Synthesis and electroluminescent properties of new phenothiazyl derivatives

Abstract

We report the synthesis of new conjugated compounds, 10,10′-Bis (4- tert-butyl-Phenyl)-10H, 10′H-[3,3′] biphenothiazinyl (t-BPBP), 10′-(4- tert-Butyl-Phenyl)-10′H [10, 3′; 7′10″] terphenothiazine (t-BPTP), 10,10′-Bis-(4- tert-Butyl-Phenyl)-7,7′ diphenothiazyl-10H, 10′H- [3,3′] biphenothiazinyl (t-BPDPBP). The obtained compounds were identified by 1H-NMR, IR and FAB-Mass spectroscopy. All the compounds exhibited high glass transition temperature ( T g) in the range of 118–161 °C. The glass transition and crystallization temperature of these materials appear to be rather high among commonly used hole injection material (m-MTDATA). Electro-optical properties were characterized by cyclic voltammetry and photoluminescence spectra. Organic Electro-Luminescence (EL) device with configuration of ITO/t-BPBP (60 nm)/NPB (15 nm)/Alq3 (70 nm)/LiF (1 nm)/Al (200 nm) exhibits a current efficiency 4.53 cd/A and power efficiency of 1.88 lm/W at 10 mA/cm 2 current density.