这是由于杂质和缺陷电离产生的局域电场导致发光层中的平均电场强度和外电加电压不成线性关系，此平均电场强度高于外电场强度。

The reason was that, in high applied voltage, the average intensity of electric field was higher than that of external electric field for the ionization of impurities and defects.

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结果：样品中两种成分完全分离且线性关系良好，对乙酰氨基酚和咖啡因的加样回收率分别为99.3%和100.2%。

Result:Two components were completely separated and determined. The average recoveries were 99.3% for paracetamol and 100.2% for caffeine, respectively.

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