345 / 2018-12-22 22:34:53

High Electric Field and Energetic Processes in Poly(ethylene naphthalate)

High field, electroluminescence, space charge, PEN

Poly(ethylene naphthalate) is a semi-crystalline
polymeric material having high field withstanding and strong
luminescence properties owing to its aromatic structure. Because
of these two features it is the insulating polymer having strongest
electroluminescence -EL yield investigated so far. EL is detected
in an electric field regime where strong non-linear conduction
properties have been identified. The light excitation mechanism,
though not completely elucidated could be charge recombination
with a contribution from impact excitation. It is believed that
copious space charges effects are at play in the field regime when
EL is detected. The EL spectrum shape evolves with field and
some of the bands were ascribed to electrical ageing of the
material. All of these features make of PEN a fascinating model
material for investigating fundamental processes at play under
high fields in insulating polymers.