Fluorescent substance and process for producing the same, and luminescent element using the same

US8125139B2 · kind B2 · utility

Assignee

• DENKI KAGAKU KOGYO KABUSHIKI KAISHA · JP

Inventors

• Hideyuki Emoto · Oomuta, JP
• Masahiro Ibukiyama · Tokyo, JP
• Kenji Nomura · Amagasaki, JP

Key dates

• Filing date: Feb 28, 2006
• Grant date: Feb 28, 2012
• Expiry date: Jun 14, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Provided is a phosphor material for a white LED with a blue LED or ultraviolet LED as a light source.A phosphor comprises an α-sialon represented by the formula: (M1)X(M2)Y(Si)12−(m+n)(Al)m+n(O)n(N)16−n where M1 is at least one element selected from the group consisting of Li, Mg, Ca, Y and lanthanide metals (except for La and Ce), M2 is at least one element selected from Ce, Pr, Eu, Tb, Yb and Er, 0.3≦X+Y≦1.5, 0<Y≦0.7, 0.6≦m≦3.0, 0≦n≦1.5 and X+Y=m/2; and the oxygen content in a powder of the α-sialon is at most 0.4 mass % larger than a value calculated based on the formula.