Light emitting device
A light emitting device includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode, wherein the emission layer includes a first host represented by Formula 1, a second host different from the first host, and a dopant containing an organometallic complex, and thereby an improved service life characteristic may be exhibited:
1. A light emitting 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 first host represented by Formula 1, a second host different from the first host, and a dopant comprising an organometallic complex:
wherein, in Formula 1,
Ar 1 to Ar 3 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and
at least one among Ar 1 to Ar 3 is an aryl group having 6 to 30 ring-forming carbon atoms and comprising a halogen atom or a cyano group as a substituent, or is a hexagonal heterocycle comprising a nitrogen atom as a ring-forming atom, and
wherein the dopant is represented by Formula 3:
and
wherein, in Formula 3,
Q 1 to Q 4 are each independently C or N,
rings C1 to C4 are each independently a substituted or unsubstituted hydrocarbon ring having 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms,
Y is O or S,
d1 to d4 are each independently an integer of 0 to 4, and
R 31 to R 34 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 1 to 30 ring-forming carbon atoms, and/or are bonded to an adjacent group to form a ring.
2. The light emitting device of claim 1 , wherein at least one among Ar 1 to Ar 3 is represented by any one among EW-1 to EW-5:
and
wherein * indicates a point of connection.
3. The light emitting device of claim 1 , wherein the second host is represented by Formula 2:
wherein, in Formula 2,
X is NR a , O, or CR b R c ,
R 1 to R 8 , R a , R b , and R c are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 60 ring-forming carbon atoms, and
at least one of R a , R b , or R c is represented by Formula A:
and
wherein, in Formula A,
m is an integer of 0 to 2,
Ar 4 is a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 60 ring-forming carbon atoms, and
* indicates a point of connection.
4. The light emitting device of claim 1 , wherein Formula 3 is represented by Formula 3-1:
and
wherein, in Formula 3-1,
Q 11 , Q 31 , Q 32 , and Q 33 are each independently N, NR 11 , CR 12 , CR 12 R 13 , BR 14 , or BR 14 R 15 ,
R 11 to R 15 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 1 to 30 ring-forming carbon atoms, and/or are bonded to an adjacent group to form a ring, and
Y, ring C4, R 31 , R 32 , R 33 , d1, d2 and d4 are each independently the same as defined in Formula 3.
5. The light emitting device of claim 1 , wherein a weight ratio of the first host and the second host is about 3:7 to about 7:3.
6. The light emitting device of claim 1 , wherein the first host comprises at least one among compounds represented by Compound Group 1:
7. The light emitting device of claim 1 , wherein the second host comprises at least one among compounds represented by Compound Group 2:
8. The light emitting device of claim 1 , wherein the dopant comprises at least one among compounds represented by Compound Group 3:
9. The light emitting device of claim 1 , wherein the emission layer is to emit blue phosphorescence.
10. A light emitting device comprising:
a first electrode;
a second electrode on the first electrode;
an emission layer between the first electrode and the second electrode, the emission layer comprising a first host represented by Formula 1, a second host different from the first host, and a dopant comprising an organometallic complex; and
a capping layer on the second electrode, the capping layer having a refractive index of about 1.6 or more;
wherein, in Formula 1
Ar 1 to Ar 3 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and
at least one among Ar 1 to Ar 3 is an aryl group having 6 to 30 ring-forming carbon atoms and comprising a halogen atom or a cyano group as a substituent, or is a hexagonal heterocycle comprising a nitrogen atom as a ring-forming atom.
11. A light emitting 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 first host and a second host, which are different from each other, and a dopant comprising an organometallic complex,
wherein the first host comprises a triazine core and at least one electron-accepting substituent on the triazine core, and
the electron-accepting substituent is an aryl group substituted with a cyano group or a halogen atom, or is a hexagonal heterocycle comprising a nitrogen atom as a ring-forming atom, and
wherein the dopant is represented by Formula 3:
and
wherein, in Formula 3,
Q 1 to Q 4 are each independently C or N,
rings C1 to C4 are each independently a substituted or unsubstituted hydrocarbon ring having 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms,
Y is O or S,
d1 to d4 are each independently an integer of 0 to 4, and
R 31 to R 34 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 1 to 30 ring-forming carbon atoms, and/or are bonded to an adjacent group to form a ring.
12. The light emitting device of claim 11 , wherein the electron-accepting substituent is represented by any one among EW-1 to EW-5:
and
wherein * indicates a point of connection.
13. The light emitting device of claim 11 , wherein the first host is represented by Formula 1:
and
wherein, in Formula 1,
Ar 1 to Ar 3 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and
at least one among Ar 1 to Ar 3 is an aryl group having 6 to 30 ring-forming carbon atoms and comprising a halogen atom or a cyano group as a substituent, or is a hexagonal heterocycle comprising a nitrogen atom as a ring-forming atom.
14. The light emitting device of claim 11 , wherein the second host is represented by Formula 2:
wherein, in Formula 2,
X is NR a , O, or CR b R c ,
R 1 to R 8 , R a , R b , and R c are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 60 ring-forming carbon atoms, and
at least one of R a , R b , or R c is represented by Formula A:
and
wherein, in Formula A,
m is an integer of 0 to 2, and
Ar 4 is a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 60 ring-forming carbon atoms.
15. The light emitting device of claim 11 , wherein the first host comprises at least one among compounds represented by Compound Group 1:
16. The light emitting device of claim 11 , wherein the second host comprises at least one among compounds represented by Compound Group 2:
17. The light emitting device of claim 11 , wherein the dopant comprises at least one among compounds represented by Compound Group 3:
18. The light emitting device of claim 11 , wherein the emission layer is to emit blue phosphorescence.