ИСТИНА

Liquid organic luminophores are a relatively new and poorly studied class of materials which have high processability owing to their fluidic nature and efficient fluorescence in pristine state. Liquid organic luminophores are already used in various devices such as lasers [1], LEDs [2] and flexible displays based on them, sensors [3], etc. However, the structure-property relationships of such compounds remain poorly understood. In addition, they exhibit luminescence in a limited short-wavelength region of the spectrum. In the course of this work, new oligomers based on 2,2'-biphenyl-4,4'-diylthiophene with linear and branched alkyl, trialkylsilyl with different lengths and branching of alkyls and alkyloligodimethylsiloxane solubilizing groups were synthesized (see Fig. 1). The high purity and specified structure of all the compounds obtained was proved by a complex of modern research methods. The influence of the nature, length and branching of the solubilizing groups on the optical properties, rheology, phase behavior and thermal stability of luminophores has been studied. Based on this study, the most suitable group was selected to reduce aggregation in a condensed state, using which new liquid luminophores of oligomeric structure were obtained, emitting light in various ranges of the visible spectrum. This work was supported by the Russian Foundation for Basic Research (grant № 18-33-20224)