Pentacene moiety in electro-optical device which includes solar cell and organic light-emitting diodes (OLEDs) has attracted lots of interest because of its high carrier mobility and dopant property. We synthesized new conjugated compounds, 6,13-diphenylpentacene(DPP), 6,13-dinaphthalen-1-yl-pentacene(DNP) and 6,13-di-naphthalen-2-yl-pentacene(2-DNP) based on pentacene by using of tin(II) chloride dihydrate catalyst. All compounds showed photoluminescent (PL) maximum wavelength at around 620 nm and 660 nm. As solute concentration of DPP increases, the PL peak intensity at 660 nm rapidly increases as well as the overall PL intensity normally increases. This experimental result was only observed in 1-DNP, on the other hand, this tendency was not found in 2-DNP. We suppose the result can be explained by steric interaction between naphthyl moieties.