Capillary force assisted self-assembly of Au NPs arrays for up-conversion luminescence enhancement

Using the capillary force-assisted self-assembly method, the enhancement system for photoluminescence was simply and effectively constructed, consisting of a layer of Au nanoparticle arrays uniformly assembled on the inner wall of the capillary and a further layer of hexagonal rare-earth doped nanoparticle core-shell structures assembled on its surface. It was found that the solution had a significant effect on the self-assembly process of the enhanced system, and the use of anisole as a solvent was more conducive to the construction of a homogeneous rare-earth doped nanoparticle film. In addition, the density of Au nanoparticles also modulated the enhancement effect of up-conversion luminescence and the optimal particle density conditions were determined by comparison. And the overall enhancement effect of surface plasmon resonance assisted up-conversion luminescence was analyzed in terms of the correlation of photoluminescence with the changes in excitation intensity and emission lifetime, as well as the significant increase in the red-to-green ratio. The results contribute to the construction of effective regulatory structures for up-conversion luminescence, which has important applications in the field of spectral sensing technology.