Light emission has been observed when stressing polymer films withan AC voltage. Films of thicknesses between 25 and 100 μm were usedin this study. The work was done using a low-density polyethylene ofcable grade without additives. A semitransparent gold layer wassputtered. For the same setup no light could be detected under DCstress. The fact that the light is field-independent and decreases whenthe transmission of light through the gold layer is decreased byincreasing the thickness, indicates that the polymer is involved in thelight emission. If so, the bulk of the polymer material and/or thevolume closest to the electrodes could be responsible
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