CdS在多层薄膜电致发光器件中的新应用

APPLICATION OF CdS TO MULTILAYER TFEL DEVICES

将ＣｄＳ蒸镀于电致发光器件中，测量这些器件的电学和光学特性，发现ＣｄＳ层可以提供较多的电子但是，样品ＩＴＯ／ＳｉＯ／ＳｉＯ２／ＺｎＳ：Ｘ／ＣｄＳ／ＳｉＯ２／ＳｉＯ／Ａｌ（Ｘ＝Ｍｎ２＋，Ｓｍ３＋的亮度明显低于不含ＣｄＳ的样品，说明这些电子在向ＺｎＳ层输运的过程中能量有所降低在样品ＩＴＯ／ＳｉＯ／ＳｉＯ２／ＺｎＳ：Ｘ／ＳｉＯ２／ＣｄＳ／Ａｌ中，ＣｄＳ产生的电子经过ＳｉＯ加速而获得了较高的能量，提高了ＴＦＥＬ器件发光亮度这一样品的亮度比上述含ＣｄＳ的样品的亮度高２．５个数量级，且其阈值电压较低，亮度－电压特性好．在这一样品达到饱和的电压下，含ＣｄＳ的样品才刚刚起亮，这说明该样品的发光主要是ＣｄＳ提供的电子对发光的贡献。

Q-V charater of the samples containing CdS is compared with that of the samples not containing. The transfer charge of the samples with CdS is more larger than that of the samples without CdS.This indecates that CdS can provide more electrons. But during these electrons transfer into ZnS layer, the energy is reduced. When these electrons are accelerated by SiO2, the luminescent intensity increases 2.5 times in orders. When the samples with CdS gets the maximum luminescent intensity, the samples without CdS just starts to emite at the same voltage. ms indicates that the lumineseence of the samples with CdS is due to the electrons from CdS.