Synthesis and Hole-Injection Property of Phenothiazinyl Derivative Containing Triphenylamine Moiety in OLED Device

Abstract

We report the synthesis of a new conjugated compounds, tris-{4-[10-(4-tert-butylphenyl)-10H-phenothiazin-3-yl]phenyl}amine[TPPPA]. TPPPA showed UV-visible absorption maximum value of 352 nm and photoluminescence (PL) maximum value of 455 nm. It was found that TPPPA could be applied to HIL material by HOMO level calculation from cyclic voltammetry data. Organic light-emitting diodes (OLEDs) device with configuration of ITO/TPPPA(60 nm)/NPB(15 nm)/Alq₃ (70 nm)/LiF(1 nm)/Al(200 nm) exhibited a current efficiency 2.85cd/A and power efficiency of 1.18 lm/W at 10 mA/cm² current density.

Keywords:

• electroluminescent
• Hole Injection Layer (HIL)
• OLEDs
• phenothiazine
• Star-burst

Acknowledgments

This Study was supported by the department specialization Fund, 2007 of Catholic University of Korea. This work was supported by grant No. R01-2006-00010196-0 from the Basic Research Program of the Korea Science & Engineering Foundation.