Patent ID: 10121975

Abstract:
A compound comprising a ligand LA selected from: as well as, devices and formulations containing the compound are disclosed. In the compounds, independently X1-X6 are CH or N; Y1-Y12 are independently selected from CH, N, and C-APR1′R1″; when present, exactly one of Y1 through Y12 is C-APR1′R1″ in LA8; A is selected from a single bond, —CRARB—, —NRA—, —O—, —S— and —SiRARB—; and R, R1′, R1″, R2, R3, RA, and RB are each independently a substituent selected from hydrogen, deuterium, alkyl, cycloalkyl, aryl, and combinations thereof. The P-atom of the ligand LA is bonded to a metal M having an atomic weight of at least 40.