Porous Silicon Inlaid Dye Luminous And Electroluminescent Characteristics

In recent years, luminescence materials and photoelectron apparatus are developing rapidly, because of their wider applied foreground in terms of information display, light communication and so on. Come to light, crystalline silicon is support materials in electron industry now, but its application was restricted in the field of photoelectron, because its band gap is 1.12eV, and it belongs to indirection gap materials. Canham detected that porous silicon could emit visible light at room temperature in 1990, which brought hopes for photoelectron integration on silicon basis. The people's studious aim is that the silicon materials can realize high luminescence efficiency and prepare efficient laser apparatus and LED.In this paper, using the peculiarities of porous silicon: the structure of particular nanoporous, the mortal surface area, the strong capacity of absorption and the sensitive characteristic of surface luminescence, coumarin102 (C102) was impregnated into porous silicon, the composite system of porous silicon embedded C102 was obtained. Then the photoluminescence properties of this composite system were studied, and the blue-green photoluminescence on silicon basis was realized efficiently. Using I--V characteristics of PS LED, the carrier generation and transportation mechanisms in porous silicon were analyzed, and the causes of low luminescence efficiency and luminescence extinguishment were explained. It was advanced that the EL efficiency of PS could be improved if we could realize the carrier compound in quantum confinement Si granule at low bias.The first chapter was about the summarization of the applied investigation for porous silicon. In this chapter, several directions of the applied investigation for porous silicon were analyzed; Secondly the achievement of applied investigation for porous silicon in terms of PS-basis luminescence materials and eletroluminescence was narrated; At last, the wider applied foreground of poroussilicon was prospected.The second chapter was about the study on photoluminescence properties of porous silicon embedded organic dye. First, the luminescence mechanism of organic dye was introduced; Next, the luminescence properties of porous silicon embedded C102 was studied; At last, the changes of C102 embedded in porous silicon which was annealed in vacuum and atmosphere were discussed.By experimental measure, it was found that the luminescence of composite system of porous silicon embedded C102 was very stability. Compared the PL spectra of embedded C102 with the PL spectra of C102 in solid state and in liquid state, it was found that the PL of C102 embedded in porous silicon was similar to the PL of C102 in ethanol, behaved the characteristic of single molecule of dye, but it could not exclude that there was little conglomeration in this composite system. In addition, the symmetry of PL spectra of embedded C102 was improved. Compared the characteristic of C102 embedded in porous silicon which was came through two different anneal with porous silicon which was not disposed, it was found that oxidation could improve the adsorption and transparency of porous silicon, could inflect the energy transfer which occurred between impregnated dye and porous silicon, consequently, the PL intensity of this composite system was enhanced. In addition, the degree of conglomeration of the molecular of C102 embedded in porous silicon was increased, and the peak of PL exhibited red shift. These experimental results adequately proved that porous silicon was a good carrier, and could be applied in the solid laser apparatus. At the same time, this composite system of porous silicon embedded C102 might be a better approach of realizing the blue-green photoluminescence on silicon basis.The third chapter was about the study on electroluminescence of porous silicon. It was analyzed from two facets: one facet was the apparatus antetype of electroluminescence of porous silicon; The other facet was the I-V characteristic of PS LED. In this chapter, the carrier transportation properties of...