Ube Material Industries, Ltd.

Ube Industries, Inc.

Masaki Tanaka

Toru Inagaki

Kouichi Fukuda

Jin Amagai

Seiji Noguchi

Kaoru Takazaki

Tatsunori Sakaguchi

The present invention is a fluorescent material characterized by being represented by a composition of the following formula (1) and having a crystal lattice distortion obtained from a Williamson-Hall plot by X-ray diffraction within the range of 0.0005 to 0.0020.(Sr,Ca,M)MgSiO:Eu&#x2003;&#x2003;formula (1)wherein M is at least one rare earth metal elements selected from the group consisting of Sc, Y, Gd, Tb and La, and 0.01&#x2264;x&#x2264;0.10. Also, the present invention is a light-emitting device including the fluorescent material, and a light source that emits light by irradiating the fluorescent material with excitation light. Furthermore, the present invention is a method for producing the fluorescent material, including the steps of: obtaining an aqueous slurry of a raw material; and spray-drying the aqueous slurry with hot air at 80 to 300&#xb0; C.

Fluorescent material, light-emitting device, and method for producing fluorescent material

A silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface which is obtained by a method of heating a mixture of 100 weight parts of a silicate phosphor and 0.5-15 weight parts of ammonium fluoride at a temperature in the range of 200 to 600&#xb0; C. exhibits high light emission intensity and high moisture resistance.

Silicate phosphor exhibiting high light emission characteristics and moisture resistance, and light emitting device

The emission strength of a light released from a blue light-emitting phosphor having a merwinite crystal structure and an elemental formula of (Sr,Ca)MgSiOactivated with Eu in which a molar ratio of Sr and Ca is in the range of 1:0.10 to 1:0.30 is stable in a wide temperature range.

Blue light-emitting phosphor and light-emitting device using the blue light-emitting phosphor

Growing community of inventors

Ube, Japan

Masaki Tanaka