Luminescence and energy transfer mechanisms in photo-thermo-refractive glasses co-doped with silver molecular clusters and Eu³⁺

Abstract

Silver molecular clusters were synthesized in photo-thermo-refractive glasses using the Na+–Ag+ ion exchange technique followed by heat treatment.

The Role of Thermally Activated Quenching and Energy Migration in Luminescence of Silver Clusters in Glasses

“…The increase in silver concentration leads to a red-shift of the long-wavelength luminescence edge and a decrease in the intensity of short-wavelength shoulder in the spectra. This short-wavelength band in the luminescence spectra of silver clusters in glass was shown to be related to fluorescence, while long-wavelength emission corresponds to phosphorescence . Time-resolved spectra measurement shows that fluorescence part of the cluster emission demonstrates the gradual appearance of an additional band with increase in silver concentration (Figure b).…”

“…This short-wavelength band in the luminescence spectra of silver clusters in glass was shown to be related to fluorescence, while long-wavelength emission corresponds to phosphorescence. 15 Time-resolved spectra measurement shows that fluorescence part of the cluster emission demonstrates the gradual appearance of an additional band with increase in silver concentration (Figure 2b). Phosphorescence spectra also show concentration red-shift, although there is no clear appearance of new bands (Figure 2c).…”

“…Luminescence spectra and time-resolved luminescence spectra were measured with a PerkinElmer LS50B fluorometer; spectra were corrected for the sensitivity of the detector. The method for separation of fluorescence and phosphorescence was described in our previous paper . To obtain the temperature dependence of luminescence spectra from 93 to 473 K, a Specac cryostat was connected to a PerkinElmer LS50B fluorometer with optical fibers.…”

“…The method for separation of fluorescence and phosphorescence was described in our previous paper. 15 To obtain the temperature dependence of luminescence spectra from 93 to 473 K, a Specac cryostat was connected to a PerkinElmer LS50B fluorometer with optical fibers. Fluorescence decay kinetics were measured by a HORIBA Fluorolog-3 fluorometer; a pulsed LED with peak wavelength of 340 nm and 1.2 ns pulse time was used as an excitation source.…”

Three-Dimensional High Spatial Localization of Efficient Resonant Energy Transfer from Laser-Assisted Precipitated Silver Clusters to Trivalent Europium Ions

“…Femtosecond laser inscription in rare earth doped silver-containing glasses clearly demonstrates the effect of the silver cluster on the enhancement of europium ions and allows for writing 3D localized intense tunable emission patterns from red to white for a broad excitation spectrum in inorganic materials. This approach could be extended to other rare earth doped photosensitive glasses, including photo-thermo-refractive glasses [31], to promote 3D high-contrast luminescent patterns in various spectral ranges.…”