Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

Compounds having a structure of Formula I, Formula II, or Formula III, devices containing the same, and formulations containing the same are described. ##STR00001## In Formulas (I), (II), and (III), X.sup.2 to X.sup.8 are C or N; at least one of X.sup.2 to X.sup.8 is N; R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently alkyl or cycloalkyl; at least one of R.sup.1 to R.sup.4 has at least two C atoms; R.sup.5 is hydrogen, deuterium, alkyl, cycloalkyl, or a combination thereof; R.sup.6, R.sup.7, and R.sup.8 are independently hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof; and n is 1 or 2.