Denka Company Limited

Motoi Tanaka

Hideyuki Emoto

Kazuhiro Ito

Masayoshi Ichikawa

Ryosuke Kondo

The present invention relates to a process for producing a composite-fluoride fluorescent material represented by the general formula AMF:Mn(wherein A is at least one alkali metal element including K; M is one or more metallic elements including at least Si or Ge and selected from among Si, Ge, Sn, Ti, Zr, and Hf; F is fluorine; and Mn is manganese). With the production process, it is possible to obtain a fluorescent material which is high in absorptance, internal quantum efficiency, and external quantum efficiency and has excellent optical properties.

Process for producing fluorescent material

Provided is a phosphor represented by the general formula: AMF:Mn. The elements A each represents an alkali metal element, the element M represents one or more tetravalent metallic elements selected from Si, Ge, Sn, Ti, Zr and Hf. The phosphor has a minimal light absorption rate in a wavelength range of 300 nm or more and 350 nm or less of 67% or less, and a maximum light absorption rate in a wavelength range of 400 nm or more and 500 nm or less of 65% or more. The phosphor has a Mn content of 0.3% by mass or more and 1.5% by mass or less.

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Fukuoka, Japan

Motoi Tanaka