Gelloz Bernard, Loni Armando, Canham Leigh, Koshida Nobuyoshi
Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
Nanoscale Res Lett. 2012 Jul 11;7(1):382. doi: 10.1186/1556-276X-7-382.
We have studied the photoluminescence of nanocrystalline silicon microparticle powders fabricated by fragmentation of PSi membranes. Several porosities were studied. Some powders have been subjected to further chemical etching in HF in order to reduce the size of the silicon skeleton and reach quantum sizes. High-pressure water vapor annealing was then used to enhance both the luminescence efficiency and stability. Two visible emission bands were observed. A red band characteristic of the emission of Si nanocrystals and a blue band related to localized centers in oxidized powders. The blue band included a long-lived component, with a lifetime exceeding 1 sec. Both emission bands depended strongly on the PSi initial porosity. The colors of the processed powders were tunable from brown to off-white, depending on the level of oxidation. The surface area and pore volume of some powders were also measured and discussed. The targeted applications are in cosmetics and medicine.
我们研究了通过多孔硅（PSi）膜破碎制备的纳米晶硅微粒粉末的光致发光特性。研究了几种孔隙率情况。部分粉末在氢氟酸（HF）中进行了进一步化学蚀刻，以减小硅骨架尺寸并达到量子尺寸。随后采用高压水蒸气退火处理，以提高发光效率和稳定性。观察到两个可见发射带。一个是硅纳米晶体发射特有的红色带，另一个是与氧化粉末中的局域中心相关的蓝色带。蓝色带包含一个长寿命成分，其寿命超过1秒。两个发射带都强烈依赖于PSi的初始孔隙率。根据氧化程度，处理后的粉末颜色可从棕色调至灰白色。还对部分粉末的表面积和孔体积进行了测量和讨论。目标应用领域为化妆品和医学领域。
