Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound of Formula I ##STR00001## wherein L is a bidentate ligand coordinated to a metal M; each ring K is the same, and represents a 5-membered or 6-membered heteroaryl ring and with ring J forms a 5-member cyclometallated ring; A.sup.1 and A.sup.1' are the same and selected from CR.sup.1 or N; A.sup.2 and A.sup.2' are the same and selected from CR.sup.2 or N; A.sup.3 and A.sup.3' are the same and selected from CR.sup.3 or N; each R.sup.4 with its corresponding ring position R.sup.4' are the same, and R.sup.1 to R.sup.5 are as defined in the specification. An OLED with an organic layer that includes a compound of Formula I and a consumer product that includes the OLED. A method of making a compound of Formula I is also described.