Absorption spectra of doped samples containing NPs for various heat-treatment times.
TEM image of the sample annealed during 62 h. The inset shows the electron diffraction pattern of the silver NPs.
(a) Emission spectra of doped samples containing silver NPs for different annealing times (excitation wavelength: 377 nm). (b) Simplified energy level scheme of ion with indication of the luminescence transitions observed. The dashed line indicates nonradiative decay to level followed by cross-relaxation among excited ions and neighbors in the ground state according to .
Normalized integrated intensity ratio between the luminescence at 550 and at 485 nm as a function of the annealing time.
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