The new blue light polymer, poly(1',4'-phenylene-1",4"-[2"-(2""-ethylhexy-loxy)]phenylene-1"',4"'-phenylene-2,5-oxadiazolyl) (PPEPPO) was synthesized through the Suzuki reaction of diboronic acid, 2-methoxy- [5-(2'-ethylhexyl)oxy] -1,4-benzene diboronic acid (MEHBBA) and dibromide, 2,5-bis(4'-bromophenyl)-1,3,4-oxadiazole This polymer was characterized with various spectroscopic methods. The solid PL spectrum of PPEPPO has a maximum peak at 444 nm corresponding to blue light. Blue LED has been fabricated using this polymer as the electroluminescent layer, ITO as the anode, and aluminum as cathode. This device emitted a blue light, with 40 V of turn-on voltage.