纳米硫化锌的原位制备及其对多孔硅复合体系发光的调控

Zn S的带隙较宽 ,欧姆接触较差 ,并不是一种理想的半导体 .但将多种材料与硫化锌复合 ,在一定程度上可以克服这种缺陷 1] .相关的文献报道主要集中在 Zn S∶ M( M=Mn,Cu,Ag等 ) ,Zn S∶ RE( RE=Sm,Tb,Eu等 ) ,Zn S∶ Cd S和 Zn S∶ Zn Se等复合材料上 ,同时也有关于多孔硅 ( PorousSilicon,PS)掺杂稀土 2 ] 和有机物 3,4 ] 以及 PS- Cd S5～ 7] 的报道 ,但是尚未见到在多孔硅基体上原位制备硫化锌纳米材料的报道 .本文利用一种新颖、简单的化学方法 ,通过多相反应 ,在多孔硅基体的表面和纳米孔内制得纳米级的 Zn S,从而…

Luminescence Modulation of Porous Silicon-Zinc Sulfide Nanocomposite by in situ Synthesis of Zinc Sulfide

Porous silicon-zinc sulfide nanocomposite(PS-ZnS) was prepared by in situ synthesis of ZnS via a simple polyphase reaction on the base of nano-PS. The formation of the composite was confirmed by X-ray diffraction(XRD), field emission scanning electron microscopy(FE-SEM), energy dispersive spectroscopy(EDS) and photoluminescence(PL) measurements. Based on the XRD data and the Debye-Scherrer equation, the size of the formed ZnS particles both on the surface and in the holes of the PS was calculated to be nano-scaled, ca. 5—7 nm. FE-SEM observation showed agglomeration for the ZnS particles with an average crystallite size of 30—40 nm, and the hole diameter of the PS was below 100 nm. PL measurements and CIE diagram analysis for the PS-ZnS composite samples indicated that the emitted light color from the composites could be modulated and controlled by changing the annealing conditions, from orange to violet-blue, and finally, white-light emitter of the composite was obtained.