BODIPY associates in organic matrices: Spectral properties, photostability and evaluation as OLED emitters

作者：Merkushev D A; Usoltsev S D; Marfin Yu S^*; Pushkarev A P^*; Volyniuk D; Grazulevicius J V; Rumyantsev E V

来源：Materials Chemistry and Physics, 2017, 187: 104-111.

DOI：10.1016/j.matchemphys.2016.11.053

• BODIPY
• Fluorescent molecular rotor
• OLED
• Aggregation
• Dye doped polymer

In the present study four BODIPY (boron dipyrromethene: 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) dyes with pi-extended substituents in C-8 position were investigated in solvents and polymer mediums. High aggregation degree was observed for the dyes in the solid state. Association and twisted intramolecular charge transfer processes were found to affect the spectral properties of the compounds causing bathochromic shifts in absorption and fluorescence spectra. The extension of substituent pi conjugation gains molecular association evoked presumably by pi-pi interaction between the substituents of the adjacent molecules. Photostability of the complexes in different forms was analyzed and the distorted form stabilized by polymer matrix was found to be the most stable. The substituent nature did not affect strongly the photostability of dyes. Displacement of monomer-associate equilibrium in hybrid materials with polymethylmethacrylate and poly(9-vinylcarbazole) was exploited for tuning spectral characteristics of the materials. Two dyes readily forming aggregates at the lowest concentrations were applied for the fabrication of organic light-emitting diodes. The fabricated devices exhibited electroluminescence in the appropriate spectral ranges with moderate efficiency.

• 出版日期2017-2-1