Absorption spectra of the samples heat-treated during different times. The broadband centered at ≈490 nm is due to the SP resonances in the metallic nanostructures.
Luminescence spectra for excitation at 355 nm. The corresponding heat-treatment time is indicated.
Energy level scheme of and ions. The solid lines represent radiative transitions. Dotted lines represent phonon relaxation processes. Dashed lines represent CR and ET processes.
Integrated luminescence intensity for transitions and as a function of the heat-treatment time .
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