高直流电场下PET薄膜的电致发光及其可靠性

用自制电致发光(Electrolum inescence-EL)测量装置测试了直流高电场下聚对苯二甲酸乙二酯poly(ethylene terephthalate)-PET]薄膜EL的光强和光谱。实验表明:PET的发光光强随所加电场而增大,在4.00MV/cm附近发生预击穿。EL光谱在300~400nm、400~460nm、500~600nm和680nm附近存在发射峰,其中500~600nm峰带相对较强,预击穿信号出现后680nm附近的峰带增加很快。为了评价PET的介电性能,本文对实验数据用双参数Weibull分布解析法计算,得出了该薄膜在(24±1)℃,阶跃加压条件下的寿命和击穿电场的累积失效概率和可靠度方程,Weibull假设检验结果表明,实验结果服从Weibull分布。

Study on the Electroluminescence and Reliability of PET Films under High DC Fields

The EL intensity and the spectrum of the PET films were tested under dc high electric fields by home-made experimental set-up. The result shows that the light emissio intensity of the PET films increases along with the electric fields; the pre-breakdown field is about 4.00 MV/cm. The EL spectra have emission peaks at 300~400 nm, 400~460 nm, 500~600 nm and 680 nm, the peaks between 500 nm and 600 nm is higher. The peak of 680 nm increases quickly after the pre-breakdown phenomenon appears. In order to value the dielectric character of the PET films, the experimental data were analyzed by the analysis of two-parameter Weibull distribution, the life time, the cumulative failure probability of the breakdown field and the reliability equation were found out under the voltage power increased step by step at (24±1)℃. After the verification of assumption, it’s found that the experimental results submit Weibull distribution.