Synthesis and Luminescence Property of 4,4′-Bis(2,2-di(4-fluorophenyl)vinyl)biphenyl for Organic Blue-Light-Emitting Diodes

The novel fluorinated distyrylarylene, 4,4′-bis(2,2-di(4-fluorophenyl)vinyl)biphenyl (DFPVBi), was synthesized and fully characterized. The structure was confirmed with IR, ¹H NMR, ¹³C NMR, ¹⁹F NMR and MS analyses. Its electronic and photoluminescence properties were investigated by UV-Vis absorption, cyclic voltammetry and fluorescence spectroscopy. The energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) are −5.77 and −2.75 eV, respectively. The electroluminescence properties of the organic light-emitting diode fabricated by DFPVBi were also studied. The device exhibits a pure blue emission peaked at 454 nm, which indicates a maximum luminance of 5872 cd/m² at 14.2 V and a maximum current efficiency of 2.82 cd/A at 10V, respectively.