Phenyl and Fluorenyl Substituted Phenyl-Pyrazole Complexes of Ir
AssigneeUniversity of Southern California
InventorsMark E. Thompson, Arnold Tamayo, Peter Djurovich
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Abstract
The invention provides emissive materials and organic light emitting devices using the emissive materials in an emissive layer disposed between and electrically connected to an anode and a cathode. The emissive materials include compounds with the following structure: wherein at least one of R8 to R14 is phenyl or substituted phenyl, and/or at least two of R8 to R14 that are adjacent are part of a fluorenyl group. The emissive materials have enhanced electroluminescent efficiency and improved lifetime when incorporated into light emitting devices.
Claims23
A compound, having the structure:
- wherein
- M is a metal having an atomic weight greater than 40;
- (C—N) is a substituted or unsubstituted cyclometallated ligand;
- each of R8 through R14 is independently selected from hydrogen, alkyl, alkenyl, alkynyl, alkylaryl, CN, CF3, NO2, aryl, heteroaryl, substituted aryl, substituted heteroaryl, or a heterocyclic group;
- or
- any two adjacent substituted positions R8 through R14 can form a fused 4- to 7-member cyclic group, wherein said cyclic group is cycloalkyl, cycloheteroalkyl, aryl, or heteroaryl, and wherein the formed 4- to 7-member cyclic group is optionally substituted;
- and at least one of R8, R10, R12, R13, and R14, is selected from substituted or unsubstituted phenyl, substituted or unsubstituted napthyl, or substituted or unsubstituted pyridyl;
- n has a value of at least 1;
- and
- m+n is the maximum number of ligands that may be attached to the metal.
-18. (canceled)
(canceled)
Dependencies are inferred from the claim text.