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[(a)–(d)] Schematic diagrams depicting the fabrication process of the nitride-based nanopillars. (e) FESEM image showing nanopillars array across the nitride sample. In the close-up image shown in the inset of (e), nanopillars of high aspect ratio can be clearly resolved.
PL spectra of the as-groan and nanopillar sample taken at room temperature. The curves are normalized and shifted in the -axis for better comparison.
The emission spectra under different excitation density for the nanopillar sample. Figure in the inset shows the dependence of the PL integrated intensity on the laser excitation density.
The reflectance spectra of the nanopillar sample together with the emission spectra under different excitation densities.
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