has been constructed from an emissive layer of doped 9,10-bis-(beta-naphthyl)-anthrene, a hole-blocking/electron transport layer for carrier and exciton confinement, and a MgAg cathode with a thin LiF film on top to further decrease the driving voltage. (L.-S. Hung et al., September 16, Adv. Mater. 2002, 14, 1317-1321)