摘要
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。
The influence of delocalization possibility on the mixing interaction between the conduction band of SrS and the excited levels of Ce 3+ was analysed. This mixing interaction makes the electrons located at the excited states of luminescent centers easily be ionized into the conduction band of host under the high electric field, and makes the conduction electrons easily be captured by the ionized luminescent centers under the low electric filed. The measurement of emission wave forms of SrS∶Ce TEFL showed that only a leading edge emission peak was observed for one sample and the leading and trailing edge emission peaks were observed for another in a half period of sinusoid applied voltage. This difference is related to the influences of sulfur vacancies on the excitation and emission processes. The leading edge emission is dominantly attributed to discrete luminescence caused by direct impact excitation and the trailing edge emission, and a part of leading edge emission are attributed to recombination luminescence caused by impact ionization and delocalization.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1999年第3期208-212,共5页
Journal of the Chinese Society of Rare Earths
关键词
稀土
铈
硫化锶
复合发光
电致发光
薄膜
Rare earths, Cerium, Strontium sulphide, Recombination luminescence, Electroluminescence
