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

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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.