Light emitting device and fluorescent material
View Patent ↗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.
1. A fluorescent material containing a rare earth element ion complex having as a ligand a Bronsted acid ion represented by the following general formula (4):
wherein R 1 is a group containing a tricyclic aromatic hydrocarbon ring or a tricyclic aromatic heterocycle, each optionally having a substituent group, R 2 is a phenylene or a naphthylene group, Q represents a carbon, sulfur or phosphorous atom, a represents 1 or 2, m represents 0 or 1, and p represents 0 or 1.
2. The fluorescent material according to claim 1 , wherein said rare earth element ion complex has a Lewis base as an auxiliary ligand.
3. The fluorescent material according to claim 1 , wherein Q is carbon and p is 0.
4. The fluorescent material according to claim 1 , wherein said rare earth element ion complex is a europium complex.
5. The fluorescent material according to claim 1 , wherein m is 1.
6. The fluorescent material according to claim 1 , wherein the tricyclic aromatic heterocycle is a tricyclic aromatic heterocycle comprising a sulfur atom.