Organic eletroluminescent element including polyester electronic material and display device including the same

1. An organic electroluminescent element comprising:

a pair of electrodes including a positive electrode and a negative electrode, with at least one of the electrodes being transparent or semi-transparent; and

one or more organic compound layers interposed between the pair of electrodes, with at least one layer containing one or more charge transporting polyesters represented by the following formula (I):

wherein in the formula (I), A 1 represents at least one selected from structures represented by the following formula (II); Y 1 s each independently represent a substituted or unsubstituted divalent hydrocarbon group; m's each independently represent an integer of from 1 to 5; p represents an integer of from 5 to 5,000; R 1 s each independently represent a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group;

wherein in the formula (II), Ar's each independently represent a substituted or unsubstituted phenyl group, a substituted or unsubstituted monovalent polynuclear aromatic hydrocarbon group having two aromatic rings, a substituted or unsubstituted monovalent condensed aromatic hydrocarbon group having two or three aromatic rings, or a substituted or unsubstituted monovalent aromatic heterocyclic group; j's each independently represent 0 or 1; T's each independently represent a divalent linear hydrocarbon group having from 1 to 6 carbon atoms, or a divalent branched hydrocarbon group having from 2 to 10 carbon atoms; and X represents a group represented by the following formula (III):

2. The organic electroluminescent element of claim 1 , wherein the organic compound layers include a light emitting layer, at least one layer of a hole transport layer and a hole injection layer, and at least one layer of an electron transport layer and an electron injection layer, and at least one layer selected from the light emitting layer, the hole transport layer, the hole injection layer, the electron transport layer and the electron injection layer contains one or more charge transporting polyesters represented by the formula (I).

3. The organic electroluminescent element of claim 1 , wherein the organic compound layers are formed only of a light emitting layer having a charge transport function, and the light emitting layer having a charge transport function contains one or more charge transporting polyesters represented by the formula (I).

4. A display medium comprising the organic electroluminescent element of claim 1 arranged in at least one of a matrix form and a segment form.

5. The organic electroluminescent element of claim 1 , wherein the organic compound layers include a light emitting layer and at least one layer of an electron transport layer and an electron injection layer, and at least one layer selected from the light emitting layer, the electron transport layer and the electron injection layer contains one or more charge transporting polyesters represented by the formula (I).

6. A display medium comprising the organic electroluminescent element of claim 5 arranged in at least one of a matrix form and a segment form.

7. The organic electroluminescent element of claim 1 , wherein the organic compound layers include a light emitting layer and at least one layer of a hole transport layer and a hole injection layer, and at least one layer selected from the light emitting layer, the hole transport layer and the hole injection layer contains one or more charge transporting polyesters represented by the formula (I).

8. A display medium comprising the organic electroluminescent element of claim 7 arranged in at least one of a matrix form and a segment form.