Effect of hole transporting materials on the emission characteristics of soluble processed organic light-emitting devices on the plastic substrate

ABSTRACT

We have fabricated solution processed organic light-emitting devices (OLEDs) with various hole transporting materials (HTMs) on the plastic substrate. The device structure was ITO/HTM:Ir(2-phq)₃ 1wt%:FIrpic 5wt% (50 nm)/TAZ (50 nm)/LiF (0.5 nm)/Al (100 nm). 4,4′-bis(carbazol-9-yl)biphenyl (CBP), di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane (TAPC), poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)-benzidine] (poly-TPD), and poly(9-vinylcarbazole) (PVK) were used for HTM. Phosphorescent orange-red emitting Ir(2-phq)₃ and blue emitting FIrpic guest molecules were mixed with the HTMs and solvents. OLED with TAPC exhibited the maximum current efficiency of 17.4 cd/A at 0.42 mA/cm².

KEYWORDS:

• OLED
• flexible
• soluble
• PEN
• HTM

Funding

This work was supported by the Industrial Strategic Technology Development Program [10045269, Development of Soluble TFT and Pixel Formation Materials/Process Technologies for AMOLED TV] funded by MOTIE/KEIT and the Soonchunhyang University Research Fund.