Thienothiophene-based organic light-emitting diode: synthesis, photophysical properties and application

Abstract

A donor–π–acceptor (D–π–A)-type pull–push compound, DMB-TT-TPA (8), comprising triphenylamine as donor and dimesitylboron as acceptor linked through a thieno[3,2-b]thiophene (TT) π-conjugated linker bearing a 4-MeOPh group, was designed, synthesized, and fabricated as an emitter via a solution process for an organic light-emitting diode (OLED) application. DMB-TT-TPA (8) exhibited absorption and emission maxima of 411 and 520 nm, respectively, with a mega Stokes shift of 109 nm and fluorescence quantum yields both in the solid state (41%) and in solution (86%). The optical properties were supported by computational chemistry using density functional theory for optimized geometry and absorption. A solution-processed OLED was fabricated using low turn-on voltage, which had performances with maximum power, current, and external quantum efficiencies of 6.70 lm/W, 10.6 cd/A, and 4.61%, respectively.

High-Performance Thienothiophene and Single Wall Carbon Nanotube-Based Supercapacitor as a Free-Standing and Flexible Hybrid Energy Storage Material

“…Thieno­[3,2- b ]­thiophene (TT) has a rigid structure with extended π-conjugation, which makes it suitable π-linker for adjusting the band gap of organic materials and to increase the intermolecular interactions in solid state. − It is an electron-rich molecule, making it a promising material for the construction of conjugatedlow band gap polymeric semiconductors for energy-based applications such as organic solar cells, organic light-emitting diodes, and organic field-effect transistors. − In this report, we describe supercapacitor and energy storage performances of TT-TPA-SWCNT by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). For the first time, a high-performance free-standing and flexible electrode, based on a thienothiophene (TT) derivative and SWCNT, prepared without using any nonconductive binding agent, is reported.…”