A new type of light-emitting naphtho[2,3-c][1,2,5]thiadiazole derivatives: synthesis, photophysical characterization and transporting properties†
Abstract
We report a new series of naphtho[2,3-c][1,2,5]thiadiazole (NTD) derivatives which present both carrier transporting property and high fluorescence quantum yield. Optical absorption and emission property, film morphology and thermal stability of these compounds have been investigated. Due to the absence of a strong donor group in the molecular structure, intermolecular dipole–dipole interaction and concentration quenching are effectively suppressed. The emission color was found to be adjustable depending on the aryl substituents at the 4,9-position of the NTD chromophore. Single crystals of 4-(2,2-diphenylvinyl)phenyl-substituted NTD (1) and biphenyl-substituted NTD (3) were obtained and determined by X-ray crystallography. It was found that 1, 3 and