| http://www.w3.org/ns/prov#value | - The organic light emitting device of claim 1, wherein the device is a four-layer device comprising an electron-transporting layer comprising 2,3-di-pyridin-2-yl-dibenzoquinoxaline, an exciton blocking layer comprising 2,9-dimethyl-4,7-diphenyl-1,10-phenynanthroline, an emissive layer comprising a 4,4???-N,N???dicarbazole-biphenyl host material doped with fac tris(2-phenylpyridine iridium, and an N
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