Phosphine oxide-based compound and organic light-emitting device including the same

1. A phosphine oxide-based compound represented by Formula 1 below:

wherein Ar 1 to Ar 3 are each independently deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, or an N-containing electron withdrawing group;

a, b and c are each independently an integer from 0 to 5;

the sum of a, b, and c must be greater than or equal to 1; and

at least one of a number of Ar 1 s, b number of Ar 2 s, and c number of Ar 3 s is an N-containing electron withdrawing group,

wherein the N-containing electron withdrawing group is selected from among:

a substituted or unsubstituted pyrrolyl group,

a substituted or unsubstituted pyrazolyl group,

an unsubstituted imidazolyl group,

a substituted or unsubstituted imidazolinyl group,

a substituted or unsubstituted imidazopyridinyl group,

a substituted or unsubstituted imidazopyrimidinyl group,

a substituted or unsubstituted pyrazinyl group,

an unsubstituted pyrimidinyl group,

a substituted benzoimidazolyl group,

a substituted or unsubstituted indolyl group,

a substituted or unsubstituted purinyl group,

a substituted or unsubstituted quinolinyl group,

a substituted or unsubstituted isoquinolyl group,

a substituted or unsubstituted phthalazinyl group,

a substituted or unsubstituted indolizinyl group,

a substituted or unsubstituted naphthyridinyl group,

a substituted or unsubstituted quinazolinyl group,

a substituted or unsubstituted cinnolinyl group,

a substituted or unsubstituted indazolyl group,

a substituted or unsubstituted isothiazolyl group,

a substituted or unsubstituted isoxazolyl group,

a substituted or unsubstituted triazinyl group,

a substituted or unsubstituted oxadiazolyl group,

a substituted or unsubstituted pyridazinyl group,

a substituted or unsubstituted triazolyl group,

a substituted or unsubstituted tetrazolyl group,

a substituted or unsubstituted benzothiazolyl group, and

a substituted or unsubstituted benzoxazolyl group.

2. The phosphine oxide-based compound of claim 1 , wherein the N-containing electron withdrawing group is selected from among:

an unsubstituted pyrimidinyl group,

a substituted or unsubstituted pyrazinyl group,

a substituted or unsubstituted triazinyl group,

a substituted or unsubstituted quinolinyl group,

a substituted or unsubstituted isoquinolinyl group,

a substituted benzoimidazolyl group,

a substituted or unsubstituted imidazopyridinyl group,

a substituted or unsubstituted imidazopyrimidinyl group,

a substituted or unsubstituted benzothiazolyl group, and

a substituted or unsubstituted benzoxazolyl group.

3. The phosphine oxide-based compound of claim 1 , wherein the N-containing electron withdrawing group is represented by one of Formulae 2C to 2L:

wherein Z 1 and Z 2 are each independently selected from deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group and a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 3 -C 10 cycloalkenyl group and a C 6 -C 60 aryl group; a C 6 -C 60 aryl group substituted with at least one of —F, —CN, and a C 1 -C 10 alkyl group; and a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group and a C 2 -C 60 heteroaryl group;

c 1 is an integer from 0 to 4;

c 2 is an integer of 0 to 3;

c 3 is an integer from 0 to 2;

c 4 is an integer of 0 to 6;

c 5 is an integer from 0 to 5; and

T 1 is O or S.

4. The phosphine oxide-based compound of claim 3 , wherein the Z 1 and Z 2 are each independently deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxylic group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, an anthryl group, or a phenanthrenyl group.

5. The phosphine oxide-based compound of claim 2 , wherein the N-containing electron withdrawing group is represented by Formula 2I below:

wherein Z 1 is a phenyl group, a naphthyl group, an anthryl group, or a phenanthrenyl group, and Z 2 is independently selected from deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group and a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 3 -C 10 cycloalkenyl group and a C 6 -C 60 aryl group; a C 6 -C 60 aryl group substituted with at least one of —F, —CN, and a C 1 -C 10 alkyl group; and a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group and a C 2 -C 60 heteroaryl group; and

c 1 is an integer from 0 to 4.

6. The phosphine oxide-based compound of claim 1 , wherein at least two of the a number of Ar 1 s, the b number of Ar 2 s, and the c number of Ar 3 s are N-containing electron withdrawing groups.

