White luminescence from sol–gel silica doped with silver

Abstract

Undoped silica and Ag-doped silica (SiO 2 ) were synthesized by the sol-gel method. The photoluminescence properties as a function of annealing temperature were investigated in detail. The addition of Ag introduced new optical active centres in the sample annealed at 1000°C, responsible for emission bands at 2.25 eV (550 nm) and 3.26 eV (380 nm) in the SiO 2 luminescence spectrum. These new emission bands were related to excess oxygen due to decomposition of Ag 2 O at high temperatures. The additional luminescence band at 2.25 eV changed the blue emission from pure SiO 2 to near white light from Ag-doped SiO 2 , suggesting that the SiO 2 :Ag system may be suitable for solidstate lighting applications. The stability of this phosphor under ultraviolet irradiation was investigated. Graphical Abstract

Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology

“…36-1451) and the FCC phase of Ag (ICSD no. 52362). ,− No additional peaks related to impurities were observed, indicating the high purity of the samples. It is seen that for ZnO/Ag nanohybrids, the (101) characteristic peak of the ZnO moves to lower angles (at lower Ag concentrations up to 15 AZ) when compared to pure ZnO (see in Figure S1a).…”