Universal Display Corporation

Jui-Yi Tsai

Mingjuan Su

Alan DeAngelis

Chuanjun Xia

Walter Yeager

Bin Ma

Lichang Zeng

A compound comprising a ligand L, having a structure of Formula I, is provided. In Formula I, Ato Aare each independently CR or N; at least two adjacent ones of Ato Aare CR and the Rs are joined together to form a six-membered ring fused to ring A or ring C; X is O, S, or Se; each R and Ris independently hydrogen or a substituent; any adjacent substituents are optionally joined or fused into a ring; the ligand Lis coordinated to a metal M; the metal M is bonded to ring A through a M-C bond; the metal M can be coordinated to other ligands; and the ligand Lis optionally linked with other ligands. Formulations, OLEDs, and consumer products containing such compounds are also disclosed.

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Ewing, NJ, United States of America

Jui-Yi Tsai