Abstract
We report a new electron transport material, 1,6-di(pyridin-3-yl)-3,8-di(phenyl)pyrene (PPP). It has a very good electron mobility of 4.1 × 10−3 cm2/Vs at the 0.1 MV/cm. This PPP is evaluated along with other electron transport materials such as Alq3 (tris-(8-hydroxyquinoline)aluminum) and Bphen (4,7-diphenyl-1,10-phenanthroline) in green phosphorescent organic light-emitting diodes. The maximum external quantum efficiency is increased by 43.5% compared with a reference Alq3 device. Operating voltage to reach 1000cd/m2 also is reduced to 1.2 V. Such high efficiency and low driving voltage are mainly attributed to the fast electron mobility and good LUMO (lowest unoccupied molecular orbital) level of the PPP material.
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