Photophysical and Electrochemical Properties of Highly π-Conjugated Bipolar Carbazole-1,3,4-Oxadiazole-based D-π-A Type of Efficient Deep Blue Fluorescent Dye

Multicomponent synthesis of pyrrolo[2,1-a]isoindolylidene-malononitrile (PIYM) fluorophores and their photophysical properties

“…The HOMO energy levels are calculated from the oxidation potentials calibrated against the Fc/Fc + redox couple using the empirical relation E HOMO = –[ E ox + 4.44] eV (Table 4). 59 All R 1 -substituted PIYM fluorophores exhibited irreversible oxidation waves, similar to 5a (Fig. S7†).…”

“…7). The HOMO was estimated to be −5.66 eV from the E ox (oxidation peak potential), and the LUMO from E HOMO + E g(opt) 59 was estimated to be −2.46 eV (Table 2).…”

An efficient solution-processable non-doped hybridized local and charge-transfer (HLCT) emitter for a simplified organic light-emitting diode

“…1, and the data are presented in Table 1. The UV-vis absorption spectrum in toluene exhibited three distinct absorption bands at 298 nm attributed to the characteristic π–π* transition of the electron-rich carbazole, 45 321 nm assigned to π–π* electronic transitions of the aromatic conjugated backbone, and 419 nm ascribed to the intramolecular charge transfer (ICT) transition from the electron-donating (D) carbazole to the electron-accepting (A) Bz unit of the HLCT part in the molecule. In the solution, CPBzFC showed an intense green fluorescence with an emission peak at 569 nm (Fig.…”

Benzothiadiazole-based fluorophores as efficient non-doped emitters for solution-processed organic light-emitting diodes

“…1, and the data are listed in Table 1. The UV-Vis absorption spectrum in toluene showed three distinct absorption bands at 300 nm (log ε = ∼5.1 M −1 cm −1 ) attributed to the characteristic π–π* transition of the electron-rich carbazole, 44 ∼340 nm (log ε = 4.93–5.02 M −1 cm −1 ) assigned to π–π* electronic transitions of the aromatic conjugated backbone, and the broadened absorptive band around 417–425 nm (log ε = 4.69–4.77 M −1 cm −1 ) ascribed to the intramolecular charge transfer (ICT) transition from the electron-donating (D) carbazole/triphenylamine to electron-accepting (A) benzothiadiazole (Bz) unit of the HLCT fragment in the molecules. The ICT absorption band of CPBFTPA was slightly red-shifted with a marginally higher ε value than CPBFPhC , suggesting that the former possesses a relatively enhanced push–pull effect or ICT interaction induced between D and A units.…”

“…1, and the data are listed in Table 1. The UV-Vis absorption spectrum in toluene showed three distinct absorption bands at 300 nm (log e = B5.1 M À1 cm À1 ) attributed to the characteristic p-p* transition of the electron-rich carbazole, 44 triphenylamine to electron-accepting (A) benzothiadiazole (Bz) unit of the HLCT fragment in the molecules. The ICT absorption band of CPBFTPA was slightly red-shifted with a marginally higher e value than CPBFPhC, suggesting that the former possesses a relatively enhanced push-pull effect or ICT interaction induced between D and A units.…”