Control of nano silicon phosphorescence and application to optical devices

研究了氧化后的纳米硅层的蓝色磷光。它起源于材料氧化物部分的分子物种。硅纳米晶不参与发射过程。它包括6个具有振动起源的子带，其各自的强度可以通过改变激发能量来调节。在紫外区(275-290 nm)发现了一个新的发射带，这是由于吸附在多孔材料孔表面的与水有关的分子物种。研究了其在化妆品、医药、显示器和光伏等领域的应用。已经获得了红色、蓝色或白色发光粉末。还研制了强绿色(Tb掺杂)、红色(Eu掺杂)和红外(Er掺杂)的样品。对于电活性器件，利用超临界方法开发了一种在纳米硅孔内沉积金属的新技术。这些层还有望成为光伏的宽禁带材料。

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.