Nano-sized hexagonal platelet-like ZnO for the nano-phosphor application

In this presentation, a facile method has been developed to produce large quantities of ZnO nanocrystals with hexagonal shape. In the presence of sodium bis (2-ethylexyl) sulfosuccinate (AOT) emulsions as a structure-direct agent, the reaction of hexamethylenetetramine (HMT) in Zn²⁺ aqueous solution forms ZnO phosphors. Second, both micro-sized and nano-sized platelet-like ZnO nanocrystals have been produced by the control of the reaction conditions. Third, the luminescent properties of as-prepared and annealed powders have been characterized by both cathodoluminescence and photoluminescence. Finally, the micro-sized ZnO platelet has been characterized by a pulsed YAG laser. With the increase of the laser intensity, the emission shows nonlinear phenomena, which indicates that the lasing action occurs in the sample.