  The development of enhanced optical devices relies on key materials
properties. In this context, researchers have investigated the effects of metal
nanoparticles incorporation in active rare-earth materials. Here, we discuss
the effects of Silver nitrate addition 0.5%, 1.0% and 2.0% mol%) into a Pr3+
doped tellurite-tungstate glasses (TWNN) formed by the conventional
melt-quenching technique. The XRD curves confirmed the amorphous structural
nature of TWNN glasses. The FTIR spectra identified the presence of different
vibrational groups. DSC curves verified the increase around 70 oC for thermal
stability with silver addition. Absorption spectra observed surface plasmon
resonance (SPR) band around 500 nm. Luminescence measures shows enhanced and
quenching for Pr3+ transitions under the 473 nm excitation. The band around
480-520 nm are more affected by SPR band by quenching, and the bands around
575-675 nm are luminescence emission increased due to the presence of silver
nanoparticles. In addition, lifetime decays as a function of heat treatment
time, has also been verified. The Ag enhances the lifetime regarding the
samples annealed by 20 hours and as the Ag concentration increases, the
lifetime stretches as well. The present results shows that Pr3+-Ag codoped TWNN
glass lead to some remarkable improvement, verified in properties such as
lifetime constants or emissions intensities and is a promising candidate for
photonic devices.
