Thermal effects on optical properties of silver ruby glass

Photoluminescence of silver in glassy matrices

“…Silver diffusion from the coatings on soda-lime glass substrates is favored by the ion exchange process, which also occurs at low temperatures, between Ag + in the coating and Na + in the substrate, with the subsequent interdiffusion of the two species in order to maintain the electrical neutrality of the glass. 4,5,8 This result is consistent with the PL spectra, which exhibit the emission band characteristic of the presence of Ag + . With silica substrates, the silver concentration gradient may be the main driving force for silver diffusion from the coating to the substrate.…”

“…In particular, for silica-based glassy matrices, emission takes place between 300 and 450 nm, depending on the network nature and composition. [5][6][7][8][9][10][11][12][13][14] In contrast, no PL emission due to Ag 0 atoms has been reported to the best of our knowledge.…”

“…In this respect, Pivin recently found a very faint PL emission from Ag + in pure silica 29 in Ag-implanted samples (the implantation process can break some bonds, creating nonbridging oxygen). Furthermore, PL measurements with time resolution carried out on silver ruby glass 30 pointed towards a possible donor-acceptor pair that is responsible for PL emissions ascribed to the presence of Ag + in glasses.…”

“…[1][2][3][4][5][6][7][8][9][10] For instance, the incorporation of isolated metal ions (mainly Ag + and Cu + ) in glass gives rise to an intense photoluminescence (PL) emission, which is potentially useful for optoelectronic applications, and a concurrent change in the refraction index with the consequent formation of light waveguides. [11][12][13][14][15][16][17][18][19][20] On the other hand, the metal ions may be reduced, causing them to aggregate and form metal nanoparticles that exhibit other interesting optical properties such as high nonlinear susceptibility, optical absorption ascribed to plasmon resonances, and so on.…”

Study of color and structural changes in silver painted medieval glasses

“…Similar conclusions can be applied to silver and copper. The reducing conditions can be achieved by a reducing atmosphere or by the presence of reducing agents (such as SnO or Sb 2 O 3 ) in the glass composition [14]. On the other hand, different works [13,[15][16][17] have also demonstrated that the incorporation of ionic silver into the vitreous structure by means of the ionic exchange processes can cause important structural alterations in the glass.…”