Abstract
A remarkably enhanced yellow–green photoluminescence (PL) was observed from ZnO nanocrystals infiltratedinto SiO2 opal photonic crystals. It was clearly visible to the naked eye underthe excitation of an Xe lamp and had substantially improved thermalstability over pure ZnO nanocrystals. The PL spectrum shape of aZnO–SiO2 composite opal can be modified by annealing anSiO2 opal orchoosing an SiO2 opal with different lattice parameters. The enhancement of PL intensityis interpreted based on the dependence of the PL intensity on the size ofSiO2 microspheres as well as the anisotropy of the photoluminescence excitation (PLE) spectra.Our results may be interesting for further application.
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