The influence of potassium substitution for barium on the structure and property of silver-doped germano-gallate glasses

Laser Direct Writing of Silver Clusters‐Based Subwavelength Periodic Structures Embedded in Mid‐Infrared Gallo‐Germanate Glass

“…In both glasses, several wavelengths of emissions and excitations have been investigated, but only two fixed wavelengths both in emissions ( λ emi = 350 and 450 nm) and in excitations ( λ exc = 270 and 320 nm) have been selected where the spectral differences appear to be the most significant corresponding to at least two major silver entities. [ 45 ] The corresponding results are presented in Figure a,b for GGBK and BGGK glasses, respectively. In both glasses, the fluorescence spectrum under excitation at 270 nm reveals large bands with intensities and locations that are composition dependent.…”

“…Such kind of glass structure interpretation is highly supported by the previous work of McKeown and Merzbacher, where the BGGK counterpart of their study without potassium and silver has presented the relatively same Raman spectrum and interpretation. [ 47 ] Moreover, considering our previous work on silver‐doped GGBK glasses with the substitution of four different barium contents (i.e., 0, 5, 10, and 15 mol%) [ 45 ] and as long as the (2Ba 2+ + K + )/Ga 3+ ratio is superior to 1, one can clearly attribute to the barium ion the role of network depolymerizing agent. Thus, regarding the drastic change of the cationic composition of both glasses, a gallo‐germanate polymerized glass network and a bario‐germanate depolymerized glass network are considered for the GGBK and BGGK glasses, respectively.…”

“…The steady-state and time-resolved spectrofluorometries of silver doped-gallo-germanate glasses with close composition up to 15 mol% of barium, such as in the GGBK glass, have already been published elsewhere. [45] In this latter paper, the reported luminescence has been assigned not only to silver entities in different composition sites, such as [GaO 4 ] À and [GeØ 3 O À ], but also with different nuclearities, such as isolated and aggregated silver species. In BGGK, the spectral distribution is highly similar to that of GGBK glass, with the existence of nanosecond and microseconds decay times.…”

“…From our previous work on the quaternary glass system Ga 2 O 3 -GeO 2 -BaO-K 2 O, [45] it has been highlighted that the presence of alkali and alkali-earth ions allows for the generation of NBOs, while alkali ions help significantly to increase the cation mobility in the glass. As for silver-doped phosphate glasses, [32,38,39] the amount of NBOs does also significantly influence the photosensitivity of BGG glasses.…”

“…In both glasses, several wavelengths of emissions and excitations have been investigated, but only two fixed wavelengths both in emissions (λ emi ¼ 350 and 450 nm) and in excitations (λ exc ¼ 270 and 320 nm) have been selected where the spectral differences appear to be the most significant corresponding to at least two major silver entities. [45] The corresponding results are presented in and locations that are composition dependent. In the bariumpoor glass, the maximal intensity is reached at 440 nm with the presence of a contribution at 350 nm, whereas in the barium-rich glass, the maximal intensity peaks at 490 nm without any contribution at 350 nm.…”