Non-Hydrolytic Gel Processing and Optical Properties of Wide-Bandgap Gallium Nitride-Aluminum Nitride Semiconductor Quantum Dots

9411179 里斯巴德 本研究计划的重点是研究氮化镓-氮化铝纳米尺寸半导体的合成，加工和光学特性，这些半导体将被隔离在玻璃基质中。这些量子点材料将通过用于氮化物化合物的基于有机前体的合成化学路线和用于玻璃基质的无水非水解凝胶工艺的新型组合来制备。 将合成在玻璃中含有氮化镓和氮化镓-氮化铝量子点的复合材料，并使用高分辨率电子显微镜技术和小角度X射线散射表征纳米结构。 将进行并行光学光谱表征，以获得吸收和发光数据，这些数据将与在各种条件下处理的样品中量子点的测量尺寸相关。所提出的工作的结果将有助于在一个根本的方式，以新的科学的宽带隙氮化物半导体的光子器件的应用。 %%% 制备具有比人类头发厚度小五个数量级（纳米尺寸）的结构的材料是当代材料研究的重要前沿领域，因为在该尺寸范围内材料显示出光学和电子性质的显著变化。 半导体材料如硅或两种或多种元素的化合物的纳米团簇将对微型激光器、平板显示器和笔记本电脑等新兴技术产生重大影响。 该计划的一个重要特点是在材料和加工研究的基本和技术重要领域培养研究生和本科生。 ***

9411179 Risbud The focus of the present research program is to investigate the synthesis, processing and optical properties of Gallium Nitride-Aluminum Nitride nanometer size semiconductors that will be sequestered in a glass matrix. These quantum dot materials will be prepared by a novel combination of organic precursor based synthetic chemistry routes used for nitride compounds and an anhydrous non-hydrolytic gel process for the glass matrix. Composite materials containing Gallium Nitride and Gallium Nitride-Aluminum Nitride quantum dots in glass will be synthesized and characterized for nanostructure using high resolution electron microscopy techniques and small angle x-ray scattering. Parallel optical spectroscopic characterization will be performed to obtain absorption and luminescence data that will be correlated with measured sizes of quantum dots in samples processed under a variety of conditions. The results of the proposed work will contribute in a fundamental way to the new science of wide band gap nitride semiconductors for photonic device applications. %%% The preparation of materials with architectures as small as five orders of magnitude smaller than the thickness of human hair (nanometer sizes) is an important frontier area of contemporary materials research because in this size range materials show dramatic changes in optical and electronic properties. Nanoclusters of semiconductor materials like silicon or compounds of two or more elements will have a significant impact on the emerging technologies of miniature lasers, flat panel displays, and laptop computers. An important feature of this program is the training of graduate and undergraduate students in a fundamentally and technologically significant area of materials and processing research. ***