Organic electroluminescent element material, organic electroluminescent element composition, organic electroluminescent element, display device, and lighting device

1. A polymer, which has a weight-average molecular weight (Mw) of 20,000 or more and a degree of dispersion (Mw/Mn) of 2.5 or less, comprising a repeating unit represented by the following general formula (1) and a cross-linkable group:

wherein:

Ar 11 is a biphenylene group or a terphenylene group,

Ar 12 and Ar 13 each independently represents a divalent aromatic group which may have a substituent,

Ar 14 and Ar 15 each independently represents an aromatic group which may have a substituent,

Ar 16 and Ar 17 each independently represents a direct bond or a divalent aromatic group which may have a substituent, with the proviso that at least one of Ar 16 and Ar 17 represents a divalent aromatic group which may have a substituent,

R 11 and R 12 each independently represents a hydrogen atom, an alkyl group which may have a substituent, or an alkoxy group which may have a substituent,

r represents an integer of from 0 to 5, and

R 11 and R 12 may be connected to each other to form a ring structure,

wherein the repeating unit represented by the above-described general formula (1) may contain the cross-linkable group, and

wherein the cross-linkable group is at least one group selected from the group T of the following cross-linkable groups:

wherein:

R 21 to R 23 each independently represents a hydrogen atom or an alkyl group which may have a substituent,

Ar 21 represents an aromatic group which may have a substituent,

X 1 , X 2 , and X 3 each independently represents a hydrogen atom or a halogen atom, and

R 24 represents a hydrogen atom or a vinyl group,

wherein the benzocyclobutene ring may have substituent(s), and the substituents may be connected to each other to form a ring.

2. An organic electroluminescent element material comprising the polymer of claim 1 .

3. An organic electroluminescent element composition comprising the polymer of claim 1 .

4. An organic electroluminescent element comprising, on a substrate, an anode, a cathode, and one or more organic layers provided between these two electrodes, wherein at least one of the organic layers contains a network polymer formed by cross-linking the polymer of claim 1 .

5. The organic electroluminescent element according to claim 4 , wherein the layer containing the network polymer is a hole injection layer or a hole-transporting layer.

6. The organic electroluminescent element according to claim 4 , wherein the layer containing the network polymer is a hole-transporting layer.

7. The organic electroluminescent element according to claim 5 , which further comprises a luminescent layer, and all of the hole injection layer, the hole-transporting layer, and the luminescent layer are formed by a wet film formation method.

8. A display device comprising the organic electroluminescent element of claim 4 .

9. A lighting device comprising the organic electroluminescent element of claim 4 .

10. The polymer according to claim 1 , wherein the number of the cross-linkable groups which the polymer has per 1000 molecular weight, is from 0.01 to 3.0.

11. The polymer according to claim 1 , wherein the number of the cross-linkable groups which the polymer has per 1000 molecular weight, is from 0.01 to 2.0.

12. The polymer according to claim 1 , wherein the number of the cross-linkable groups which the polymer has per 1000 molecular weight, is from 0.05 to 1.0.

13. The polymer according to claim 1 , wherein the cross-linkable group is a group represented by formula (II-a):

wherein the benzocyclobutene ring in formula (II-a) may have substituent(s), and the substituents may be connected to each other to form a ring.

14. The polymer according to claim 1 , wherein Ar 11 is a biphenylene group.

15. The polymer according to claim 1 , wherein Ar 11 is a terphenylene group.