Absorption spectra of codoped samples containing silver NPs for various heat-treatment times.
Emission spectra of codoped samples containing silver NPs obtained by pumping the samples with a diode laser operating at 980 nm (≈100 mW).
Energy level scheme of and ions with indication of the luminescence observed. Dashed arrows indicate cross relaxation among excited ions. Dotted arrow indicates ET from to ions. Solid arrows represent radiative transitions.
Luminescence intensity of ions as function of the laser power for samples containing silver NPs heat treated for 1, 24, and 30 h.
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