Zn0.83Mn0.17Se和ZnSe/Zn0.84Mn0.16Se超晶格材料中Mn^2＋的压力光谱研究

Study on Photoluminescence of Mn^(2+) in Zn_(0.83)Mn_(0.17)Se and ZnSe/Zn_(0.84)Mn_(0.16)Se Superlattics under Pressures

采用压力光谱技术在低温下观测到了Mn2+离子的4 T1→6 A1跃迁,该谱线在Zn0.83Mn0.17Se和ZnSe/Zn0.84Mn0.16Se超晶格样品中有不同的压力行为,体材料中其压力系数为-42.4peV/Pa,超晶格中为-29.5peV/Pa。用晶体场理论计算得到体材料Zn0.83Mn0.17Se中Mn2+离子4 T1→6 A1谱线的压力系数为-38.3peV/Pa,与实验结果基本一致。结合材料中发光峰积分强度随压力的变化关系进行分析,证实Mn2+离子的发光性质主要与其近邻的晶体场环境有关。

The photoluminescence of Mn^2＋ in Zn0.83Mn0.17Se and ZnSe/Zn0.84Mn0.16Se superlattics was investigated at different pressures.The ^4T1→^6A1 transition of Mn^2＋,which shows different pressure dependence in bulk materials and superlattics,was observed.The pressure coefficients obtained from them are-42.4 and-29.5 peV/Pa,respectively.The theoretical calculation for pressure coefficient of the emissions in Zn0.83Mn0.17Se gave the result-38.3 peV/Pa,which is almost consistent with experiment.Further analysis of pressure dependence for emission intensity confirms that the emission characteristic of Mn^2＋ was mainly affected by near crystal field.Their different properties mainly root in different band structures and strains in ZnSe/Zn0.84Mn0.16Se superlattics.