在分析Ce3+激发态能级与导带之间杂化相互作用的基础上,讨论了电场强度与场致电离之间的关系.实验测得的SrS:Ce TFEL发光波形表明,在正弦电压驱动下的半周期内,一种样品在上升沿有发光,而另一种样品在上升和下降沿有两个发光峰.这种不同的产生与样品中硫空位对SrS:Ce激发和发射过程的影响有关.上升沿的发光主要是由直接碰撞激发引起的分立中心的发光,而下降沿的发光及上升沿的部分发光属于因电离而引起的复合发光.
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