7. The phosphine oxide-based compound of claim 1 , wherein a, b, and c are all 1, and at least two of Ar 1 , Ar 2 , and Ar 3 are N-containing electron withdrawing groups.

8. The phosphine oxide-based compound of claim 1 , wherein the phosphine oxide-based compound is a compound represented by Formula 1A below:

wherein Ar 1 to Ar 3 are each independently deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, or an N-containing electron withdrawing group; and

at least one of Ar 1 , Ar 2 , and Ar 3 is an N-containing electron withdrawing group,

wherein the N-containing electron withdrawing group is selected from among one of Formulae 2C to 2L:

wherein Z 1 and Z 2 are each independently selected from deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group and a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 3 -C 10 cycloalkenyl group and a C 6 -C 60 aryl group; a C 6 -C 60 aryl group substituted with at least one of —F, —CN, and a C 1 -C 10 alkyl group; and a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group and a C 2 -C 60 heteroaryl group;

c 1 is an integer from 0 to 4;

c 2 is an integer of 0 to 3;

c 3 is an integer from 0 to 2;

c 4 is an integer of 0 to 6;

c 5 is an integer from 0 to 5; and

T 1 is O or S.

9. The phosphine oxide-based compound of claim 8 , wherein Z 1 and Z 2 are each independently deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group and a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, an anthryl group, or a phenanthrenyl group.

10. The phosphine oxide-based compound of claim 8 , wherein at least two of Ar 1 , Ar 2 , and Ar 3 are N-containing electron withdrawing groups.

11. The phosphine oxide-based compound of claim 8 , wherein the phosphine oxide-based compound is a compound represented by Formula 1A-(1):

wherein Ar 1 , Ar 2 , and Ar 3 are each independently selected from among deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxyl group and a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, an anthryl group, a phenanthrenyl group, and groups represented by Formulae 2A to 2M, wherein at least one of Ar 2 , Ar 2 , and Ar 3 is selected from among groups represented by Formulae 2C to 2M:

wherein Z 1 and Z 2 are each independently deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, hydrazine, hydrazone, a carboxylic group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, an anthryl group, or a phenanthrenyl group;

c 1 is an integer from 0 to 4;

c 2 is an integer of 0 to 3;

c 3 is an integer from 0 to 2;

c 4 is an integer of 0 to 6;

c 5 is an integer from 0 to 5; and

T 1 is O or S.

12. The phosphine oxide-based compound of claim 1 , wherein the phosphine oxide-based compound is one of Compounds 1 to 6 below:

13. The phosphine oxide-based compound of claim 1 , wherein the phosphine oxide-based compound has a highest occupied molecular orbital (HOMO) energy level of about −7.0 eV or less.

14. An organic light-emitting device comprising:

a first electrode;

a second electrode disposed opposite to the first electrode; and

an organic layer disposed between the first electrode and the second electrode and comprising an emission layer,

wherein the organic layer comprises at least one of the phosphine oxide-based compounds of claim 1 .

15. The organic light-emitting device of claim 14 , wherein the organic layer further comprises at least one of a hole injection layer, a hole transport layer, a functional layer having both hole injection and hole transport capabilities, a buffer layer, and an electron blocking layer between the first electrode and the emission layer.

16. The organic light-emitting device of claim 14 , wherein the organic layer further comprises at least one of a hole blocking layer, an electron transport layer, a functional layer having both electron injection and electron transport capabilities and an electron injection layer between the emission layer and the second electrode.

17. The organic light-emitting device of claim 16 , wherein the organic layer further comprises an electron transport layer between the emission layer and the second electrode, and the electron transport layer comprises at least one of the phosphine oxide-based compounds.

18. The organic light-emitting device of claim 17 , wherein the electron transport layer further comprises a lithium (Li) complex.

19. The organic light-emitting device of claim 16 , wherein the organic layer further comprises a hole blocking layer and an electron transport layer between the emission layer and the second electrode, and the hole blocking layer comprises at least one of the phosphine oxide-based compounds.

20. The organic light-emitting device of claim 14 , wherein the emission layer comprises a host and a dopant, and the dopant is a phosphorescent dopant emitting light based on the mechanism of phosphorescence.