ABSTRACT
Recent rapid progresses of colloidal syntheses have enabled one to obtain strongly photoluminescent Π-VI nanocrystals like CdSe[l,2], CdS[3] and CdTe[4]. These size dependent photoluminescence (PL) attracts a lot of attentions in these days. Organometallic chemical methods, which is usually called a TOPO method [1,2], give a high emission efficiency. However, aqueous methods [3,4] have an advantage of their simplicity, safety for mass production, a possibility of further processing like a sol-gel method, and potential application for biological staining by making use of its good solubility (or dispersibility like a molecule) in water. Recently, we have prepared watersoluble ZnSe nanocrystals in order to get a strong PL in a blue spectral region. We showed the prepared ZnSe nanocrystals have a particle diameter of 2-3 nm by X-ray diffraction and transmission electron microscopy. [5] In this paper, the PL and absorption behavior of this system are analyzed and the formation mechanism of the nanocrystals is discussed.
