MRI: Acquisition of Equipment for Thermal and Optical Studies of Sol-gel Materials Containing Rare Earth Ions

MRI:购置用于含稀土离子溶胶-凝胶材料的热和光学研究的设备

基本信息

  • 批准号:
    0421023
  • 负责人:
  • 金额:
    $ 12万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2004
  • 资助国家:
    美国
  • 起止时间:
    2004-09-01 至 2007-08-31
  • 项目状态:
    已结题

项目摘要

Sol-gel synthesis provides a low temperature means for preparing optically transparent amorphous materials that are safer, more energy efficient and more cost effective to produce than traditional glasses made by thermally quenching molten material. One attractive aspect of sol-gel synthesis is that the optical properties of a dry gel that has been annealed to temperatures near ~1000 C approach that of a melt glass of similar composition. Sol-gel materials doped with rare earth (RE) ions are used in many optical applications including lasers, environmental and biological sensors, solar concentrators, active waveguides, phosphors and other photonic materials. The incorporation RE ions in sol-gels is interesting from a fundamental standpoint because information about the nature of the host, and how the host and RE exchange energy, may be gained by studying the host's influence on the optical properties of the RE ion. A more complete understanding of the relevant energy transfer interactions is needed. Previous work has concentrated on spectroscopic studies of either dried gels or fully annealed glasses. In contrast, this project proposes to correlate optical behavior with changes in the RE environment as the material is processed from dried gel to glass. Thermodynamic measurements during the evolution of the sol-gel materials will provide information about the host composition and structure, and an applied external electrical field will be used to modify the RE local environment by controlling the presence and motion of free ions within the material. With this information, it is hoped that the optical properties can be improved so that these materials may find greater practical application. This undergraduate research project will study sol-gel materials containing rare earth (RE) ions. The sol-gel process is a low temperature method for preparing transparent media that may easily be doped with a variety of optically active elements. Sol-gel materials doped with RE ions are used in many applications including lasers, environmental and biological sensors, solar concentrators, active waveguides, phosphors and other photonic materials. Two issues have been identified that limit the fluorescence yield of sol-gel materials doped with optically active RE ions: the presence of hydroxyl groups provides non-radiative pathways via multi-phonon relaxation, and the clustering of RE ions facilitates both energy migration and cross relaxation. This project will follow new lines of inquiry to address these important problems. Thermodynamic measurements during the evolution of the sol-gel materials, such as simultaneous differential scanning calorimetry and thermogravimetric analysis, will provide information about the host composition and structure as a dry gel densifies upon heating. Further, an applied external electrical field will be used to modify the RE local environment by controlling the presence of free ionic components. At all stages in the synthesis process, RE spectroscopy will be used to probe the materials, providing information that complements the knowledge gained from the thermal and electrical experiments. After the sol-gel materials are fully densified, the nature of energy transfer interactions among RE ions will be investigated with time-resolved spectroscopic measurements and with spectral hole burning, a high resolution saturation spectroscopy technique. It is hoped that through these studies the quantum yield and other optical properties of these materials can be improved.
溶胶-凝胶合成提供了一种用于制备光学透明非晶材料的低温方法,与通过热淬火熔融材料制成的传统玻璃相比,该材料的生产更安全、更节能且更具成本效益。 溶胶-凝胶合成的一个有吸引力的方面是,退火至接近 1000 C 的温度的干凝胶的光学性质接近于具有相似成分的熔融玻璃。 掺杂稀土 (RE) 离子的溶胶-凝胶材料用于许多光学应用,包括激光器、环境和生物传感器、太阳能聚光器、有源波导、磷光体和其他光子材料。 从基本角度来看,溶胶-凝胶中稀土离子的掺入很有趣,因为有关主体性质以及主体和稀土如何交换能量的信息可以通过研究主体对稀土离子光学性质的影响来获得。 需要对相关能量转移相互作用有更全面的了解。 以前的工作主要集中在干燥凝胶或完全退火玻璃的光谱研究上。相比之下,该项目建议将材料从干燥凝胶加工成玻璃时的光学行为与稀土环境的变化相关联。溶胶-凝胶材料演化过程中的热力学测量将提供有关主体组成和结构的信息,并且所施加的外部电场将用于通过控制材料内自由离子的存在和运动来改变稀土局部环境。有了这些信息,希望能够改善光学性能,使这些材料能够找到更大的实际应用。 该本科研究项目将研究含有稀土 (RE) 离子的溶胶-凝胶材料。 溶胶-凝胶工艺是一种用于制备透明介质的低温方法,该介质可以很容易地掺杂各种光学活性元素。 掺杂稀土离子的溶胶-凝胶材料可用于许多应用,包括激光器、环境和生物传感器、太阳能聚光器、有源波导、磷光体和其他光子材料。 已经确定了限制掺杂光学活性稀土离子的溶胶-凝胶材料的荧光产率的两个问题:羟基的存在通过多声子弛豫提供非辐射途径,稀土离子的聚集促进能量迁移和交叉松弛。 该项目将遵循新的调查路线来解决这些重要问题。 溶胶-凝胶材料演化过程中的热力学测量,例如同步差示扫描量热法和热重分析,将提供有关干凝胶在加热时致密化的主体成分和结构的信息。 此外,所施加的外部电场将用于通过控制自由离子成分的存在来改变稀土局部环境。 在合成过程的所有阶段,稀土光谱将用于探测材料,提供补充从热和电实验中获得的知识的信息。溶胶-凝胶材料完全致密化后,将通过时间分辨光谱测量和光谱烧孔(一种高分辨率饱和光谱技术)研究稀土离子之间能量转移相互作用的性质。 希望通过这些研究能够提高这些材料的量子产率和其他光学性能。

项目成果

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Daniel Boye其他文献

Daniel Boye的其他文献

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{{ truncateString('Daniel Boye', 18)}}的其他基金

MRI-R2: Acquisition of Equipment for Rare Earth Spectroscopic Studies of Sol-Gel Glass Structure
MRI-R2:购置用于溶胶-凝胶玻璃结构稀土光谱研究的设备
  • 批准号:
    0959552
  • 财政年份:
    2010
  • 资助金额:
    $ 12万
  • 项目类别:
    Standard Grant

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