Greatly improved performance for NLO chromophore with 4,4′-bis(diethylamino)benzophenone as donor by introducing stronger acceptor

One novel chromophore C based on 4,4′-bis(diethylamino) benzophenone donor and CF3-Ph-TCF acceptor was synthesized. Alkoxy isolation group was introduced also. Cyclic voltammetry measurements showed that the new chromophore C had a much smaller energy gap (ΔE = 1.25 eV) than chromophore A and B. UV-Vis absorption indicated that obvious red shift (more than 100 nm) obtained for chromophore C. The doped film C containing CF3-Ph-TCF chromophore showed a r33 value of 235 pm/V at the concentration of 25 wt% which is much higher than that of the TCF based chromophore A (149 pm/V) and B (163 pm/V). The thermal stability were high enough (>200 °C) to be further fabricated in devices and good EO property make application possible.