Arylamine compound and organic electroluminescent device
The present invention provides an arylamine compound having a molecular weight of from 1500 to 6000 represented by the general formula (1): According to the present invention, there can be provided an arylamine compound having excellent hole injection and transporting characteristics and being capable of forming a stable thin film. By using the compound, emission efficiency and durability of conventional organic EL devices can remarkably be improved.
1. An arylamine compound having a molecular weight of from 1500 to 6000 represented by formula (I):
wherein X represents a single bond, CH, CH 2 , N or NH; Ar 1 , Ar 2 and Ar 3 represent a biphenyl group or a terphenyl group; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently represent an aryl group, wherein the aryl group may be substituted with a diarylamino group so as to form a triarylamine moiety structure, and further the terminal aryl groups may be substituted with a diarylamino structure group-containing group so as to form a triarylamine sub-structure repeatedly; and n is 0 or 1.
2. The arylamine compound as claimed in claim 1 , having 9 or 10 nitrogen atoms in its molecule.
3. The arylamine compound as claimed in claim 2 , having 10 nitrogen atoms in its molecule.
4. The arylamine compound as claimed in any one of claims 1 to 3 , having from 7 to 9 triarylamine sub-structures in its molecule.
5. An organic electroluminescence device comprising a pair of electrodes, and at least one organic layer interposed therebetween, wherein the device comprises a compound having a molecular weight of from 1500 to 6000 represented by formula (1) as a constituent material of the at least one organic layer:
wherein X represents a single bond, CH, CH 2 , N or NH; Ar 1 , Ar 2 and Ar 3 represent a biphenyl group or a terphenyl group; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently represent an aryl group, wherein the aryl group may be substituted with a diarylamino group so as to form a triarylamine moiety structure, and further the terminal aryl groups may be substituted with a diarylamono structure group-containing group so as to form a triarylamine sub-structure repeatedly; and n is 0 or 1.
6. The organic electroluminescence device as claimed in claim 5 , wherein the arylamine compound has 9 or 10 nitrogen atoms in its molecule.
7. The organic electroluminescence device as claimed in claim 6 , wherein the arylamine compound has 10 nitrogen atoms in its molecule.
8. The organic electroluminescence device as claimed in any one of claims 5 to 7 , wherein the arylamine compound has from 7 to 9 triarylamine sub-structures in its molecule.