Electroluminescence device
An electroluminescence device of the present disclosure includes a first electrode, a second electrode facing the first electrode, and a plurality of organic layers between the first electrode and the second electrode, wherein at least one organic layer selected from among the plurality of organic layers includes a polycyclic compound represented by Formula 1, thereby showing improved emission efficiency:
1. An electroluminescence device, comprising:
a first electrode;
a second electrode facing the first electrode; and
a plurality of organic layers between the first electrode and the second electrode,
wherein at least one organic layer selected from among the plurality of organic layers comprises a polycyclic compound, and
the polycyclic compound comprises:
a substituted or unsubstituted fluorene group;
a substituted or unsubstituted phenyl group connected with a carbon atom at position 9 of the substituted or unsubstituted fluorene group;
a substituted or unsubstituted first carbazole group connected with the carbon atom at position 9 of the substituted or unsubstituted fluorene group; and
a substituted or unsubstituted second carbazole group connected with a nitrogen atom of the substituted or unsubstituted first carbazole group,
wherein the substituted first carbazole group is substituted with a substituted or unsubstituted fourth carbazole group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted dibenzothiophene group, or a biphenyl group.
2. The electroluminescence device of claim 1 , wherein the substituted or unsubstituted phenyl group is directly connected with the carbon atom at position 9 of the substituted or unsubstituted fluorene group.
3. The electroluminescence device of claim 1 , wherein the substituted or unsubstituted first carbazole group is directly connected with the carbon atom at position 9 of the substituted or unsubstituted fluorene group.
4. The electroluminescence device of claim 1 , wherein the substituted or unsubstituted second carbazole group is directly connected with the nitrogen atom of the substituted or unsubstituted first carbazole group.
5. The electroluminescence device of claim 1 , wherein a substituted or unsubstituted third carbazole group is connected with a nitrogen atom of the substituted or unsubstituted second carbazole group.
6. The electroluminescence device of claim 1 , wherein the substituted or unsubstituted phenyl group and the substituted or unsubstituted first carbazole group do not form a ring with each other.
7. The electroluminescence device of claim 1 , wherein the plurality of organic layers comprise a hole transport region, an emission layer, and an electron transport region, and
the polycyclic compound is in the emission layer.
8. The electroluminescence device of claim 7 , wherein the emission layer is to emit at least one of fluorescence, phosphorescence, or thermally activated delayed fluorescence.
9. The electroluminescence device of claim 7 , wherein the emission layer comprises a host and a dopant, and
the host comprises the polycyclic compound.
10. An electroluminescence device, comprising:
a first electrode;
a second electrode facing the first electrode; and
a plurality of organic layers between the first electrode and the second electrode, the plurality of organic layers comprising a hole transport region, an emission layer, and an electron transport region,
wherein the emission layer comprises a polycyclic compound, and
the polycyclic compound comprises:
a substituted or unsubstituted fluorene group;
a substituted or unsubstituted phenyl group connected with a carbon atom at position 9 of the substituted or unsubstituted fluorene group;
a substituted or unsubstituted first carbazole group connected with the carbon atom at position 9 of the substituted or unsubstituted fluorene group; and
a substituted or unsubstituted second carbazole group connected with a nitrogen atom of the substituted or unsubstituted first carbazole group, and
wherein the emission layer is to emit light having a central wavelength of about 420 nm to about 470 nm.
11. An electroluminescence device, comprising:
a first electrode;
a second electrode facing the first electrode; and
a plurality of organic layers between the first electrode and the second electrode,
wherein at least one organic layer selected from among the plurality of organic layers comprises a polycyclic compound represented by Formula 1:
and
in Formula 1,
R 1 to R 4 and R 6 to R 8 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 30 carbon atoms, a substituted or unsubstituted amine group, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
R 5 is a hydrogen atom, a deuterium atom, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted dibenzothiophene group, or a biphenyl group,
“a” and “b” are each independently an integer of 0 to 4,
“c” is an integer of 0 to 5,
“d” is an integer of 0 to 3,
“e” is an integer of 0 to 4,
“f” is an integer of 0 to 3, and
“g” is an integer of 0 to 4.
12. The electroluminescence device of claim 11 , wherein R 1 to R 4 , R 6 , and R 7 are each independently a hydrogen atom or a deuterium atom.
13. The electroluminescence device of claim 11 , wherein R 5 is a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuran group, or a substituted or unsubstituted dibenzothiophene group.
14. The electroluminescence device of claim 11 , wherein R 8 is a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms.
15. The electroluminescence device of claim 11 , wherein Formula 1 is represented by Formula 1-1:
and
in Formula 1-1,
X is NAr 1 , O or S,
Y 1 to Y 8 are each independently CR a or N,
Ar 1 is a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
R a is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 30 carbon atoms, a substituted or unsubstituted amine group, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, and
R 1 to R 7 , and “a” to “g” are the same as defined in Formula 1.
16. The electroluminescence device of claim 11 , wherein Formula 1 is represented by any one selected from among Formula 2-1 to Formula 2-3:
and
in Formula 2-1 to Formula 2-3,
Y 1 to Y 8 are each independently CR a or N,
Ar 1 is a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
R a is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 30 carbon atoms, a substituted or unsubstituted amine group, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, and
R 1 to R 7 , and “a” to “g” are the same as defined in Formula 1.
17. The electroluminescence device of claim 16 , wherein Ar 1 is a substituted or unsubstituted phenyl group.
18. The electroluminescence device of claim 11 , wherein Formula 1 is represented by Formula 3-1 or Formula 3-2:
and
in Formula 3-1 and Formula 3-2,
R 1 to R 8 , and “a” to “g” are the same as defined in Formula 1.
19. The electroluminescence device of claim 11 , wherein Formula 1 is represented by Formula 4-1:
and
in Formula 4-1,
R 1 to R 8 , “a” to “d”, and “f” to “g” are the same as defined in Formula 1.
20. The electroluminescence device of claim 11 , wherein the polycyclic compound represented by Formula 1 comprises at least one selected from among compounds represented in Compound Group 1: