中国激光, 1998, 25 (11): 1023, 网络出版: 2006-10-18
II-VI多量子阱中局域化激子的受激发射
Study on Emissions from Localized Excitons in Ⅱ-Ⅵ Multiple Quantum Wells
摘要
通过对ZnxCd1-xTe-ZnTe多量子阱样品的光泵受激发射研究讨论了材料中激子局域态对受激发射激子过程以及受激发射特性的影响。两块不同组份和不同局域态密度的ZnCdTe-ZnTe多量子阱样品受激发射过程都是n=1重空穴激子参与的一系列过程,但在Zn0.67Cd0.33Te-ZnTe中发现了激子-激子散射的受激发射过程,而在Zn0.78Cd0.22Te-ZnTe中没有发现这一受激发射的激子过程。x=0.67的样品中具有较高的局域化激子密度,其受激发射具有较高的阈值。
Abstract
In this paper, the effects of density of localized exciton states on stimulated emission processes have been reported. In our experiments, two samples of Zn x Cd 1-x Te ZnTe mutiple quantum wells which with different concentration are employed, and the stimulated emissions from the localizid states are observed in each of them. The density of localized exciton states in Zn 0.67 Cd 0.33 Te ZnTe MQWs is much greater than that in Zn 0.78 Cd 0.22 Te-ZnTe MQWs. The stimulated emission processes was found to be an exciton-ecciton scattering processes, but it was not found in Zn 0.78 Cd 0.22 Te-ZnTe MQWs. It seems to be very important for localized exciton to create stimulated emissions, but too high density of localized exciton states may greatly affect the stimulated emissions.
郑泽伟, 石汉青, 范希武, 郑著宏, 张吉英. II-VI多量子阱中局域化激子的受激发射[J]. 中国激光, 1998, 25(11): 1023. 郑泽伟, 石汉青, 范希武, 郑著宏, 张吉英. Study on Emissions from Localized Excitons in Ⅱ-Ⅵ Multiple Quantum Wells[J]. Chinese Journal of Lasers, 1998, 25(11): 1023.