Organic electroluminescent element and display

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

an organic compound layer interposed between the pair of electrodes and 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 and Y 2 each independently represent a substituted or unsubstituted divalent hydrocarbon group;

m 1 and m 2 each independently represent an integer of from 1 to 5;

p represents an integer of from 5 to 5,000; and

R 1 and R 2 each independently represent a hydrogen atom or a phenyl group;

wherein in the formula (II),

Ar 1 and Ar 2 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 1 and j 2 each independently represent 0 or 1;

T 1 and T 2 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 layer includes 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).

3. The organic electroluminescent element of claim 1 , wherein the organic compound layer includes 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).

4. The organic electroluminescent element of claim 1 , wherein the organic compound layer is 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).

5. The organic electroluminescent element of claim 1 , wherein Ar 1 and Ar 2 in the formula (II) are the same.

6. The organic electroluminescent element of claim 1 , wherein the weight average molecular weight Mw of the charge transporting polyester is in the range of from 5,000 to 300,000.

7. The organic electroluminescent element of claim 1 , wherein p in the formula (I) is an integer in the range of from 10 to 1,000.

8. The organic electroluminescent element of claim 1 , wherein the glass transition temperature (Tg) of the charge transporting polyester is in the range of from 60° C. to 300° C.

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

10. A display comprising the organic electroluminescent element of claim 2 arranged in at least one of a matrix form and a segment form.

11. A display comprising the organic electroluminescent element of claim 3 arranged in at least one of a matrix form and a segment form.

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

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

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