ORGANIC-ELECTROLUMINESCENT-ELEMENT MATERIAL AND ORGANIC ELECTROLUMINESCENT ELEMENT USING SAME

摘要

Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction. The device is an organic electroluminescent device having organic layers including a light-emitting layer between an anode and a cathode laminated on a substrate, in which a carborane compound is incorporated into at least one layer of the organic layers, or is incorporated as a host material into a light-emitting layer containing a phosphorescent light-emitting dopant and the host material. The carborane compound has a structure in which a N-containing fused aromatic ring is bonded to a carborane ring. The N-containing fused aromatic ring is a quinoline ring or has a structure obtained by substituting 1 to 3 ring-forming carbon atoms in a quinoline ring with N atoms.

主权项

1. A material for an organic electroluminescent device, comprising a carborane compound represented by the general formula (1):where:
rings A's each independently represent a divalent carborane group C2B10H10 represented by the formula (1a) or the formula (1b), and when the plurality of rings A's are present in a molecule, the rings may be identical to or different from each other, s's each independently represent a number of repetitions and an integer of from 1 to 4, m and n each represent a number of substitutions, and m represents an integer of from 0 to 4 and n represents an integer of from 0 to 6, provided that when m=1, s=1; X's each independently represent N, CH, or C, and 1 to 4 of X's each represent N; R represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 30 carbon atoms, or a linked aromatic group formed by linking 2 to 6 of the substituted or unsubstituted aromatic rings, the linked aromatic group may be linear or branched, and the aromatic rings to be linked may be identical to or different from each other; L1 represents a single bond, an m+1-valent substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms, an m+1-valent substituted or unsubstituted aromatic heterocyclic group having 3 to 30 carbon atoms, or an m+1-valent linked aromatic group formed by linking 2 to 6 of the substituted or unsubstituted aromatic rings, the linked aromatic group may be linear or branched, and the aromatic rings to be linked may be identical to or different from each other, and when m=1, L1 represents a group containing at least one aromatic heterocyclic group or a single bond; and L2's each independently represent a single bond, a divalent substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms, a divalent substituted or unsubstituted aromatic heterocyclic group having 3 to 30 carbon atoms, or a divalent linked aromatic group formed by linking 2 to 6 of the substituted or unsubstituted aromatic rings, the linked aromatic group may be linear or branched, and the aromatic rings to be linked may be identical to or different from each other, and L2-H at a terminal may represent an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms.