Organic electroluminescence device and compound for organic electroluminescence device
An organic electroluminescence device of an embodiment includes a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode, wherein the emission layer includes a compound represented by Formula 1, thereby showing excellent emission efficiency properties and long-life characteristics:
1. An organic electroluminescence device, comprising:
a first electrode;
a second electrode on the first electrode; and
an emission layer between the first electrode and the second electrode, the emission layer comprising a compound represented by Formula 1:
in Formula 1,
X 1 to X 4 are each independently CR a ,
L is a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring,
“n” is 1 or 2,
Ar is a substituted or unsubstituted aryl group of 6 to 15 carbon atoms for forming a ring, or represented by Formula 2:
in Formula 2,
Y is N or B,
Z is a direct linkage, O, S, NR d , or CR e R f ,
“b” and “c” are each independently an integer of 0 to 4, and
R b to R f 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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring, and
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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring.
2. The organic electroluminescence device of claim 1 , wherein L is a substituted or unsubstituted phenylene group, or a substituted or unsubstituted pyridylene group.
3. The organic electroluminescence device of claim 1 , wherein Formula 2 is represented by Formula 2-1 or Formula 2-2:
in Formula 2-1 and Formula 2-2, Z, R b , R c , “b”, and “c” are the same as defined in Formula 2.
4. The organic electroluminescence device of claim 3 , wherein Formula 2-2 is represented by any one selected from among Formula 2-2A to Formula 2-2E:
in Formula 2-2E,
“b1” is an integer of 0 to 3, “b2” is an integer of 0 to 4, and
R b1 and R b2 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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring, and
in Formula 2-2A to Formula 2-2E, R b , R c , “b”, and “c” are the same as defined in Formula 2.
5. The organic electroluminescence device of claim 1 , wherein the emission layer comprises a host and a dopant, and
the host comprises the compound.
6. The organic electroluminescence device of claim 1 , wherein the emission layer is to emit delayed fluorescence, and
the compound is a delayed fluorescence dopant.
7. The organic electroluminescence device of claim 1 , wherein the emission layer is to emit light having a central wavelength of about 500 nm to about 550 nm, or light having a central wavelength of about 420 nm to about 470 nm.
8. An organic electroluminescence device, comprising:
a first electrode;
a second electrode on the first electrode; and
an emission layer between the first electrode and the second electrode, wherein the emission layer comprises at least one selected from among compounds in Compound Group 1 as a light-emitting dopant:
9. A compound represented by Formula 1:
in Formula 1,
X 1 to X 4 are each independently CR a ,
L is a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring,
“n” is 1 or 2,
Ar is a substituted or unsubstituted aryl group of 6 to 15 carbon atoms for forming a ring, or represented by Formula 2:
in Formula 2,
Y is N or B,
Z is a direct linkage, O, S, NR d , or CR e R f ,
“b” and “c” are each independently an integer of 0 to 4, and
R b to R f 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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring, and
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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring.
10. The compound of claim 9 , wherein Formula 1 is represented by Formula 1-1:
in Formula 1-1, L, “n”, and Ar are the same as defined in Formula 1.
11. The compound of claim 9 , wherein Formula 2 is represented by Formula 2-1 or Formula 2-2:
in Formula 2-1 and Formula 2-2, Z, R b , R c , “b”, and “c” are the same as defined in Formula 2.
12. The compound of claim 11 , wherein Formula 2-2 is represented by any one selected from among Formula 2-2A to Formula 2-2E:
in Formula 2-2E,
“b1” is an integer of 0 to 3, “b2” is an integer of 0 to 4, and
R b1 and R b2 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 amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, and/or combined with an adjacent group to form a ring, and
in Formula 2-2A to Formula 2-2E, R b , R c , “b”, and “c” are the same as defined in Formula 2.
13. The compound of claim 9 , wherein the compound represented by Formula 1 is a green dopant to emit green light having a central wavelength of about 500 nm to about 550 nm.
14. The compound of claim 9 , wherein the compound represented by Formula 1 is a blue dopant to emit blue light having a central wavelength of about 420 nm to about 470 nm.
15. The compound of claim 9 , wherein the compound represented by Formula 1 has an absolute value (ΔE ST ) of a difference between a lowest excitation singlet energy level (S1) and a lowest excitation triplet energy level (T1) of about 0.2 eV or less.
16. The compound of claim 9 , wherein the compound represented by Formula 1 is represented by any one selected from among compounds in Compound Group 1: