Research on energy transfer via nanocrystals and their new functionality as optical materials

在这项工作中，一个新的功能的纳米晶体作为“能量供体”或“能量传输器”的能量传递过程中进行了研究。以下是在这项工作中获得的结果列表。1.研究了硅纳米晶与铒离子之间的能量传递机制，揭示了两种不同的能量传递过程。2. Si纳米晶体中的杂质（P和/或B原子）与Er离子之间的相互作用的证据被示出，并且阐明了Er离子通过俄歇型能量转移到Si纳米晶体中的杂质而有效地去激发。3.从Si纳米晶体的能量转移到Er离子的速率示出被修改通过放置附近的金属薄膜。结果强烈地表明，能量转移效率可以通过使用金属层来增强。4.研究了掺金纳米晶对玻璃中Er发光的增强作用，阐明了Au纳米晶表面等离子激元对增强的贡献。5.通过在硅纳米晶附近放置金薄膜和有机光栅，证明了由硅纳米晶的能量转移激发金薄膜的表面等离子体激元。

In this work, a new function of nanocrystals as "energy donor" or "energy transmitter" in an energy transfer process is studied. Followings are the list of results obtained in this work. 1. The mechanism of energy transfer from Si nanocrystals to Er ions is studied and the existence of two different energy transfer processes is revealed. 2. The evidence of the interaction between impurities (P and/or B atoms) in Si nanocrystals and Er ions is shown and efficient deexcitation of Er ions by Auger type energy transfer to impurities in Si nanocrystals is clarified. 3. The rate of energy transfer from Si nanocrystals to Er ions is shown to be modified by placing a metal thin film nearby. The results strongly suggest that the energy transfer efficiency can be enhanced by using a metal layer. 4. The enhancement of PL from Er in glasses by simultaneoulsy doping gold nanocrystals is demonstrated and the contribution of surface plasmon polaritons of Au nanocrystals for the enhancement is clarified. 5. Excitation of surface plasmon polaritons of a gold thin film by energy transfer from Si nanocrystals is demonstrated by placing a gold thin film and organic grating near Si nanocrystals.