Nitrogenous heterocyclic derivative and organic electroluminescence device making use of the same
A novel nitrogen-containing heterocyclic compound having a specific structure and an organic electroluminescence device comprising an anode, a cathode and an organic thin film layer which comprises a single layer or a plurality of layers comprising at least a light emitting layer and is disposed between the anode and the cathode, wherein at least one layer in the organic thin film layer comprises the above nitrogen-containing heterocyclic derivative singly or as a component of a mixture. The organic electroluminescence device exhibits a great luminance of emitted light and a great efficiency of light emission even under application of a low voltage.
1. A compound represented by a formula selected from the group consisting of (1-a), (1-b), (1-c), (2-a), (2-b), and (2-c)
wherein R 11 to R 18 each independently represent a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 50 ring atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 ring atoms, a substituted or unsubstituted aryloxy group having 5 to 50 ring atoms, a substituted or unsubstituted arylthio group having 5 to 50 ring atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, an amino group substituted with a substituted or unsubstituted aryl group having 5 to 50 ring atoms, a halogen atom, a cyano group, a nitro group, a hydroxy group or a carboxy group;
HAr 1 and HAr 2 each independently represent a monovalent group formed by removing a hydrogen atom from any one of R 1a to R 6a in formula (a):
in formula (a), R 1a to R 6a each independently representing a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 50 ring atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 ring atoms, a substituted or unsubstituted aryloxy group having 5 to 50 ring atoms, a substituted or unsubstituted arylthio group having 5 to 50 ring atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, an amino group substituted with a substituted or unsubstituted aryl group having 5 to 50 ring atoms, a halogen atom, a cyano group, a nitro group, a hydroxy group or a carboxy group.
2. The compound according to claim 1 , represented by formula (1-a).
3. The compound according to claim 1 , represented by formula (1-b).
4. The compound according to claim 1 , represented by formula (1-c).
5. The compound according to claim 1 , represented by formula (2-a).
6. The compound according to claim 1 , represented by formula (2-b).
7. The compound according to claim 1 , represented by formula (2-c).