High Mobility Electron Transport Material with Pyrene Moiety for Organic Light-Emitting Diodes (OLEDs)

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.

Keywords:

• organic light emitting diode
• electron transport materials
• pyrene
• mobility
• phosphorescent

Acknowledgment

This work was supported by the IT R&D program of MKE/KEIT [2009-F-016-01, Development of Eco-Emotional OLED Flat-Panel Lighting].