Blue emitting of MEH PPV which is not identified with its inherent luminescence is reported in this paper.Using SiO 2 as accelerated layer,MEH PPV as emitting layer,we prepared organic/inorganic EL devices.While driven with alternative voltage,blue emitting (430 nm) is obtained.We consider the mechanism of blue emitting of MEH PPV is due to the direct impact of electrons which are accelerated by SiO 2.