Organometallic compound, organic light emitting diode and organic light emitting device including the organometallic compound

1. An organometallic compound represented by Formula 1:

wherein each of X1 to X5 is independently N or CR4, and one of X1 to X5 is N,

wherein each of R1, R21, R22, R23, R31, R32, R33 and R34 is independently selected from the group consisting of deuterium (D), halogen atom, C1 to C10 alkyl group unsubstituted or substituted with D or halogen atom, C3 to C20 cycloalkyl group unsubstituted or substituted with D, C6 to C30 aryl group unsubstituted or substituted with D or C1 to C10 alkyl and C3 to C30 heteroaryl group unsubstituted or substituted with D or C1 to C10 alkyl,

wherein R4 is selected from the group consisting of hydrogen (H), D, halogen atom, C1 to C10 alkyl group unsubstituted or substituted with D, C3 to C20 cycloalkyl group unsubstituted or substituted with D, C6 to C30 aryl group unsubstituted or substituted with D or C1 to C10 alkyl and C3 to C30 heteroaryl group unsubstituted or substituted with D or C1 to C10 alkyl,

wherein each of R5, R6 and R7 is independently C1 to C10 alkyl group, and

wherein each of a to h is independently 0 or 1, and n is an integer of 0 to 2.

2. The organometallic compound according to claim 1 , wherein the Formula 1 is represented by Formula 2-1:

in Formula 2-1, the definitions of R1, R21, R31 to R34, R5 to R7, X1 to X5, a, e, f, g, h and n are the same as those in Formula 1.

3. The organometallic compound according to claim 2 , wherein the Formula 2-1 is represented by one of Formulas 2-2 to 2-3:

in Formulae 2-2 and 2-3, the definitions of R1, R21, R31, R32, R5 to R7, X1 to X5, a and n are the same as those in Formula 2-1.

4. The organometallic compound according to claim 1 , wherein n is 2.

5. An organic light emitting diode, comprising:

a first electrode;

a second electrode facing the first electrode; and

a first emitting unit positioned between the first and second electrodes and including a first emitting material layer,

wherein the first emitting material layer includes the organometallic compound according to claim 1 .

6. The organic light emitting diode according to claim 5 , wherein the first emitting material layer includes a first host and a first dopant, and the first dopant is the organometallic compound.

7. The organic light emitting diode according to claim 6 , further comprising:

a second emitting unit including a second emitting material layer and positioned between the first emitting unit and the first electrode; and

a first charge generation layer positioned between the first emitting unit and the second emitting unit,

wherein the second emitting material layer includes a blue dopant.

8. The organic light emitting diode according to claim 7 , wherein the first emitting unit further includes a third emitting material layer disposed under or on the first emitting material layer, and

wherein the third emitting material layer includes a red dopant.

9. The organic light emitting diode according to claim 7 , further comprising:

a third emitting unit positioned between the first emitting unit and the second electrode and including a third emitting material layer; and

a second charge generation layer positioned between the first emitting unit and the third emitting unit,

wherein the third emitting material layer includes a red dopant.

10. The organic light emitting diode according to claim 7 , further comprising:

a third emitting unit positioned between the first emitting unit and the second electrode and including a third emitting material layer; and

a second charge generation layer positioned between the first emitting unit and the third emitting unit,

wherein the first emitting unit further includes a fourth emitting material layer disposed under or on the first emitting material layer, and

wherein the third emitting material layer includes a blue dopant, and the fourth emitting material layer includes a red dopant.

11. An organic light emitting device, comprising:

a substrate; and

an organic light emitting diode disposed on the substrate, the organic light emitting diode including:

a first electrode,

a second electrode facing the first electrode, and

a first emitting unit positioned between the first and second electrodes and including a first emitting material layer,

wherein the first emitting material layer includes the organometallic compound according to claim 1 .

12. The organic light emitting device according to claim 11 , wherein the first emitting material layer includes a first host and a first dopant, and the first dopant is the organometallic compound.

13. The organic light emitting device according to claim 11 , wherein the organic light emitting diode further includes:

a second emitting unit including a second emitting material layer and positioned between the first emitting unit and the first electrode; and

a first charge generation layer positioned between the first emitting unit and the second emitting unit,

wherein the second emitting material layer includes a blue dopant.

14. The organic light emitting device according to claim 13 , wherein the first emitting unit further includes a third emitting material layer disposed under or on the first emitting material layer, and

wherein the third emitting material layer includes a red dopant.

15. The organic light emitting device according to claim 13 , wherein the organic light emitting diode further includes:

a third emitting unit positioned between the first emitting unit and the second electrode and including a third emitting material layer; and

a second charge generation layer positioned between the first emitting unit and the third emitting unit,

wherein the third emitting material layer includes a red dopant.

16. The organic light emitting device according to claim 13 , wherein the organic light emitting diode further includes:

a third emitting unit positioned between the first emitting unit and the second electrode and including a third emitting material layer; and

a second charge generation layer positioned between the first emitting unit and the third emitting unit,

wherein the first emitting unit further includes a fourth emitting material layer disposed under or on the first emitting material layer, and

wherein the third emitting material layer includes a blue dopant, and the fourth emitting material layer includes a red dopant.

17. The organic light emitting device according to claim 11 , wherein the substrate includes a red pixel region, a green pixel region and a blue pixel region, and the organic light emitting diode corresponds to each of the red, green and blue pixel regions, and

wherein the organic light emitting device further comprises:

a color filter layer corresponding to the red, green and blue pixel regions and disposed between the substrate and the organic light emitting diode or over the organic light emitting diode.

18. The organometallic compound according to claim 1 , wherein the organometallic compound is selected from compounds 211-270, 279-285, 311-315, 341-345 and 376-390:

19. An organometallic compound represented by Formula 2-2:

wherein each of X1 to X5 is independently N or CR4,

wherein each of R1, R21, and R31 is independently selected from the group consisting of C1 to C10 alkyl group unsubstituted or substituted with deuterium (D) or halogen atom and C3 to C20 cycloalkyl group unsubstituted or substituted with D,

wherein R4 is selected from the group consisting of hydrogen (H), D, halogen atom, C1 to C10 alkyl group unsubstituted or substituted with D, C3 to C20 cycloalkyl group unsubstituted or substituted with D, C6 to C30 aryl group unsubstituted or substituted with D or C1 to C10 alkyl and C3 to C30 heteroaryl group unsubstituted or substituted with D or C1 to C10 alkyl,

wherein each of R5, R6 and R7 is independently C1 to C10 alkyl group, and

wherein a is 1, and n is an integer of 0 to 2.

20. The organometallic compound according to claim 19 , wherein the organometallic compound is selected from compounds 392, 394, 396, 398, 400, 402 and 403: