New amorphous hole-transporting molecular materials: 1,1,1-Tris(4-(4-diarylaminobenzoyloxy)phenyl)ethane

Efficient new amorphous hole-transporting molecular materials (AHTMs) with high glass transition temperatures (Tg>117 °C). have been developed. AHTMs were easily prepared by condensation of 1,1,1-Tris(4-hydroxyphenyl)ethane (1) and triphenylamine derivatives using a condensing agent dicyclohexylcarbodiimide (DCC). The organic light-emitting device (OLED) prepared by using spin-cast films from the AHTMs onto the ITO-coated glass substrate in conjunction with Alq/Mg:Ag as a electron-transporting layer and a metal cathode, respectively, showed the maximum luminescence of 14,000 cd/m2 at 12 V.