Polymer compound, net-like polymer compound produced by crosslinking the polymer compound, composition for organic electroluminescence element, organic electroluminescence element, organic EL display, and organic EL lighting
View Patent ↗An object of the invention is to provide a polymer compound having a high hole transport capacity, excellent in electrochemical stability, and suitable to film formation according to a wet film formation method. Another object of the invention is to provide an organic electroluminescence element having a high current efficiency, a low drive voltage, and a long derive lifetime. The polymer compound has a crosslinking group bonding to the arylamine moiety in the repeating unit via at least one single bond therebetween.
1. A polymer compound comprising a repeating unit represented by the following formula (I):
wherein R 1 and R 2 each independently represent a hydrogen atom, an aromatic hydrocarbon group optionally having a substituent except a crosslinking group, an aromatic heterocyclic group optionally having a substituent except a crosslinking group, or an alkyl group optionally having a substituent except a crosslinking group, R 1 and R 2 may bond to each other to form a ring;
n indicates an integer of from 0 to 3;
Ar 1 and Ar 2 each independently represent a direct bond, an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent;
Ar 3 to Ar 5 each independently represent an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent;
T represents a group comprising a crosslinking group, wherein the crosslinking group is selected from the group of crosslinking groups consisting of:
wherein R 21 and R 23 to R 25 each independently represent a hydrogen atom or an alkyl group; Ar 41 represents an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent;
the benzocyclobutene ring may have a substituent;
the substituents may together form a ring,
provided that when Ar 1 , Ar 2 and Ar 4 are fluorene rings, then they do not have a group comprising a crosslinking group as the substituent.
2. The polymer compound as claimed in claim 1 , further comprising a repeating unit represented by the following formula (I′):
wherein R 11 and R 12 each independently represent a hydrogen atom, an aromatic hydrocarbon group optionally having a substituent, an aromatic heterocyclic group optionally having a substituent, or an alkyl group optionally having a substituent, R 11 and R 12 may bond to each other to form a ring;
m indicates an integer of from 0 to 3;
Ar 11 and Ar 12 each independently represent a direct bond, an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent;
Ar 13 to Ar 15 each independently represent an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent;
provided that R 11 and R 12 , and Ar 11 to Ar 15 do not have a crosslinking group as the substituent.
3. A net-like polymer compound produced by a process comprising crosslinking the polymer compound of claim 1 .
4. An organic electroluminescence element comprising, on a substrate, an anode, a cathode and an organic layer between the anode and the cathode,
wherein the organic layer comprises a layer comprising the net-like polymer compound of claim 3 .
5. The organic electroluminescence element as claimed in claim 4 ;
wherein the organic layer comprises a hole injection layer, a hole transport layer and a light emission layer, and
all of the hole injection layer, the hole transport layer and the light emission layer are formed according to a wet film formation method.
6. An organic EL display, comprising the organic electroluminescence element of claim 4 .
7. An organic EL lighting, comprising the organic electroluminescence element of claim 4 .
8. The organic electroluminescence element as claimed in claim 4 , wherein the layer comprising the net-like polymer compound is a hole injection layer or a hole transport layer.
9. A composition for organic electroluminescence element, comprising the polymer compound of claim 1 .