A series of chrysene-based electron-transporters named BnPyPCs (n = 2, 3, 4) end-capped with two 3,5-di(pyridin-n-yl) phenyl moieties with high thermal and electrical stability were successfully developed. BnPyPCs showed T-m values greater than 390 degrees C and were used for highly efficient green phosphorescent OLEDs with maximum external quantum efficiency values greater than 20% and long operation lifetime at high brightness of approximately 11000 cd m(-2) at a current density of 25 mA cm(-2).