Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A composition including a first compound capable of functioning as a phosphorescent emitter in an OLED is provided. The first compound has at least one aromatic ring and at least one substituent R directly bonded to one of the at least one aromatic rings. Each substituent R has the formula of ##STR00001## where (a) G.sup.1 is selected from NR.sup.1, SiR.sup.1R.sup.2, GeR.sup.1R.sup.2, alkyl, cycloalkyl, and combinations thereof; and G.sup.2 is a non-aromatic polycyclic group; (b) G.sup.1 is a direct bond; and G.sup.2 is a non-aromatic spiro polycyclic group; or (c) G.sup.1 is selected from direct bond, NR.sup.1, SiR.sup.1R.sup.2, GeR.sup.1R.sup.2, alkyl, cycloalkyl, and combinations thereof; G.sup.2 is a non-aromatic polycyclic group; and R is directly bonded to a phenyl, pyridine, or triazine. R.sup.1, R.sup.2, and R.sup.3 are a variety of substituents. Formulations and devices, such as an OLEDs, that include the first compound are also described.