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

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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.