(Me1-x,Eux)O.aMgO.bSiO2  (I) wherein Me is Sr or a mixture of Sr and Ca, x is a number in the range of 0.001 to 0.110, a is a number in the range of 0.9 to 1.1, and b is a number in the range of 1.8 to 2.2, which comprises calcining a powdery mixture comprising a magnesium oxide powder, one of a combination of SrCO3 and SrCl2 and a combination of SrCO3, SrCl3 and CaCO3, a EuO source powder and a SiO2 source powder, said magnesium oxide powder having a purity of 99.9 wt. % or higher and a BET specific surface area in the range of 3 to 60 m2/g, in which the magnesium oxide powder has been prepared by bringing a metallic magnesium vapor into contact with oxygen whereby oxidizing the metallic magnesium vapor.