Chemistry of Luminescent Porous Silicon

这项工作的目标是了解 发光的多孔硅，并探讨关系 发光和表面化学之间的联系。 的 第一个目标将通过检验目前的三个假设来实现 解释多孔硅的光致发光。 第二个目标 将通过观察排放发生的变化来实现 强度、波长和材料暴露的寿命 各种化学试剂如刘易斯酸或碱， 电子、空穴或能量转移剂，以及极性或可极化的 物种 多孔硅发光猝灭的机理 将对气相物种进行研究。 硅表面 化学将通过调整猝灭反应来发展， 特定吸附物。 多孔硅改变其荧光的独特能力 颜色和强度在化学吸附物的存在下， 气体、液体和生物的一系列可能的应用 传感器. 此外，了解基本的 在这些条件下多孔硅的物理特性可能导致 全彩色平板电致发光的发展 显示屏 这些潜在的发展可以建立在良好的基础上， 建立了硅加工技术。 的关键贡献 拟议的工作是界定化学品， 发光多孔硅的光化学反应模式， 为开发此类产品提供设计规则， 应用.

The goal of this work is to understand the origin of luminescence in porous silicon, and to explore the relationship between luminescence and surface chemistry of this material. The first goal will be achieved by testing the three current hypotheses explaining photoluminescence in porous silicon. The second goal will be achieved by observing the changes that occur in emission intensity, wavelength, and lifetimes on exposure of the materials to various chemical reagents such as Lewis acids or bases, electron, hole, or energy transfer agents, and polar or polarizable species. The mechanism of luminescence quenching of porous silicon by gas phase species will be studied. The silicon surface chemistry will by developed by tuning the quenching response for specific adsorbates. The unique ability of porous silicon to change its fluorescence color and intensity in the presence of chemical adsorbates opens up a range of possible application for gas, liquid, and biological sensors. In addition, an understanding of the fundamental photophysics of porous silicon under these conditions may lead to the development of full-color flat panel electroluminescence displays. these potential development can build on well- established silicon processing technology. The key contribution of the proposed work is that it will define the chemical and photochemical reactivity patterns of luminescent porous silicon, providing the design rules for the development of such applications.