| abstract |
A compound having a Pt tetradentate structure selected from the group consisting of n nis provided. In the structures of Formula 1 and Formula 2, rings C and D each independently represent 5- or 6-membered carbocyclic or heterocyclic ring; L 1 , L 2 , and L 3 are each independently a direct bond, BR, NR, PR, O, S, Se, C═O, S═O, SO 2 , SiRR′, GeRR′, alkyl, cycloalkyl, or a combination thereof; the sum of n1 and n2 is 1 or 2; X is selected from NR E , O, S, and Se; X 3 and X 4 each independently carbon or nitrogen; and one of Q 1 , Q 3 , and Q 4 is oxygen, and the remaining two of Q 1 , Q 3 , and Q 4 each represents a direct bond. Formulations and devices, such as an OLEDs, that include the compound of Formulas 1 and 2 are also described. |