Organic element for electroluminescent devices
View Patent ↗Disclosed is an electroluminescent device comprising a light-emitting layer containing a phosphorescent light emitting material that contains an organometallic complex comprising a metal selected from the group consisting of Ir, Rh, Os, Pt, and Pd and a pyrazole compound fused with at least one aromatic ring. The device provides useful light emissions.
1. An electroluminescent device comprising a light-emitting layer containing a phosphorescent light emitting material that contains an organometallic complex comprising a metal selected from the group consisting of Ir, Rh, Os, Pt, and Pd and a pyrazole compound fused with at least one aromatic ring.
2. The device of claim 1 wherein the metal is Ir.
3. The device of claim 1 wherein the pyrazole compound is further substituted with a substituent that has at least one double bond.
4. The device of claim 1 wherein the pyrazole compound is further substituted with a five or six-membered aromatic ring.
5. The device of claim 1 wherein the light emitting material is represented by Formula (1):
wherein:
Z represents the atoms necessary to form a pyrazole ring group that is fused to at least one aromatic ring group;
M is a coordinated metal selected from the group consisting of Ir, Rh, Pt, and Pd;
m is 1, 2 or 3 when M is Ir or Rh and m is 1 or 2 when M is Pt or Pd;
L represents an independently selected ligand group;
w is 0–4 as necessary in order to satisfy a 6 coordination sites when M is Ir, Rh, or Os, and w is 0–2 as necessary in order to satisfy 4 coordination sites when M is Pt or Pd; and
R 1 and R 2 represent substituent groups, provided that R 1 and R 2 may form a ring group.
6. The device of claim 5 wherein M is Ir.
7. The device of claim 6 wherein w is 0 and m is 3.
8. The device of claim 5 wherein R 1 and R 2 represent the atoms necessary to join to form a six-membered aromatic ring group.
9. The device of claim 6 wherein R 1 and R 2 represent the atoms necessary to join to form a six-membered aromatic ring group.
10. The device of claim 5 wherein the light-emitting material is represented by Formula (1a):
wherein:
M, L, w, m, R 1 , and R 2 are as defined in claim 5 ;
Ar represents the atoms necessary to form an aromatic ring group; and
R 3 represents hydrogen or a substituent group.
11. The device of claim 5 wherein the light-emitting material is represented by Formula (1b):
wherein:
M, L, w, m, R 1 , and R 2 are as defined in claim 5 ;
Ar represents the atoms necessary to form an aromatic ring group; and
R 4 represents H or a substituent group.
12. The device of claim 5 wherein the light-emitting layer contains a light emitting compound of Formula (1c),
wherein:
M, L, w, m, R 1 , R 2 are as defined in claim 5 ;
Ar represents the atoms necessary to form an aromatic ring group; and
R 3 represents H or a substituent group.
13. The device of claim 5 wherein the light-emitting material is represented by Formula (1d):
wherein:
Ar represents the atoms necessary to form an aromatic ring group;
R 3 is H or a substituent;
Ar 2 represents the atoms necessary to form a five or six membered aromatic ring group.
14. The device of claim 13 wherein Ar and Ar 2 independently represent the atoms necessary to form a benzene ring group and R 3 represents a six-membered aromatic ring group which may include additional fused rings.
15. The device of claim 5 wherein the light-emitting material is represented by Formula (1e)
wherein:
Ar represents the atoms necessary to form an aromatic ring group;
R 4 is H or a substituent;
Ar 2 represents the atoms necessary to form a five or six membered aromatic ring group.
16. The device of claim 15 wherein Ar and Ar 2 independently represent the atoms necessary to form a benzene ring group and R 4 represents a six-membered aromatic ring group which may include additional fused rings.
17. The device of claim 5 wherein the light-emitting material is represented by Formula (1f):
wherein:
Ar and Ar 2 independently represent the atoms necessary to form a benzene ring group and R 4 represents a six-membered aromatic ring group which may include additional fused rings.
18. The device of claim 17 wherein Ar and Ar 2 independently represent the atoms necessary to form a benzene ring group and R 3 represents a six-membered aromatic ring group which may include additional fused rings.
19. The device of claim 5 wherein the light-emitting layer contains a light emitting material of Formula (1a), (1b), or (1c),
wherein:
M is a coordinated metal selected from the group consisting of Ir, Rh, Pt, and Pd;
m is 1 or 3 when M is Ir or Rh and m is 1 or 2 when M is Pt or Pd;
L represents an independently selected ligand group;
w is 0–4 as necessary in order to satisfy a 6 coordination sites when M is Ir, Rh, or Os, and w is 0–2 as necessary in order to satisfy 4 coordination sites when M is Pt or Pd; and
R 1 and R 2 represent substituent groups, provided that R 1 and R 2 may form a ring group;
R 3 and R 4 independently represent H or a substituent; and
Ar represents the atoms necessary to form an aromatic ring group.
20. The device of claim 1 wherein the emitting material is a dopant compound disposed in a host material.
21. The device of claim 20 wherein the dopant compound is present in an amount of up to 15 wt % based on the host.
22. The device of claim 1 wherein the light-emitting material is part of a polymer.
23. The device of claim 1 including a means for emitting white light.
24. The device of claim 23 including a filtering means.
25. The device of claim 1 including a fluorescent emitting material.
26. A display comprising the device of claim 1 .
27. An area lighting device comprising the device of claim 1 .
28. A process for emitting light comprising applying a potential across the device of claim 1 .