Organic electroluminescence device and display device including the same

1. An organic electroluminescence device comprising:

a first electrode;

a second electrode disposed on the first electrode; and

a first light emitting unit disposed between the first electrode and the second electrode, wherein the first light emitting unit includes:

a first hole transport region disposed on the first electrode;

a first light emitting layer disposed on the first hole transport region and including a host and a dopant; and

a first electron transport region disposed on the first light emitting layer and including a hole blocking layer and an electron transport layer disposed on the hole blocking layer, wherein the hole blocking layer, and at least one layer of the first light emitting layer or the electron transport layer include a polycyclic compound represented by Formula 1 below:

in Formula 1,

each of Y 1 to Y 5 and Y 11 to Y 15 is independently CH or N,

at least four of Y 1 to Y 5 are CH,

at least four of Y 11 to Y 15 are CH,

each of R 1 R 2 and R 3 is independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms, a substituted silyl group, a substituted boron group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 ring-forming carbon atoms, or forms a ring by being coupled to an adjacent group,

each of p and q is independently an integer of 1 to 5, and

r is an integer of 0 to 8.

2. The organic electroluminescence device of claim 1 , wherein the host comprises the polycyclic compound.

3. The organic electroluminescence device of claim 1 , wherein the hole blocking layer comprises only the polycyclic compound.

4. The organic electroluminescence device of claim 1 , wherein the first light emitting layer, the hole blocking layer, and the electron transport layer comprise the polycyclic compound.

5. The organic electroluminescence device of claim 1 , wherein the difference in HOMO energy level and the difference in LUMO energy level between the host and the polycyclic compound is each 0 eV to 0.1 eV.

6. The organic electroluminescence of claim 1 , wherein the hole mobility of the polycyclic compound is 0 cm 2 /Vs to 10′ cm 2 /Vs.

7. The organic electroluminescence device of claim 1 , wherein the lowest triplet energy level of the polycyclic compound is 1.6 eV to 1.8 eV, and the difference in the lowest triplet energy level between the host and the polycyclic compound is 0 eV to 0.2 eV.

8. The organic electroluminescence device of claim 1 , wherein at least one among R 1 to R 3 is a substituted or unsubstituted pyridine group, a substituted or unsubstituted bipyridine group, a substituted or unsubstituted pyrimidine group, a substituted or unsubstituted triazine group, a substituted or unsubstituted quinoline group, a substituted or unsubstituted quinazoline group, a substituted or unsubstituted quinoxaline group, a substituted or unsubstituted phthalazine group, a substituted or unsubstituted indole group, a substituted or unsubstituted pyrazine group, a substituted or unsubstituted pyridazine group, a substituted or unsubstituted thiophene group, a substituted or unsubstituted oxazole group, a substituted or unsubstituted thiazole group, or a substituted or unsubstituted pyrazole group.

9. The organic electroluminescence device of claim 1 , wherein the first light emitting layer emits light having a wavelength region of 440 nm to 490 nm.

10. The organic electroluminescence device of claim 1 , further comprising at least one light emitting unit disposed on the first light emitting unit,

wherein the at least one light emitting unit includes:

a second hole transport region disposed on the first light emitting unit;

a second light emitting layer disposed on the second hole transport region; and

a second electron transport region disposed between the second light emitting layer and the second electrode.

11. The organic electroluminescence device of claim 10 , wherein the first light emitting unit and the at least one light emitting unit emit blue light.

12. The organic electroluminescence device of claim 1 , wherein the polycyclic compound comprises at least one among the compounds represented by Compound group 1 below:

13. An organic electroluminescence device comprising:

a first electrode;

a hole transport region disposed on the first electrode;

a light emitting layer disposed on the hole transport region;

an electron transport region disposed on the light emitting layer and including a hole blocking layer and an electron transport layer disposed on the hole blocking layer; and

a second electrode disposed on the electron transport region,

wherein the hole blocking layer and the electron transport layer comprise a polycyclic compound represented by Formula 1 below:

in Formula 1, Y 1 to Y 5 and Y 11 to Y 15 are each independently CH or N,

at least four among Y 1 to Y 5 are CH,

at least four among Y 11 to Y 15 are CH,

each of R 1 , R 2 , and R 3 is independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms, a substituted silyl group, a substituted boron group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 ring-forming carbon atoms, or forms a ring by being coupled to an adjacent group,

each of p and q is independently an integer of 1 to 5, and

r is an integer of 0 to 8.

14. The organic electroluminescence display device of claim 13 , wherein the light emitting layer comprises a host and a dopant, and the difference in HOMO energy level and the difference in LUMO energy level between the host and the polycyclic compound is 0 eV to 0.1 eV.

15. The organic electroluminescence display device of claim 13 , wherein the hole blocking layer comprises only the polycyclic compound, and

the electron transport layer further comprises the polycyclic compound and at least one electron transport material.

16. A display device comprising a light emitting element layer including a plurality of organic electroluminescence devices,

wherein each of the organic electroluminescent devices comprises:

a first electrode;

a second electrode disposed on the first electrode;

a plurality of organic layers disposed between the first electrode and the second electrode, wherein the plurality of organic layers comprise:

a hole transport region disposed on the first electrode;

a first light emitting layer disposed on the hole transport region;

an electron transport region disposed on the first light emitting layer and including a hole blocking layer and an electron transport layer disposed on the hole blocking layer, wherein

the hole blocking layer and the electron transport layer comprise a polycyclic compound represented by Formula 1 below:

in Formula 1,

Y 1 to Y 5 and Y 11 to Y 15 are each independently CH or N,

at least four among Y 1 to Y 5 are CH,

at least four among Y11 to Y15 are CH,

each of R 1 R 2 , and R 3 is independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms, a substituted silyl group, a substituted boron group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 ring-forming carbon atoms, or forms a ring by being coupled to an adjacent group,

each of p and q is independently an integer of 1 to 5, and

r is an integer of 0 to 8.

17. The display device of claim 16 , wherein the organic layers further comprise at least one light emitting layer disposed between the electron transport region and the second electrode.

18. The display device of claim 16 , further comprising a light conversion layer disposed on the light emitting element layer,

wherein

the light emitting element layer emits blue light, and

the light conversion layer comprises:

a first light conversion part which absorbs the blue light and emits green light;

a second light conversion part which absorbs the blue light and emits red light; and

a third light conversion part which transmits the blue light.

19. The display device of claim 18 , wherein

the first light conversion part comprises a first quantum dot light emitting body which absorbs the blue light and emits red light,

the second light conversion part comprises a second quantum dot light emitting body which absorbs the blue light and emits red light, and

the third light conversion part comprises a base resin and a scattering body dispersed in the base resin.

20. The display device of claim 16 , wherein each of the hole transport region, the first light emitting layer, and the electron transport region is included as one layer in the light emitting element layer.