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OPTICAL PROPERTIES OF DOPED MATERIALS PREPARED BY SOL-GEL PROCESS FOR PHOTONICS

机译：溶胶-凝胶法制得的掺杂材料的光学性能

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Sol-gel, a low-temperature process used to produce primarily oxide-based ceramics and glasses, is gradually moving from the laboratory into the marketplace. An important feature of this technique is that it generally gives porous material, the scale of the pores being on a nanometer level. Porous glasses developed in this way contain nanometer-size voids that can be impregnated with dye molecules or nanocrystals [1]. The ability to prepare a systematically controlled sizes in SiO_2 porous matrix by sol-gel method is very appealing. Among various matrices that have been used to study the quantum dot properties, the SiO_2 porous matrix seems to be the most promising to develop the samples for optical devices [2]. This porous glass can be saturated with semiconductor material up to very high concentration (15% in the case of sol-gel matrix). CdS in form of nanoparticles is frequently used materials in the viewpoint of quantum-sized effects. The most important characteristics of quantized semiconductors are the increase in band gap with decreasing crystal size. In essence, this means that the electronic spectrum of a material can be controlled by physical means (crystal size) rather than by chemical composition [3].
机译：溶胶-凝胶是一种用于主要生产基于氧化物的陶瓷和玻璃的低温工艺，目前正逐渐从实验室转移到市场。该技术的重要特征是它通常提供多孔材料，孔的尺寸在纳米级。以这种方式开发的多孔玻璃包含可以被染料分子或纳米晶体浸渍的纳米级空隙[1]。通过溶胶-凝胶法在SiO_2多孔基质中制备系统可控的尺寸的能力非常吸引人。在已用于研究量子点特性的各种基质中，SiO_2多孔基质似乎是最有希望开发用于光学器件的样品的方法[2]。这种多孔玻璃可能会被半导体材料浸透，直至达到很高的浓度（在溶胶-凝胶基质的情况下为15％）。从量子尺寸效应的角度来看，纳米颗粒形式的CdS是常用的材料。量化半导体的最重要特征是带隙随晶体尺寸的减小而增加。从本质上讲，这意味着材料的电子光谱可以通过物理方式（晶体大小）而不是化学组成来控制[3]。

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