Electroluminescent host material
View Patent ↗An OLED device comprises a cathode, an anode, and has therebetween a light-emitting layer containing a phosphorescent emitter and a host comprising a first aluminum or gallium complex containing at least one 2-(2-hydroxyphenyl)pyridine ligand and at least one phenoxy ligand, wherein the phenoxy ligand is substituted by an amine or there is further present adjacent to the light-emitting layer on the cathode side a layer containing a second aluminum or gallium complex containing at least one 2-(2-hydroxyphenyl)pyridine ligand and at least one phenoxy ligand.
1. An OLED device comprising a cathode, an anode, and having therebetween a light-emitting layer containing a phosphorescent emitter and a host comprising a first aluminum or gallium complex represented by Formula II:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fused rings;
n is independently 0 to 4; and
m is independently 0 to 5,
wherein there is further present adjacent to the light-emitting layer on the cathode side a layer containing a second aluminum or gallium complex containing at least one 2-(2-hydroxyphenyl)pyridine ligand and at least one phenoxy ligand.
2. An OLED device of claim 1 , wherein the first and second complexes are the same compound.
3. An OLED device of claim 1 , wherein the light-emitting layer contains an iridium-containing phosphorescent emitter.
4. An OLED device of claim 1 , wherein the second complex is represented by Formula I:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fined rings;
n is independently 0 to 4; and
m is 0 to 5.
5. An OLED device of claim 1 , wherein the second complex is represented by Formula III:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fused rings;
n is independently 0 to 4; and
m is 0 to 5.
6. An OLED device comprising a cathode, an anode, and having therebetween a light-emitting layer containing a phosphorescent emitter and a host comprising a first aluminum or gallium complex containing at least one 2-(2-hydroxyphenyl)pyridine ligand and at least one phenoxy ligand substituted with an amine.
7. An OLED device of claim 6 , wherein the light-emitting layer contains an iridium-containing phosphorescent emitter.
8. An OLED device of claim 6 , wherein the amine is selected from one comprising a pyridine, pyrrole, or indole group.
9. An OLED device of claim 6 , wherein the first complex is represented by Formula IV:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fused rings;
n is independently 0 to 4; and
m is independently 0 to 5.
10. An OLED device of claim 9 , wherein the first complex is represented by Formula II:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fused rings;
n is independently 0 to 4; and
m is independently 0 to 5.
11. An OLED device of claim 9 , wherein there is further present adjacent to the light-emitting layer on the cathode side a layer containing a second aluminum or gallium complex containing at least one 2-(2-hydroxyphenyl)pyridine ligand and at least one phenoxy ligand.
12. An OLED device of claim 11 , wherein the second complex is represented by Formula III:
wherein;
R 1 and R 2 are independently selected from alkyl, aryl, heteroaryl, halogen, aryl amine, alkyl amine, and cyano groups, provided that groups may join together to form fused rings;
n is independently 0 to 4; and
m is 0 to 5.
13. An OLED device of claim 6 wherein the first complex comprises at least one of the following:
14. An OLED device of claim 1 wherein the first complex comprises at least one of the following: