Mitsubishi Chemical Corporation

Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Kanzi Shimizu

Toshio Hihara

Yukiharu Shimizu

Kiyoshi Himeno

Tetsuo Murayama

Masahiko Yoshino

Akiko Yabe

Takayuki Shoda

Toshio Niwa

The present invention is to provide a light emitting device which can generate high-intensity light emission, using a fluorescent material containing a rare earth element ion complex and being excellent in durability and also provide the fluorescent material to be used therein. The present invention relates to a light emitting device comprising a semiconductor light emitting element which emits light within the region from near-ultraviolet light to visible light, and a fluorescent material which contains a rare earth element ion complex having an aromatic ring-containing Bronsted acid ion with a pKa value of 7 or less as a ligand and emits light by the action of light of the semiconductor light emitting element.

Light emitting device and fluorescent material

A water-soluble monoazo colorant represented by formula (I) in a form of a free acid: ##STR1## wherein D represents ##STR2## (wherein W.sup.2 represents lower alkoxy; U represents lower alkyl or lower alkoxy; Z represents --CH.dbd.CH.sub.2 or --CH.sub.2 CH.sub.2 OSO.sub.3 H and p and q represent each 0 or 1);

Water soluble monoazo dye-stuffs containing vinylsulfone and

A water-soluble formazan colorant, which is represented by the following general formula (I) in the form of free acid: ##STR1## (where: R represents a hydrogen atom or a lower alkyl group which may be substituted; X denotes a phenylene group or a naphthylene group which may be substituted; Y indicates --SO.sub.2 CH.dbd.CH.sub.2 group or --SO.sub.2 C.sub.2 H.sub.4 W group wherein W represents a group to be eliminated by the action of alkali; and Z designates a lower alkylamino group, a phenylamino group or a naphthylamino group, having one or two water-soluble groups selected from the group consisting of hydroxyl group, sulfonic acid group and carboxylic acid group); and a method of dyeing by use of the colorant. The colorant is used to dye cellulosic and nitrogen-containing fibers in blue shades with excellent reactive fixing properties.

Water-soluble formazan colorant containing reactive group and method of

A water soluble disazo colorant represented by formula (I) in the form of free acid: ##STR1## wherein K represents ##STR2## [wherein A represents a methyl group or a carboxylic group; R.sup.2 represents a hydrogen atom, an alkyl group of 1 to 8 carbon atoms, a sulfoalkyl grouop of 1 to 4 carbon atoms, or an alkyl group of 1 to 4 carbon atoms which is substituted by an alkoxy group of 1 to 4 carbon atoms;

Pyrazolone or pyridone type water soluble disazo colorant containing one

A reactive phthalocyanine dye having a specific substituent capable of dyeing cellulose fibers or a mixed fibers of polyester fibers and cellulose fibers to provide Turkish blue-dyed fibers excellent in color fastness to light and color fastness to washing is disclosed, which is represented by general formula [I] ##STR1##

Growing community of inventors

Kanagawa, Japan

Kanzi Shimizu