Yingling Yang

Correlation between 577cm−1 Raman scattering and green emission in ZnO ordered nanostructures

We have investigated resonant Raman scattering (RRS) and photoluminescence of ZnO inverse opal prepared by electrodeposition. The intensities of both 577cm−1 Raman scattering and green emission get weaker after aging or UV laser irradiation. The RRS and green emission intensities are highly correlated for different samples, regardless of the means of sample treatment. According to the deposition-temperature and annealing-temperature dependences, we propose that the origins of the two peaks are related to surface hydroxide.

Enhanced yellow–green photoluminescence from ZnO–SiO2 composite opal

A remarkably enhanced yellow–green photoluminescence (PL) was observed from ZnO nanocrystals infiltrated into SiO2 opal photonic crystals. It was clearly visible to the naked eye under the excitation of an Xe lamp and had substantially improved thermal stability over pure ZnO nanocrystals. The PL spectrum shape of a ZnO–SiO2 composite opal can be modified by annealing an SiO2 opal or choosing an SiO2 opal with different lattice parameters. The enhancement of PL intensity is interpreted based on the dependence of the PL intensity on the size of SiO2 microspheres as well as the anisotropy of the photoluminescence excitation (PLE) spectra. Our results may be interesting for further application.