Fecha de publicación: 01/12/2022
Fuente: Wipo Milk or dairy products
A compound comprising a first ligand LA, where LA comprises a structure of Formula I,

is provided. In Formula I, each of X1, X2, X3, and X4 represents CR, CRR′, NR, or N; Y is selected from a linking group; each of R, R′, R″, R1, R1′, R2, R2′, R3, R3′, R4, and R4′ is hydrogen or a substituent; each represents a single bond or a double bond; any two adjacent substituents may be joined or fused to form a ring; two adjacent ones of R1, R2, R3, and R4 are joined together to form a fused 5-membered heterocyclic ring, Ring A, while the remaining two of R1, R2, R3, and R4 cannot be joined to form an aromatic ring; and Ring A is joined to a metal M by a direct bond. Formulations, OLEDs, and consumer products comprising the compound are also provided.