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Electroluminescence in insulating polymers in ac electric fields

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7 Author(s)
Mizuno, T. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Japan ; Liu, Y.S. ; Shionoya, W. ; Yasuoka, K.
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EL (electroluminescence) in several polymeric materials was investigated in the electric field range <90 kV/mm. We used polymeric films with semi-transparent gold electrodes: low density polyethylene, polypropylene, polytetrafluoroethylene and polyvinylchloride. The EL characteristics were very low EL inception fields (2 to 20 kV/mm) which strongly depend on the material and very low energy photon emission (mainly in the red region of 1.6 to 1.8 eV). These results reveal that EL emission occurs predominantly in the metal-polymer interface region rather than in the bulk of the polymer at the applied field. We present a model of EL emission in the metal-polymer interface region to explain our results qualitatively. In this model, the mechanism of EL emission is the radiative recombination of the electrons and holes trapped at the surface states of the polymer, which causes photon emission in the red region. The EL inception field and EL intensity depend on the density of the surface states of the polymers

Published in:

Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:4 ,  Issue: 4 )

Date of Publication:

Aug 1997

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