Polymers Containing Diphenylvinyl-Substituted Indole Rings as Charge-Transporting Materials for OLEDs

Novel Bipolar Indole-Based Solution-Processed Host Material for Efficient Green and Red Phosphorescent OLEDs

“…18 To further investigate the morphological stability of INDY, the atomic force microscopy (AFM) could be used to analyze the surface morphology of the film made by spin-coating of host solution on the hole-transport layer and annealing under different annealing temperatures (50, 90, and 145 °C) for 30 min in nitrogen atmosphere, as depicted in Figure 2b , which was lower than those of other indole-based derivatives with unsubstituted indole rings (E HOMO ∼ 5.9 eV). 27 And the lowest unoccupied molecular orbital energy level of −2.40 eV was obtained from onset reduction potential, which was consistent with the E LUMO (−2.25 eV) determined by the E HOMO and optical band gap. It is evident that the introduction of benzimidazole significantly affects the molecular orbitals (MOs) distribution.…”

“…S2). It can be seen from the Figure S2 that the onset oxidation and reduction potential of compound INDY are 1.25 V and −1.89 V. The highest occupied molecular orbital energy level was calculated as −5.69 eV for INDY by comparison to ferrocene (4.8 eV versus vacuum), which was lower than those of other indole-based derivatives with unsubstituted indole rings ( E HOMO ∼ 5.9 eV) . And the lowest unoccupied molecular orbital energy level of −2.40 eV was obtained from onset reduction potential, which was consistent with the E LUMO (−2.25 eV) determined by the E HOMO and optical band gap.…”

Synthesis, Thermal Properties, and Rheological Characteristics of Indole-Based Aromatic Polyesters

“…Surprisingly, little attention has been paid to the development of indole-based polyesters. In the literature, the use of indole structures has been limited to conducting polymers and microporous materials, − polymers with indole pendant groups, polyethersulfones, and poly­( N -arylene di­indolyl­methane)­s. − There was only one report in the 1980s describing bis-indole-containing polyesters without the characterization of properties . Recently, a new series of fully bio-based polyesters were synthesized and reported by our group using a new indole-based dicarboxylate monomer and five different aliphatic diols .…”