Abstract
Zinc oxide has received extensive attention for its unique luminescence properties. In this paper, ZnO granular films were prepared on the Si wafer and quartz substrate by Layer-by-Layer electrostatic self-assembly method. The effect of sol concentration on particle size and photoluminescence properties was investigated. SEM images indicate that ZnO particle size increases with sol concentration improving. Absorption edge and photoluminescence peak have a red-shift with particle size increase. The emission peak shift is resulted from particle size effect and the change of oxygen vacancy concentration in surface. The luminescent property of granular film shows big difference with that of ZnO sol. This difference is related to the assembly state of ZnO nanoparticles.
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