Paleari Alberto, Golubev Nikita V, Ignat'eva Elena S, Sigaev Vladimir N, Monguzzi Angelo, Lorenzi Roberto
Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy.
P.D. Sarkisov Int. Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190, Moscow, Russia.
Chemphyschem. 2017 Mar 17;18(6):662-669. doi: 10.1002/cphc.201601247. Epub 2017 Jan 31.
Incorporation of doping ions in nanocrystals is a strategy for providing nanophases with functions directly related to ion features. At the nanoscale, however, doping can also activate more complex effects mediated by perturbation of the nanophase size and structure. Here, we report a paradigmatic case in which we modify grown-in-glass γ-Ga O nanophases by nickel or titanium doping of the starting glass, so as to control the concentration of oxygen and gallium vacancies responsible for the light emission. Optical absorption and luminescence show that Ni and Ti ions enter into the nanophase, but differential scanning calorimetry and X-ray diffraction indicate that Ni and Ti also work as modifiers of nanocrystal growth. As a result, doping influences nanocrystal size and concentration, which in turn dictate the number of donors and acceptors per nanocrystal. Finally, the chain of effects turns out to control both the intensity and spectral distribution of the light emission.
在纳米晶体中掺入掺杂离子是一种为纳米相赋予与离子特性直接相关功能的策略。然而，在纳米尺度上，掺杂还可通过纳米相尺寸和结构的扰动激活更复杂的效应。在此，我们报道了一个典型案例，即通过对起始玻璃进行镍或钛掺杂来修饰玻璃中生长的γ-Ga₂O₃纳米相，从而控制负责发光的氧和镓空位的浓度。光吸收和发光表明镍和钛离子进入了纳米相，但差示扫描量热法和X射线衍射表明镍和钛也起到了纳米晶体生长改性剂的作用。结果，掺杂影响纳米晶体的尺寸和浓度，进而决定每个纳米晶体中施主和受主的数量。最后，这一系列效应最终控制了发光的强度和光谱分布。
