4-Azafluorenone and α-Carboline Fluorophores with Green and Violet/Blue Emission

Molecules. 2019 Jun 27;24(13):2378. doi: 10.3390/molecules24132378.


The emission properties of three 4-azafluorenone and five new α-carboline fluorophores in both solution and thin solid films were investigated. Fluorescence of the azafluorenone is clearly enhanced in thin solid films due to the presence of phenyl/biphenyl rotors, and these derivatives can be classified as green Aggregation-Induced Emission luminogens (AIEgens) with a non-emissive heteroaromatic core structure. Compared to azafluorenones, emission of α-carbolines is hypsochromically shifted to the blue region of the electromagnetic spectrum, and most of these derivatives exhibit strong violet-blue fluorescence in both solution and thin solid film layers. Further, the effective mobility and electroluminescence of new α-carbolines were investigated in prepared organic field-effect transistors and organic light-emitting diodes, respectively.

Keywords: 4-azafluorenone; aggregation-induced emission; fluorescence; organic thin films and thin film devices; α-carboline.

MeSH terms

  • Carbolines / chemical synthesis*
  • Carbolines / chemistry
  • Fluorenes / chemical synthesis*
  • Fluorenes / chemistry
  • Fluorescent Dyes / chemical synthesis*
  • Fluorescent Dyes / chemistry
  • Molecular Structure
  • Solutions


  • Carbolines
  • Fluorenes
  • Fluorescent Dyes
  • Solutions
  • azafluorenone
  • alpha-carboline