PPV/ZnS薄膜器件发光及电导的研究

Study of Luminescence and Conductance of PPV/ZnS Device

以Ⅱ－Ⅵ族无机半导体ＺｎＳ替代双层有机薄膜电致发光器件的电子传输层，以ＰＰＶ为空穴传输层和发光层制备出发光器件，得到发光亮度和效率都比单层ＰＰＶ器件高的电致发光器件。器件结构为ＩＴＯ／ＰＰＶ／ＺｎＳ／Ａｌ。器件的电致发光光谱同单层ＰＰＶ器件的光谱基本相同，但启亮电压只有４．５Ｖ，亮度也比单层器件高一个量级。通过ＰＰＶ层自吸收现象可判断出发光区域在ＰＰＶ／ＺｎＳ界面处。器件的电流密度与电压的二次方成线性关系。

By using ZnS as electron transport layer and PPV as hole transport and emission layer,we have constructed PPV/ZnS electroluminescent device.The spectrum of ITO/PPV/ZnS/Al is similar to ITO/PPV/Al device,but the threshold voltage is only 4.5V,it is lower than that of single layer.The quantum efficiency is one order higher than that of single layer device,and the power efficiency is about several times higher than that of single layer device.The current density-voltage characteristic can be described by SCLC model.