Patent ID: 8372308
Filing Date: 2013-02-12
Classification: C09K

Abstract:
1. A method of producing a blue light-emitting phosphor represented by a basic compositional formula of CaMgSi 2 O 6 :Eu 2+ , comprising preparing a powder mixture by mixing a calcium source powder having a purity of 99 mass % or more, a europium source powder having a purity of 99 mass % or more, a magnesium source powder having a purity of 99 mass % or more and a silicon source consisting essentially of silicon diimide powder in a ratio producing a blue light-emitting phosphor having a diopside crystal structure represented by a basic compositional formula of CaMgSi 2 O 6 :Eu 2+ to prepare a powder mixture, said powder mixture consisting essentially of said calcium source powder, said europium source powder, said magnesium source powder and said silicon source consisting essentially of silicon diimide powder, and subjecting said powder mixture to heating at a temperature of 400 to 1,000° C. in an oxygen-containing gas atmosphere to cause partial oxidative decomposition of the silicon source consisting essentially of silicon diimide powder wherein remaining imide group from silicon diimide presents in the powder mixture, and then firing at a temperature of 800 to 1,500° C. in a reducing gas atmosphere.