Organic electroluminescence device and anthracene derivative

A light emitting material for an organic electroluminescence device, comprising an anthracene derivative of formula (2):

• wherein
• Ar is selected from the group consisting of 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group, and a fluoranthenyl group, each being optionally substituted;
• Ar′ is selected from the group consisting of a phenyl group, 1-anthryl group, 2-anthryl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group, 1-naphthyl group, 2-naphthyl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 9-phenanthryl group 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group and fluoranthenyl group, each being optionally substituted;
• X is a substituted or unsubstituted aromatic group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, a substituted or unsubstituted aryloxyl group having 5 to 50 nuclear atoms, a substituted or unsubstituted arylthio group having 5 to 50 nuclear atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, carboxyl group, a halogen atom, cyano group, nitro group or hydroxyl group;
• a and b are each an integer of 0 to 4;
• and
• n is an integer of 1 to 3 and, when n represents 2 or 3, two or three groups represented by:
• may each be the same or different, and
• wherein the light emitting material is located in the light emitting layer of an organic electroluminescence device.