Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound having a structure of Formula I, ##STR00001## provided. In Formula I, each of R.sup.1 to R.sup.7 is hydrogen or phenyl or a system consisting of two to ten phenyl groups connected to each other; at least two of R.sup.1 to R.sup.7 are not hydrogen; each of R.sup.8 and R.sup.9 are phenyl or a system consisting of two to ten phenyl groups connected to each other; X is O, S, or Se; and L is a direct bond or ##STR00002## In the structure of L, m is an integer from 1 to 5, and R.sup.A is hydrogen, an aromatic or a heteroaromatic ring. Formulations, OLEDs, and consumer products containing the same are also provided.