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实验研究了ZnS:Cu电致发光薄膜材料的交流电压传感特性。将被测交流电压直接施加于电致发光薄膜样品,通过测量样品的发光亮度与外加电压之间的关系实现了电压测量。在25℃室温条件下,实验测量了有效值为50V至350V的工频交流电压,发现样品的发光亮度与被测电压有效值之间具有较好的线性关系,实验数据的非线性误差低于2.8%;实验研究了样品的发光亮度、发光阈值电压以及击穿电压与被测电压频率之间的相关性。结果表明,该电致发光薄膜样品的发光亮度随被测电压频率变化关系曲线存在极大值,发光阈值电压和击穿电压均随被测电压频率的增加而降低。
The AC voltage sensing characteristics of ZnS: Cu electroluminescent thin films were experimentally studied. The measured AC voltage is applied directly to the electroluminescent film sample, and the voltage measurement is achieved by measuring the relationship between the luminescence intensity of the sample and the applied voltage. Under the condition of 25 ℃ room temperature, the AC voltage of 50 V to 350 V was measured experimentally. The linearity between the luminescence intensity of the sample and the RMS value of the measured voltage was found. The nonlinearity error of the experimental data was lower than 2.8%. The luminescence intensity, luminescence threshold voltage and the correlation between the breakdown voltage and the measured voltage frequency were studied experimentally. The results show that the luminescence brightness of the electroluminescent thin film sample has the maximum value with the change of the measured voltage and frequency. The threshold voltage and the breakdown voltage decrease with the increase of the measured voltage frequency.