Spectral-Luminescent Properties of Nanocomposite Materials Based on Porous Silicate Glasses Doped by Silver and Copper Bromides

A series of nanocomposite materials (NCMs) doped by silver and copper bromides are synthesized based on high-silica porous glasses (PG matrices). The concentrations of silver and copper oxides in the synthesized samples are 0.32–1.06 wt % Ag2O and 0.005–0.025 wt % CuO, respectively. The samples are thermally treated in a wide temperature range of 120–750°C. It is found that samples of the 100Ag/10Cu series (120°C) exhibit blue–green (λlum = 424–560 nm), yellow–orange (λlum = 584–588 nm), and red (λlum = 658–732 nm) luminescence. A study is conducted using the method of near infrared spectroscopy in the frequency range 7500–4000 cm–1. It is found that the dehydroxylation of the NCM surface and an increase in the transmittance in the entire specified frequency range occur with an increase in the temperature. The NCM samples have absorption bands in the range of 4190–4171 cm–1, which are caused by the absorption of Cu2+ ions. Energy-dispersive X-ray spectroscopy shows that the porous structure of the PG matrix has an effect on the concentration distribution of elements over the thickness of the samples.