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

9411179 Risbud本研究计划的重点是研究将隔离在玻璃基质中的氮化镓-氮化铝纳米半导体的合成、加工和光学性能。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凝胶工艺的新组合来制备。合成了玻璃中含有氮化镓和氮化镓-氮化铝量子点的复合材料，并用高分辨电子显微镜和小角X射线散射技术对其纳米结构进行了表征。将进行平行的光学光谱表征，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测量的量子点尺寸相关联。这项工作的结果将为宽禁带氮化物半导体在光子器件中的应用奠定基础。制备小于人类头发厚度五个数量级的材料(纳米尺寸)是当代材料研究的一个重要前沿领域，因为在这个尺寸范围内，材料的光学和电学性质发生了巨大的变化。半导体材料的纳米簇，如硅或两种或两种以上元素的化合物，将对微型激光、平板显示器和笔记本电脑等新兴技术产生重大影响。该课程的一个重要特点是在材料和工艺研究的基础和技术领域对研究生和本科生进行培训。***

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. ***