or dual emission devices the substrate 12 can be a glass plastic or semiconductor substrate suitable material for the bottom and top electrodes can be ca ag mg al li in au ni w pt cu indium tin oxide ito indium zinc oxide izo aluminum zinc oxide azo or zinc oxide zno formed by sputtering electron beam evaporation thermal evaporation or chemical vapor deposition further al least one of the bottom and top electrodes 14 and 18 is transparent the electroluminescent element 16 at least includes an emission layer and can further include a hole injection layer a hole transport layer an electron transport layer and an electron injection layer in embodiment of the invention at least one layer of the electroluminescent element 16 includes the aforementioned organic compound according to an embodiment of the invention the organic electroluminescent device can be a phosphorescent organic electroluminescent device and the phosphorescent organic electroluminescent device can include an emission layer including a host material and a phosphorescent dopant wherein the host material includes the aforementioned organic compounds in order to clearly disclose the organic electroluminescent devices of the invention the following examples using dat and tbp as host materials and blue or green phosphorescent dopant and comparative examples are.