Organic electroluminescence element and display medium

1. An organic electroluminescence element comprising:

a pair of electrodes composed of a positive electrode and a negative electrode, one of which is transparent or semitransparent; and

one or more organic compound layers that are sandwiched between the pair of electrodes, in which at least one layer of the organic compound layers contains one or more of charge-transporting polyesters represented by the following formula (I):

in formula (I), A 1 represents a group selected from a structure shown by the following formula (II), Y 1 and Y 2 each independently represents a substituted or unsubstituted divalent hydrocarbon group, m1 and m2 each independently represents an integer of 1 to 5, and p represents an integer of 5 to 5000; R 1 and R 2 each independently represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group,

in formula (II), Ar 1 and Ar 2 each independently represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted monovalent polynuclear aromatic hydrocarbon group having an aromatic ring number of 2, a substituted or unsubstituted monovalent condensed aromatic hydrocarbon group having an aromatic ring number of 2 or 3, or a substituted or unsubstituted monovalent aromatic heterocycle group, j1 and j2 each independently represents 0 or 1, T 1 and T 2 each independently represents a divalent straight-chain hydrocarbon group having a carbon number of 1 to 6 or a divalent branched-chain hydrocarbon group having a carbon number of 2 to 10, and X represents a group selected from the following formula (III-1) and the following formula (III-2),

in formula (III-1), q1 and q2 each independently represents 0 or 1.

2. The organic electroluminescence element according to claim 1 ,

wherein the organic compound layers include a light-emitting layer, and at least one layer of an electron-transporting layer and an electron-injecting layer; and at least one layer selected from the light-emitting layer, the electron-transporting layer, and the electron-injecting layer contains one or more of charge-transporting polyesters represented by formula (I).

3. The organic electroluminescence element according to claim 1 ,

wherein the organic compound layers include a light-emitting layer, and at least one layer of a hole-transporting layer and a hole-injecting layer; and at least one layer selected from the light-emitting layer, the hole-transporting layer, and the hole-injecting layer contains one or more of charge-transporting polyesters represented by formula (I).

4. The organic electroluminescence element according to claim 1 ,

wherein the organic compound layers include a light-emitting layer, at least one layer of a hole-transporting layer and a hole-injecting layer, and at least one layer of an electron-transporting layer and an electron-injecting layer; and at least one layer selected from the light-emitting layer, the hole-transporting layer, the hole-injecting layer, the electron-transporting layer, and the electron-injecting layer contains one or more of charge-transporting polyesters represented by formula (I).

5. The organic electroluminescence element according to claim 1 ,

wherein the organic compound layer is composed of only a light-emitting layer having a charge-transporting function; and the light-emitting layer having a charge-transporting function contains one or more of charge-transporting polyesters represented by formula (I).

6. The organic electroluminescence element according to claim 1 ,

wherein p in formula (I) is in a range of about 10 to about 1000.

7. The organic electroluminescence element according to claim 1 ,

wherein the weight-average molecular weight of the charge-transporting polyester is in a range of about 10,000 to about 100,000.

8. The organic electroluminescence element according to claim 1 ,

wherein the glass transition temperature of the charge-transporting polyester is in a range of about 60° C. to about 300° C.

9. A display medium, comprising the organic electroluminescence elements according to claim 1 arranged in a matrix shape or in a segment shape.

10. A display medium, comprising the organic electroluminescence elements according to claim 2 arranged in a matrix shape or in a segment shape.

11. A display medium, comprising the organic electroluminescence elements according to claim 3 arranged in a matrix shape or in a segment shape.

12. A display medium, comprising the organic electroluminescence elements according to claim 4 arranged in a matrix shape or in a segment shape.