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Metal nanoparticle (NP) surface coatings are known to significantly enhancethe ultra-violet luminescence intensity of ZnO. Although there is generalagreement that resonantly excited Localized Surface Plasmons (LSPs) in metalNPs can directly couple to excitons in the semiconductor increasing theirspontaneous emission rate, the exact mechanisms involved in this phenomenon arecurrently not fully understood. In this work, LSP-exciton coupling in a ZnOsingle crystal and ZnO nanorods coated with a 2 nm Al layer has beeninvestigated using correlative photoluminescence and depth-resolvedcathodoluminescence and time-resolved photoluminescence spectroscopy.Temperature-resolved cathodoluminescence and photoluminescence measurementsfrom 10 K to 250 K show enhancement factors up to 12 times of the free exciton(FX) emission at 80 K. The FX couple more efficiently to the LSPs in Alcompared to the localized donor-bound excitons. Furthermore, a strongpolarization dependence of the LSPs with respect to the FX was observed withhigher enhanced FX transitions polarized in the same direction as the electricfield of the incident excitation. These results indicate that selectiveenhancement of the ultra-violet excitonic PL in ZnO can be achieved by carefulalignment of the crystallographic axes of the ZnO relative to the electricvector of the excitation source.

Correlative Study of Enhanced Excitonic Emission in ZnO Coated with Al Nanoparticles using Electron and Laser Excitation