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

Claim 9:
10. A compound having a fragment with at least five rings fused next to each other consecutively wherein the fragment is a ligand LA having a formula selected from the group consisting of:, wherein each X1-X2 is independently selected from the group consisting of C and N; wherein no more than two N atoms are bonded to one another;
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;
wherein each Y1-Y5 is selected from the group consisting of O, S, Se, NR, CRR′, SiRR′, GeRR′, and BR; and wherein R and R′ are independently selected from the group consisting of hydrogen, deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, and combinations thereof;
two substituents can be joined or fused together to form a ring;
wherein the dashed lines represent coordination to a metal M;
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.