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含ZnS∶Mn²⁺纳米晶玻璃中Mn²⁺三种格位态的EPR研究

THREE TYPES OF SITES OF Mn²⁺ IN DIPERSED ZnS∶Mn²⁺ NANOCRYSTALS GLASSES

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【Author】 Liu Junye, Liu Chunxu, LI Dan, DOU Kai, XU Wu, YU Jiaqi (Changchun Institute of Physics, Chinese Academy of Sciences, Changchun 130021, China) ZHENG Yingguang (Laboratory of Excited State Processes, Chinese Academy of Sciences, Changchun 130021,

【机构】中国科学院长春物理研究所!吉林长春130021；中国科学院激发态物理开放研究实验室；吉林长春130021；

【摘要】通过对ＺｎＳ∶Ｍｎ２＋不同含量的钠硼硅玻璃发光和激发光谱测量，发现Ｍｎ离子可能占据替位（Ｍｎ２＋）Ｓｕｂ和间隙（Ｍｎ２＋）ｉｎｔ两种格位．进一步的电子顺磁共振（ＥｌｅｃｔｒｏｎＰａｒａｍａｇｎｅｔｉｃＲｅｓｏｎａｎｃｅ，ＥＰＲ）实验证实了这一判断，并从ＥＰＲ谱确认（Ｍｎ２＋）Ｓｕｂ，（Ｍｎ２＋）ｉｎｔ和Ｍｎ团三种格位态的存在．观测到ｇ因子和超精细结构（ＨＦＳ）常数随纳米晶粒径的减小而增大．这可能是由于量子限域效应下ＺｎＳ的ｓｐ３和Ｍｎ的３ｄ５电子态杂化和表面态所引起的．更多还原

【Abstract】 It was found that Mn 2+ may occupy (Mn 2+ ) sub and (Mn 2+ ) int sites by luminescence and excitation spectra. EPR measurements support this conclusion. (Mn 2+ ) sub , (Mn 2+ ) int and nclusters were identified. The g factor and HFS constants increases with decreasing the diameters of the nanocrystals. It might be due to the hybridization between sp and d states by quantum confinement effects and the surface states.更多还原