The Effect of Ketone Defects on the Charge Transport and Charge Recombination in Polyfluorenes

作者：Kuik Martijn^*; Wetzelaer Gert Jan A H; Ladde Jurre G; Nicolai Herman T; Wildeman Jurjen; Sweelssen Jorgen; Blom Paul W M

来源：Advanced Functional Materials, 2011, 21(23): 4502-4509.

DOI：10.1002/adfm.201100374

• organic light-emitting diodes
• organic electronics
• characterization tools
• conjugated polymers

The effect of on-chain ketone defects on the charge transport of the polyfluorene derivative poly(9,9-dioctylfluorene) (PFO) is investigated. Using MoO3 as ohmic hole contact, the hole transport in a pristine PFO diode is observed to be limited by space-charge, whereas fluorenone contaminated PFO (PFO-F) is shown to be trap limited by the occurrence of an exponential trap distribution with a trap depth of 0.18 eV. The electron transport in PFO is also observed to be trap limited, but in order to describe the electron transport of PFO-F, an additional trap level with a depth of 0.46 eV must be introduced. The obtained energy levels of the fluorenone trapping sites are in close agreement with cyclic voltammetry (CV) measurements reported in literature. As a result, the fluorenone defects are shown to simultaneously act as hole- and electron trap. Moreover, through ideality factor measurements, the green emission associated with these defects is observed to originate from trap-assisted recombination.

• 出版日期2011-12-6