Electroluminescence emission imaging in insulating polymers under uniform field configuration

Most of the reports on electroluminescence (EL) in insulating polymers deal with divergent field configuration which is well suited to correlate EL with material ageing. However, a deeper insight into excitation and relaxation mechanisms necessitate a more refined analysis which can only be done if more signal is collected. This can be achieved in EL experiments under uniform field configuration by using polymer films with semi-transparent metallic electrodes. In this work, we investigate two polymers, polyethylene (PE) and polyethylene naphthalate (PEN), belonging to two technically important families: polyolefins and aromatic polyesters.