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Alternating current driven ZnS thin-film electroluminescent devices (ACTFELDs) have been investigated under continuous-wave ultraviolet (UV) irradiation. Under specific experimental conditions, UV irradiation can erase the residual polarization between two electric pulses which is caused by stored charges in the semiconductor and the semiconductor-insulator interfaces. No photodielectric effects have been observed. The reduction of the residual polarization allows one to investigate the role of the space charge in ACTFELDs, by comparing the excitation efficiencies with and without UV irradiation.
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Zeinert et al. (1994) studied this question.
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