A compound having the formula Ir(L
A
)
n
(L
B
)
3-n
, having the structure
of Formula I is provided. In the structure of Formula I, each of A
1
through A
8
is independently carbon or nitrogen; at least one of A
1
through A
8
is nitrogen; ring B is bonded to ring A through a C—C bond; the iridium is bonded to ring A through an Ir—C bond; X is O, S, or Se; each of R
1
through R
5
are independently selected from a variety of substituents, which may be linked for form a ring; n is an integer from 1 to 3; and at least one R
2
adjacent to ring C is not hydrogen. Formulations and devices, such as OLEDs, that include the first compound are also provided.
提供具有Ir(
LA)n(LB)3-n分子式的化合物,其具有结构式I。在结构式I中,A1到A8中的每一个都是独立的碳或氮;至少有一个是氮;环B通过一个C—C键与环A相连;
铱通过Ir—C键与环A相连;X为O、S或Se;R1到R5中的每一个都可以从各种取代基中独立选择,这些取代基可以连接形成一个环;n是从1到3的整数;并且至少有一个邻接环C的R2不是氢。还提供了包括第一化合物的配方和器件,如OLEDs。