稀土掺杂铁电体/纳米金属复合薄膜结构的原位可逆多重发光调控

项目名称： 稀土掺杂铁电体/纳米金属复合薄膜结构的原位可逆多重发光调控

项目编号： No.11274150

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 王绩伟

作者单位： 辽宁大学

项目金额： 95万元

中文摘要： 选择铁电材料作为基质，稀土离子作为掺杂离子，透明导电薄膜作为电极，纳米贵金属作为增强表面，以磁控溅射等物理方法制备新型稀土掺杂铁电体/纳米金属复合薄膜增强体系。原创性地将压电效应与金属表面荧光增强效应有机结合在一起，实现了对发光离子与金属表面间距和发光过程的原位可逆实时调控。同时克服了化学制备方法与调控手段存在的体系不均匀和缺陷杂质较多的缺点，使增强的荧光测量结果与确定的间距和形貌相对应，更深入地揭示了金属表面荧光增强机制。该复合体系为研究发光调控提供了物理模型：可利用压电效应调控对晶场变化敏感的d组态能级的位置结构，以及对激活离子间距敏感的能量传递过程，进而发挥d-f跃迁宇称允许和宽带强发射的优势；能定量地分析外电场的影响；将外电场对金属表面费米能级和等离子体共振耦合的调控，与对d组态的调控相结合，有望获得d-f跃迁荧光表面增强的新发现；研发出基于多种物理效应的铁电基质复合发光调控。

中文关键词： 稀土；金属表面荧光增强；发光调控；铁电材料；压电效应

英文摘要： In this project, ferroelectric materials are chosen as the doped substrates, lanthanide ions as doping activated ions, transparent conductive films as electrodes and noble nano metals as fluorescence enhanced surfaces, to prepare rare earth doped ferroelectrics/nano metals composite film with physical growth methods, such as magnetron sputtering method. Herein the piezo-effect and metal surface enhancement join together to modulate the distance between the metal surface and activated ion, and its enhanced fluorescence, in an in-situ, real-time and reversible way for the first time. Meanwhile the disadvantages of inhomogeneities and defects arising from chemical synthesis and modulation process are suppressed. Therefore the measurements of enhanced fluorescence become intimately related to the determined shape and distance of nano metals, and thus the mechanisms of metal-enhanced fluorescence are expected to be further clarified. This novel ferroelectrics/nano metals composite system facilitates a physical model to investigate the luminescence modulations. Thus the energy structures of d levels and energy transfer between lanthanide ions which are sensitive to crystal field and their distance respectively can be modulated by piezo-effect, and the advantages of the permissible parity for d-f transitions and their

英文关键词： Rare earths；Metal surface enhanced fluorescence；Luminescence modulation；Ferroelectric materials；Piezo effects