Organic electroluminescent device

1 . An organic electroluminescent device comprising a first electrode; a second electrode facing the first electrode; a light-emitting layer between the first electrode and the second electrode; and an electron buffer layer and an electron transport zone between the light-emitting layer and the second electrode, wherein the electron buffer layer comprises a compound represented by the following formula 1-3:

Wherein

R 1 to R 6 each independently represent hydrogen or deuterium;

L 1 represents a single bond, or a substituted or unsubstituted (C6-C30)arylene,

L 2 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

Ar 1 represents a substituted or unsubstituted (C6-C30)aryl;

Y represents O or S;

Ring C represents a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, or a substituted or unsubstituted phenanthrene ring;

L 9 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; and

R 9 represents a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl.

2 . An organic electroluminescent device comprising a first electrode; a second electrode facing the first electrode; a light-emitting layer between the first electrode and the second electrode; and an electron buffer layer and an electron transport zone between the light-emitting layer and the second electrode, wherein the electron buffer layer comprises a compound selected from the following compounds:

wherein

Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 or more.

3 . An organic electroluminescent device comprising a first electrode; a second electrode facing the first electrode; a light-emitting layer between the first electrode and the second electrode; and an electron buffer layer and an electron transport zone between the light-emitting layer and the second electrode, wherein the electron buffer layer comprises a compound represented by the following formula 1-1:

wherein

L 1 represents a single bond;

L 2 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

Ar 1 represents a substituted or unsubstituted (3- to 30-membered)heteroaryl; and

R 1 to R 8 each independently represent hydrogen or deuterium;

Ring A and Ring B each independently represent a substituted or unsubstituted benzene ring or a substituted or unsubstituted naphthalene ring; and

R 21 and R 22 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to the adjacent substituent to form a ring(s);

is selected from the following Group 1:

[Group 1]

wherein

R 23 to R 26 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C50)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to the adjacent substituent to form a ring(s);

a represents an integer of 1 to 3, b represents an integer of 1 to 4, c represents an integer of 1 to 5, and d represents an integer of 1 to 6; and

when a to d are an integer of 2 or more, each of R 23 to R 26 may be the same or different; wherein the light-emitting layer comprises a compound selected from the following compounds:

wherein

Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 or more.

4 . The organic electroluminescent device according to claim 3 , wherein the light-emitting layer further comprises a compound represented by the following formula 3:

wherein

Ring C, Ring D, and Ring E each independently represent a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 50-membered)heteroaryl; or Ring D and Ring E may be linked to each other to form a fused ring;

Y 1 represents B;

X 1 and X 2 each independently represent NR′, O, or S;

R′ represents hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted fused ring of (C3-C30) aliphatic ring and (C6-C30) aromatic ring, or -L 4 -N(Ar 13 )(Ar 14 ); or may be linked to at least one of Ring C, Ring D, and Ring E to form a ring;

L 4 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; and

Ar 13 and Ar 14 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl.

5 . The organic electroluminescent device according to claim 4 , wherein the compound represented by formula 3 is selected from the following compounds:

wherein

D2 to D5 represent that two to five hydrogens each have been replaced with deuterium.

6 . The organic electroluminescent device according to claim 1 , wherein the compound represented by formula 1-3 is selected from the following compounds:

7 . The organic electroluminescent device according to claim 1 , further comprising a hole transport zone between the first electrode and the light-emitting layer, and wherein the hole transport zone includes a hole injection layer and a hole transport layer.

8 . The organic electroluminescent device according to claim 1 , wherein the electron transport zone includes an electron transport layer and an electron injection layer.

9 . The organic electroluminescent device according to claim 1 , wherein the light-emitting layer comprises a compound represented by the following formula 2:

wherein

L 11 and L 12 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

Ar 11 and Ar 12 each independently represent a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and

R 11 to R 18 each independently represent hydrogen or deuterium;

provided that a compound represented by the following formula b is excluded from the formula 2