UNDERSTANDING OPTICAL-EMISSIONS FROM ELECTRICALLY STRESSED INSULATINGPOLYMERS - ELECTROLUMINESCENCE IN POLY(ETHYLENE-TEREPHTHALATE) AND POLY(ETHYLENE 2,6-NAPHTHALATE) FILMS
D. Mary et al., UNDERSTANDING OPTICAL-EMISSIONS FROM ELECTRICALLY STRESSED INSULATINGPOLYMERS - ELECTROLUMINESCENCE IN POLY(ETHYLENE-TEREPHTHALATE) AND POLY(ETHYLENE 2,6-NAPHTHALATE) FILMS, Journal of physics. D, Applied physics, 30(2), 1997, pp. 171-184
Wear-out and breakdown of polymers used as insulating materials are cl
osely related to the dissipation of electrostatic energy in space char
ge regions. A fraction of this energy is radiated off by electrolumine
scence which can be considered as a pre-breakdown warning and provides
a probe to investigate the mechanisms leading to structural degradati
on. Electroluminescence emission from two aromatic polyesters is studi
ed-poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate). We
investigate the excitation processes of the luminescent centres, the
nature of the centres, and the relationship of the emission features t
o electrical ageing. Sample electroluminescence is excited by de and a
c voltages under a uniform field configuration. The discussion relies
on the analysis of the charge transport process in the luminescent reg
ime, the acquisition of electroluminescence and photoluminescence spec
tra, and the investigation of the field effect on photoluminescence.