Control of nano silicon phosphorescence and application to optical devices

研究了纳米硅氧化层的蓝色磷光。它来源于材料氧化物部分的分子物种。硅纳米晶体不参与发射过程。它包括6个具有振动原点的子带，并且可以通过改变激发能量来调谐其各自的强度。在275-290 nm范围内发现了一个新的紫外发射带，这是吸附在多孔材料表面的与水有关的分子物种的结果，并研究了其在化妆品、医药、显示器和光化学等方面的应用。已经获得了红色、蓝色或白色发光粉末。还开发了发射强绿色（Tb掺杂）、红色（Eu掺杂）和红外（Er掺杂）的样品。对于电活性器件，已经开发了一种使用超临界方法在纳米硅孔内沉积金属的新技术。该层也有希望作为用于光致发光的宽带隙材料。

The blue phosphorescence of oxidized nano-silicon layers has been investigated. It originates from molecular species in the oxide part of the material. Silicon nanocrystals are not involved in the emission process. It includes 6 sub-bands having vibrational origin and which respective intensities can be tuned by changing the excitation energy. A new band emitting in the ultraviolet region (275-290 nm) was found and attributed to water-related molecular species adsorbed at the surface of the porous material pores.Applications in cosmetics, medicine, display and photovoltaics, have been studied. Red, blue or white emitting powders have been achieved. Samples emitting strong green (Tb doping), red (Eu doping) and also infrared (Er doping) were also developed. For electrically active devices, a new technique of metal deposition inside nano-silicon pores has been developed using a supercritical method. The layers are also promising as wide bandgap material for photovoltaics.