Recently, Si nanocrystals (Si NCs) have been attracting more and more interest in many fields of nanoscience and nanotechnology.This booming prospect arises from its unique advantages such as high abundance, low cost, minimal toxicity and favorable biocompatibility.When superior properties are obtained, Si NCs have been widely accepted as a promising alternative candidate to well-studied Ⅱ/Ⅵ QDs in many fields such as optoelectronic and biomedical applications.