Using Ta2O5 as electron acceleration layer,we fabricated an organic-inorganic heterostructure device with a structure of ITO/Ta2O5/MEH-PPV/Ta2O5/Al.The electroluminescence(EL),photoluminescence(PL),transient EL and the dependence of EL intensity on the applied voltage and current were studied.There also appears the cathodoluminescence(CL)-like emission,which means that the CL-like emission not only can be observed by using SiO2 as electron acceleration layer but also can be observed by using Ta2...