Synthesis and unitization of novel electroluminescent material monodisperse oligofluorenes

A series of novel electroluminescen material monodisperse oligofluorenes, were synthesized by modified Sonogashira reaction. The resulting oligomers were characterized by NMR, elemental analysis, DSC and MS. The products showed a strong PL emission and good solubility in common organic solvents. Light emitting diodes (LED) with the configuration ITO/NPB/OF/BCP/Alq/Mg : Ag were fabricated. The LED based on OF4R4 exhibited highly efficient and stable electroluminescence and reached its maximum of 5 795 cd/m2 at 20 V, on the other hand, the LED based on OF4R6 reached its external quantum efficiency of 1.0% at 11 V whereas the luminance was 511 cd/m2 and the maximum was 2690 cd/m2.EI0101900-19042