Effect of solution concentration on the morphology and photoluminescence of ZnO nanorods

In order to prepare high-quality,high-orientation,high-density,well-aligned ZnO nanorods,firstly,ZnO seed layers were prepared on glass substrates by means of pulsed laser deposition(PLD),then ZnO nanorods were prepared on the glass substrates with hydrothermal method.The role of the seed layer was explored and effects of different solution concentration on structure and photoluminescence(PL)properties of ZnO nanorods were investigated.The morphology and structure of the samples were measured by scanning electron microscope(SEM) and X-ray diffraction(XRD).The PL spectra of the workpieces were measured with an established photoluminescence test system.SEM and XRD results show that ZnO nanorods have highly orientation,distribution compact uniform.The excitons emission is slightly lower than the deep level luminescence.As the solution concentration increasing,the ratio of exciton and deep level luminescence relative intensity decreases in order.