Organic electroluminescent element material and organic electroluminescent element using same

1. An organic electroluminescent device material, comprising a carborane compound represented by formula (1):

in formula (1):

a ring CB represents a divalent carborane group —C 2 B 10 H 10 — represented by any one of the formula (a), the formula (b), and the formula (c), and when a plurality of rings CB are present in a molecule, the rings may be identical to or different from each other;

R represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 12 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 50 carbon atoms, and a plurality of R's may be identical to or different from each other;

A represents a direct bond, an Si(R) d group, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 50 carbon atoms, provided that A does not represent a direct bond except when p+m represents 2, and A represents a p+m-valent group when A represents a direct bond, R of the Si(R) d group has the same meaning as that of the R, and d represents an integer represented by 4−(p+m); and

p represents an integer of from 0 to 3, m represents an integer of from 1 to 4, n represents an integer of from 0 to 3, and p+m represents an integer of from 1 to 4.

2. An organic electroluminescent device material according to claim 1 , wherein the organic electroluminescent device material comprises a carborane compound represented by formula (2):

in formula (2), a ring CB, R, and A have the same meanings as those of the ring CB, R, and A of formula (1), p represents an integer of from 0 to 3, and n represents an integer of from 0 to 3.

3. An organic electroluminescent device material according to claim 1 , wherein in formula (1), m represents 1 and the ring CB represents a divalent carborane group represented by the formula (b).

4. An organic electroluminescent device material according to claim 1 , wherein in formula (1), p represents 0.

5. An organic electroluminescent device, comprising:

a substrate;

an anode;

an organic layer; and

a cathode,

the anode, the organic layer, and the cathode being laminated on the substrate,

wherein the organic layer comprises at least one layer selected from the group consisting of a light-emitting layer, a hole-transporting layer, an electron-transporting layer, an electron-blocking layer, and a hole-blocking layer, the at least one layer containing the organic electroluminescent device material according to claim 1 .

6. An organic electroluminescent device according to claim 5 , wherein the light-emitting layer contains the organic electroluminescent device material and a phosphorescent light-emitting dopant.

7. An organic electroluminescent device material according to claim 2 , wherein p represents 1 or 2, and n represents 0 to 2.

8. An organic electroluminescent device material according to claim 2 , wherein p represents 0, and n represents 0 to 2.

9. An organic electroluminescent device, comprising:

a substrate;

an anode;

an organic layer; and

a cathode,

the anode, the organic layer, and the cathode being laminated on the substrate,

wherein the organic layer comprises at least one layer selected from the group consisting of a light-emitting layer, a hole-transporting layer, an electron-transporting layer, an electron-blocking layer, and a hole-blocking layer, the at least one layer containing the organic electroluminescent device material according to claim 8 .