Selective Tuning of the HOMO–LUMO Gap of Carbazole‐Based Donor–Acceptor–Donor Compounds toward Different Emission Colors

Abstract

Carbazole‐based donor–acceptor compounds with tunable HOMO–LUMO gaps were synthesized by Suzuki and Sonogashira cross‐coupling reactions. Their optical and electrochemical properties were fully characterized. The results show that materials with different emission colors ranging from blue to green to orange could be obtained. The experimental results were also supported by theoretical calculations.

A carbon nanotube based resettable sensor for measuring free chlorine in drinking water

“…17,18 The HOMO/LUMO gap of organic molecules can also electrochemically measured by cyclic voltammetry. 19 The gap between the oxidation and reduction peak indicates the HOMO/LUMO gap. Cyclic voltammetry of PCAT/SWCNT shows that the HOMO/LUMO gap of the oxidized state was smaller than the reduced state (See supplementary material 22 ) which would result in a reduced resistance.…”

Combined experimental and theoretical study of one- and two-photon absorption properties of D–π–A–π–D type bis(carbazolylfluorenylethynyl) arene derivatives: Influence of aromatic acceptor bridge

“…The absorption features of CF4 and CF5 at wavelengths in thẽ 300e380 nm region show strong bands, which are assigned to the p / p* transition of fluorene, anthracene and benzothiadiazole moieties. Apart from the characteristic absorptions of the donors and acceptors, the solution spectra of CF4, and CF5 showed new broad bands at longer wavelengths~380e530 nm, which depend on their effective conjugation lengths [67]. This indeed indicates relatively smaller HOMOeLUMO gaps for CF4 and CF5 compared to CF1, CF2, and CF3.…”

“…1, Table 1). The band at about~290 nm for these compounds is assigned to a carbazole-centered transition [67]. The peaks at 300e450 nm in the case of CF1, CF2, CF3 with characteristic patterns are attributed to the p / p* transition of fluorene moiety, and also involve the acceptor (benzene, thiophene, fluorene).…”

Fluorescence and physical properties of the organic salt 2-chloro-4-nitrobenzoate–3-ammonium-phenol

“…To the best of our knowledge, the fluorescence properties of CNBA have not been investigated. HOMO-LUMO analysis can be used to study luminescence properties of molecules facilitating the design of materials for OLED applications [1][2][3][4][5][6][26][27][28]. Stable organic molecules with high electroluminescence efficiency have been very attractive for fabricating OLED materials [29].…”