LAUSR

We measure the phase-dependent spectroscopic signatures—photoluminescence (PL) emission spectrum, PL excitation spectrum, and PL lifetime—of three different heat treated Dy3+-doped oxide precursors (TiO2, Y2O3, and ZrO2), which are calcined at temperatures ranging from 440 to 1256 K for 100 ms. On the basis of these spectroscopic measurements we compute temperature calibration curves, which correlate a given spectroscopic signature to a specific calcination temperature. We find that the emission/excitation spectra-based calibration curves for a given material, in general, have the same transition temperature within uncertainty, but the lifetime-based calibration curve is found to transition at a lower temperature. This difference is due to the emission/excitation-based curves depending on crystallization of the oxide hosts, while the lifetime changes due to the decomposition of the precursor compound, which eliminates some PL quenchers, including high energy O–H, C–O, and C–O2 vibrations. The observation ...