Organic light emitting device
The present invention provides an organic light emitting device having improved driving voltage, efficiency and lifetime.
1. An organic light emitting device, comprising:
a cathode;
an anode; and
at least one light emitting layer interposed between the cathode and the anode,
wherein the light emitting layer includes a first host compound of the following Chemical Formula 1-1 or Chemical Formula 1-2 and a second host compound of the following Chemical Formula 2:
wherein in Chemical Formulae 1-1 and 1-2:
Y is O or S;
X 1 to X 3 are each independently N, or CR 3 , and at least one of X 1 to X 3 is N;
L 1 is a single bond, a substituted or unsubstituted C 6-60 arylene, or a substituted or unsubstituted C 2-60 heteroarylene containing at least one of O, N, Si and S;
L 2 is a single bond;
Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6-60 aryl or a substituted or unsubstituted C 2-60 heteroaryl containing at least one of O, N, Si and S;
Ar 3 is any one selected from the group consisting of:
R 3 is hydrogen, deuterium, halogen, cyano, nitro, amino, a substituted or unsubstituted C 1-60 alkyl, a substituted or unsubstituted C 1-60 haloalkyl, a substituted or unsubstituted C 1-60 haloalkoxy, a substituted or unsubstituted C 3-60 cycloalkyl, a substituted or unsubstituted C 2-60 alkenyl, a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 1-60 heteroaryl containing at least one of O, N, Si and S;
wherein in Chemical Formula 2:
Y′ is O, S, or CR′R″;
R′ and R″ are each independently hydrogen, deuterium, halogen, cyano, nitro, amino, a substituted or unsubstituted C 1-60 alkyl, a substituted or unsubstituted C 1-60 haloalkyl, a substituted or unsubstituted C 1-60 haloalkoxy, a substituted or unsubstituted C 3-60 cycloalkyl, a substituted or unsubstituted C 2-60 alkenyl, a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 6-60 heteroaryl containing at least one of O, N, Si and S, or R′ and R″ together form a substituted or unsubstituted C 6-60 aromatic ring;
L′ is phenylene;
L″ is a single bond or phenylene;
R′ 1 is a substituted or unsubstituted C 1-60 alkyl, a substituted or unsubstituted C 3-60 cycloalkyl, a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one of O, N, Si and S;
R′ 2 and R′ 3 are each independently hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted C 1-60 alkyl, a substituted or unsubstituted C 3-60 cycloalkyl, a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one of O, N, Si and S; and
n and m are each independently an integer of 0 to 4.
2. The organic light emitting device of claim 1 , wherein the compound of Chemical Formula 2 is any one selected from the group consisting of:
3. The organic light emitting device of claim 1 ,
wherein X 1 to X 3 are each independently N or CH, provided that at least one of X 1 to X 3 is N.
4. The organic light emitting device of claim 1 ,
wherein L 1 is a single bond, phenylene, phenylene substituted with cyano, or pyridinylene substituted with phenyl.
5. The organic light emitting device of claim 1 ,
wherein Ar 1 and Ar 2 are each independently phenyl, phenyl substituted with cyano, phenyl substituted with one to five deuterium, biphenyl, or dibenzofuranyl.
6. The organic light emitting device of claim 1 , wherein the compound of Chemical Formulae 1-1 or 1-2 is any one selected from the group consisting of: