ORGANIC ELECTROLUMINESCENCE DEVICE

1 - 17 . (canceled)

18 . An organic electroluminescence device comprising, on a substrate:

a pair of electrodes; and

at least one organic layer between the pair of electrodes, the organic layer including a light-emitting layer containing a light-emitting material,

wherein the light-emitting layer contains at least each of a compound represented by the following formula (1) and a compound represented by the following formula (D-1):

wherein R 11 to R 18 each independently represent a hydrogen atom, an alkyl group, or an aryl group; and

Cz 11 and Cz 12 each independently represent the following partial structure (Cz-1):

wherein R 19 to R 116 each independently represent a hydrogen atom or an alkyl group;

S 11 represents a group represented by the following (a), (b), (c), (d) or (e), which is substituted for any one of R 19 to R 112 ; and

n represents an integer of 0 or 1:

wherein R 1 to R 12 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 to R 12 and R 1 ′ to R 8 ′ represents an alkyl group or an aryl group; and

k is an integer of 0 to 3, and when k is 0, a total of the carbon atoms of R 1 ′ to R 8 ′ is 2 or more.

19 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (1) is a compound represented by the following formula (2):

wherein R 21 to R 28 each independently represent a hydrogen atom, an alkyl group, or an aryl group; and

Cz 21 and Cz 22 each independently represent the following partial structure (Cz-2):

wherein R 29 to R 215 independently represents a hydrogen atom or an alkyl group; and

S 21 represents the group represented by the above (a), (b), (c), (d) or (e).

20 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (1) is a compound represented by the following formula (3):

wherein R 31 to R 38 each independently represent a hydrogen atom, an alkyl group, or an aryl group; and

Cz 31 and Cz 32 each independently represent the following partial structure (Cz-3):

wherein R 39 to R 315 each independently represent a hydrogen atom or an alkyl group; and

S 31 represents the group represented by the above (a), (b), (c), (d) or (e).

21 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-2):

wherein R 1 to R 11 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

B 1 represents a methyl group, an isobutyl group, or a neopentyl group; and

k is an integer of 1 to 3.

22 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-3):

wherein R 1 to R 11 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

B 1 represents a methyl group, an isobutyl group, or a neopentyl group; and

k is an integer of 1 to 3.

23 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-4):

wherein R 1 to R 11 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

B 1 represents a methyl group, an isobutyl group, or a neopentyl group; and

k is an integer of 1 to 3.

24 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-5):

wherein R 1 to R 12 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 to R 12 and R 1 ′ to R 8 ′ represents a methyl group, an isobutyl group, or a neopentyl group;

D 1 represents an electron-withdrawing group selected from a fluorine atom, a trifluoromethyl group and a cyano group, which is substituted for any of R 5 ′ to R 8 ′, and D 1 s may be the same with or different from every other D 1 ;

k represents an integer of 1 to 3; and

p represents an integer of 1 to 4.

25 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-6):

wherein R 1 ′ to R 7 ′ independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 ′ to R 7 ′ represents an alkyl group; and

B 1 represents a methyl group, an isobutyl group, or a neopentyl group.

26 . The organic electroluminescence device according to claim 18 ,

wherein the compound represented by formula (D-1) is a compound represented by the following formula (D-7):

wherein R 1 ′ to R 7 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 ′ to R 7 ′ represents an alkyl group; and

B 1 represents a methyl group, an isobutyl group, or a neopentyl group.

27 . The organic electroluminescence device according to claim 18 ,

wherein the light-emitting layer containing at least each of the compound represented by the above formula (1) and the compound represented by the above formula (D-1) is formed by a wet process.

28 . A composition comprising at least each of a compound represented by the following formula (1) and a compound represented by the following formula (D-1):

wherein R 11 to R 18 each independently represent a hydrogen atom, an alkyl group, or an aryl group; and

Cz 11 and Cz 12 each independently represent the following partial structure (Cz-1):

wherein R 19 to R 116 independently represent a hydrogen atom or an alkyl group;

S 11 represents the group represented by the following (a), (b), (c), (d) or (e), which is substituted for any one of R 19 to R 112 , and

n represents an integer of 0 or 1:

wherein R 1 to R 12 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 to R 12 and R 1 ′ to R 8 ′ represents an alkyl group or an aryl group; and

k is an integer of 0 to 3.

29 . A light-emitting layer containing at least each of a compound represented by the following formula (1) and a compound represented by the following formula (D-1):

wherein R 11 to R 18 each independently represent a hydrogen atom, an alkyl group, or an aryl group; and

Cz 11 and Cz 12 each independently represent the following partial structure (Cz-1):

wherein R 19 to R 116 independently represent a hydrogen atom or an alkyl group;

S 11 represents the group represented by the following (a), (b), (c), (d) or (e), which is substituted for any one of R 19 to R 112 , and

n represents an integer of 0 or 1:

wherein R 1 to R 12 each independently represent a hydrogen atom, an alkyl group, an aryl group, a fluorine group, or a cyano group;

R 1 ′ to R 8 ′ each independently represent a hydrogen atom, an alkyl group, a fluorine group, a trifluoromethyl group, or a cyano group;

at least one of R 1 to R 12 and R 1 ′ to R 8 ′ represents an alkyl group or an aryl group; and

k is an integer of 0 to 3.

30 . A light emission apparatus using the organic electroluminescence device according to claim 18 .

31 . A display apparatus using the organic electroluminescence device according to claim 18 .

32 . An illumination apparatus using the organic electroluminescence device according to claim 18 .