7,8,10-triphenylfluoranthene [TPF], 7,10-diphenyl-8-(1-naphthyl) fluoranthene[DPNF], 7,10-diphenyl-8-(9-phenanthrenyl)fluoranthene[DPPF] were synthesized by using the Knoevenagel condensation and Diels-Alder addition. PL maximum values of TPF, DPNF and DPPF are 458 nm, 460 nm and 461 nm, respectively. TPF showed sky-blue CIE value of (0.192, 0.269) and 3.27 cd/A at 10 mA/cm(2). DPNF also showed sky-blue CIE value of (0.189, 0.262) and 3.24 cd/A at 10 mA/cm(2). DPPF showed much better operating voltage, luminance and power efficiency of 3.96cd/A and 2.11 lm/W although it had worse C.I.E. value than TPF.