New organic materials having polyaromatic structure containing boron and high triplet energy are disclosed. The high triplet energy materials are useful as host materials in PHOLEDs and improve device quantum efficiency and stability.
The present invention relates to quinobenzoxazines analogs having the general formula:
and pharmaceutically acceptable salts, esters and prodrugs thereof; wherein A, U, V, W, X and Z are substituents. The present invention also relates to methods for using such compounds.