2,2 ',7,7 '-Tetradiphenylamino-9,9 '-bifluorenylidene, TDPABF, was synthesized by reductive dimerization using Lawesson's reagent. It is soluble in common organic solvents such as dichloromethane, chloroform, and 1,2-dichlorobenzene. Its synthesis was confirmed by H-1-, C-13- NMR, MALDI-TOF, and FT-IR spectroscopy. Its HOMO and LUMO energy levels were -5.33eV and -2.98eV, respectively, using photoelectron spectroscopy and UV-Vis absorption spectra. Its fluorescence quenching properties were investigated through a Stern-Volmer quenching experiment. The PL intensity significantly decreased on increasing the concentration of TDPABF in a P3HT chloroform solution. The calculated Stern-Volmer quenching constant was 9.1 x 10(4) M-1, which is higher than that reported for PC61BM.