Preparation And Optical Properties Of Mn Doped Ⅱ-Ⅵ Nano Materials Via Solvothermal Route

Wide-bandⅡ-Ⅵsemiconductor materials are the emitters with high efficiency in the range of blue-green. As the size of semiconductor nanocrystals decreases, the outstanding properties totally different from those of bulk materials were exhibited. Prospective applications of the nanocrystals may be found in many fields, such as high-speed optical calculation, optical switch, optical display and optical information storage. Since the optical properties of transition metal doped semiconductor nanocrystals ZnS:Mn were first reported by R.N.Bharagava in 1994, there are more and more people do their research on luminescence of ion-doped nanocrystals. As a novel method of preparing nano materials, solvothermal method is excellent due to its low temperature, lack of aggregation, controllability of particle shape etc. In this study, CdS nanorods, Mn doped CdS nanorods and Mn doped ZnS nano particles were prepared using solvothermal method. The preparing condition and their influence on the luminescence properties of samples were chiefly studied.The chief contents and results of this paper are listed below:1. CdS nanorods and nano particles are prepared by solvothermal method. It is found that the volume ratio of ethylenediamine(EN) in water determines the sample's final shape; among the reacted range, the particle diameter increases while the reaction time increase; reaction temperature does little to the crystal type, crystallinity, size and shape of the sample; the filed ratio of solvent has no effect on crystal type and crystallinity, however, it affects the sample's size and shape very much.2. Mn ions were successfully introduced to the crystal lattice of CdS nanorods, and the luminescence ascribed to the 4T1→6A1 of Mn was observed. The effects of Mn concentration, reaction temperature, reaction time and different ratio of sulfur source...