Patent ID: 11925105
Assignee: UNIVERSAL DISPLAY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A compound having a fragment with at least five rings fused next to each other consecutively wherein the fragment is a ligand LA of Formula I;, , wherein:
rings A, B, C, D, and E are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
Z1-Z12 are each independently C or N;
RA, RB, RC, RD, and RE each independently represents zero, mono, or up to a maximum allowed substitutions to its associated ring;
if an RA, RB, RC, RD, or RE represents no substitution, then said RA, RB, RC, RD, or RE is hydrogen;
if RA, RB, RC, RD, or RE represents a substituent, then each RA, RB, RC, RD, and RE is independently a substituent selected from the group consisting of deuterium, halide, alkyl, cycloalkyl, fluorinated alkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
two substituents can be joined or fused together to form a ring;
wherein the ligand LA is complexed to a metal M at Z1 and Z6;
wherein the metal M is selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Pd, Au, Ag, and Cu;
wherein M can be coordinated to other ligands; and
wherein the ligand LA can be linked with other ligands to form a tridentate, tetradentate, pentadentate, or hexadentate ligand.