Synthesis, structure, and optoelectronic properties of a new twistacene 1,2,3,4,6,13-hexaphenyl-7 : 8,11 : 12-bisbenzo-pentacene

Abstract

We report the synthesis, optical and electrochemical properties, as well as the fabrication of

light-emitting devices for a new twistacene 1,2,3,4,6,13-hexaphenyl-7 : 8,11 : 12-bisbenzo-pentacene

(HBP 1). Its structure, determined by X-ray crystallography, confirmed that this material has a twisted

topology with the torsion angle as high as 23.0 ᵒ. HBP 1 showed bright green emission both in

solution and solid state. The HOMO–LUMO gap of HBP 1 calculated from the difference between the

half-wave redox potentials (E1/2

ox = +0.74 eV and E1/2

red = -1.93 eV) is 2.67 eV, which is in good

agreement with the band gap, 2.64 eV, derived from the UV-Vis absorption data. Organic light emitting

devices using HBP 1 as the emitters have been fabricated. The results revealed that twistacenes are

promising materials to enhance the efficiency of OLEDs.