| abstract |
In a particular embodiment, the present invention provides a boron-nitrogen heterocycle of formula (I): In certain embodiments, the present invention provides a device comprising a boron-nitrogen heterocycle, such as an organic light emitting device: <Formula I> In the above formula, one of E 1 and E 2 is N, and the other of E 1 and E 2 is B; E 3 and E 4 are carbon; Ring Y and ring Z are 5- or 6-membered carbocyclic or heterocyclic aromatic rings fused to ring X; R 2 and R 3 represent mono-, di-, tri- or tetra-substituted or unsubstituted; R 2 and R 3 are each independently selected from various substituents; Any two contiguous R 2 and R 3 are optionally joined to form a ring, which may be further substituted. |