Light emitting device
Provided is a light emitting device including a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode, and the emission layer may include a condensed cyclic compound represented by Formula 1 below, thereby exhibiting high luminous efficiency and improved service life characteristics.
1. A light emitting device comprising:
a first electrode;
a second electrode on the first electrode; and
an emission layer which is between the first electrode and the second electrode and comprises a condensed cyclic compound represented by Formula 1 below,
wherein the first electrode and the second electrode each independently comprises any one selected from among Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/AI, Mo, Ti, W, In, Sn, Zn, a compound of two or more thereof, a mixture of two or more thereof, and an oxide thereof:
wherein, in Formula 1,
X 1 to X 4 are each independently O, S, CR 5 R 6 , or NR 7 ,
m and n are each independently an integer of 0 to 3,
and p are each independently an integer of 0 to 4,
R 0 to R 7 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms, and
at least one selected from among R 1 to R 7 comprises a substituent represented by Formula 2 or Formula 3 below:
wherein, in Formula 2 and Formula 3,
Y 1 to Y 3 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted amine group, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms, and
R 8 to R 14 are independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or a unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbons atoms
“*”indicates a bonding point to another atom in the R 1 to R 7 group or the condensed cyclic compound represented by Formula 1.
2. The light emitting device of claim 1 , wherein Formula 1 above is represented by any one selected from among Formula 1-1 to Formula 1-6 below:
wherein, in Formula 1-1 to Formula 1-6 above,
R 71 to R 74 each independently correspond to R 7 defined in Formula 1 above, X 1 to X 4 , R 0 to R 4 , and m to p are the same as defined with respect to Formula 1.
3. The light emitting device of claim 1 , wherein at least two selected from among X 1 to X 4 are NR 7 , and the rest are each independently O, S, or CR 5 R 6 , and R 5 to R 7 are the same as defined with respect to Formula 1.
4. The light emitting device of claim 1 , wherein Formula 2 above is represented by Formula 2-1 below:
wherein, in Formula 2-1 above,
R Y1 is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and
R 8 to R 11 are the same as defined with respect to Formula 2.
5. The light emitting device of claim 1 , wherein Formula 3 is represented by Formula 3-1 below:
wherein, in Formula 3-1,
R Y2 and R Y3 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and
R 12 to R 14 are the same as defined with respect to Formula 3.
6. The light emitting device of claim 1 , wherein Y1 to Y3 are each independently an unsubstituted phenyl group, or a phenyl group substituted with an alkyl group having 1 to 10 carbon atoms.
7. The light emitting device of claim 1 , wherein at least one selected from among R 1 to R 7 comprises any one selected from among S-1 to S-3 below:
8. The light emitting device of claim 1 ,
wherein m and n are 1,
R 1 and R 2 are each independently NR a R b , and
at least one selected from among R a , R b , and R 7 is represented by Formula 2 or Formula 3, and the rest are substituted or unsubstituted aryl groups having 6 to 30 ring-forming carbon atoms.
9. The light emitting device of claim 1 , wherein m and n are 1, and
R 1 and R 2 are represented by any one selected from among AM-1 to AM-11 below:
10. The light emitting device of claim 1 , further comprising a capping layer on the second electrode, wherein the capping layer has a refractive index of about 1.6 or more.
11. The light emitting device of claim 1 , wherein the emission layer is a delayed fluorescence emission layer containing a host and a dopant, and
the dopant comprises the condensed cyclic compound.
12. The light emitting device of claim 1 , wherein the emission layer emits blue light having a center wavelength of about 450 nm to about 470 nm.
13. The light emitting device of claim 1 , wherein the emission layer comprises at least one selected from among the condensed cyclic compounds of Compound Group 1 below:
14. A light emitting device comprising:
a first electrode;
a second electrode on the first electrode;
an emission layer which is between the first electrode and the second electrode and comprises a condensed cyclic compound represented by Formula A below; and
a capping layer which is on the second electrode and has a refractive index of about 1.6 or more:
wherein, in Formula A above,
X 1 to X 4 are each independently O, S, CR 5 R 6 , or NR 7 ,
and p are each independently an integer of 0 to 4,
R a1 , R b1 , R a2 , and R b2 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms, or Rai and Rb1 are bonded to each other to form a ring, or R a2 and R b2 combine with each other to form a ring,
R 0 , and R 3 to R 7 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms, and
at least one selected from among R a1 , R b1 , R a2 , R b2 , and R 7 comprises a substituent represented by Formula 2 or Formula 3 below:
wherein, in Formula 2 and Formula 3,
Y 1 to Y 3 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted amine group, or a substituted or unsubstituted heterocycle having 2 to 30 ring-forming carbon atoms, and
R 8 to R 14 are independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or a unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbons atoms
“*”indicates a bonding point to another atom in the R a1 , R b1 , R a1 , R b2 or R 7 group or the condensed cyclic compound represented by Formula A.
15. The light emitting device of claim 14 , wherein Formula A is represented by any one selected from among Formula A-1 to Formula A-6 below:
wherein, in Formula A-1 to Formula A-6,
R 71 to R 74 each independently correspond to R7 defined in Formula A,
X 1 to X 4 , R 0 , R a1 , R b1 , R a2 , R b2 , R 3 , R 4 , o, and p are the same as defined with respect to Formula A.
16. The light emitting device of claim 14 , wherein at least two selected from among X 1 to X 4 are NR 7 , and the rest are each independently O, S, or CR 5 R 6 , and R 5 to R 7 are the same as defined with respect to Formula A.
17. The light emitting device of claim 14 , wherein Formula 2 is represented by Formula 2-1 below:
wherein, in Formula 2-1,
R Y1 is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and
R 8 to R 11 are the same as defined with respect to Formula 2.
18. The light emitting device of claim 14 , wherein Formula 3 is represented by Formula 3-1 below:
wherein, in Formula 3-1,
R Y2 and R Y3 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted silyl group, or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and
R 12 to R 14 are the same as defined with respect to Formula 3.
19. The light emitting device of claim 14 , wherein Y 1 to Y 3 are each independently an unsubstituted phenyl group, or a phenyl group substituted with an alkyl group having 1 to 10 carbon atoms.
20. The light emitting device of claim 14 , wherein the emission layer comprises at least one selected from among the condensed cyclic compounds of Compound Group 1 below: