Photoluminescence and Thermoluminescence of Phosphate Glasses Doped with Dy3+ and Containing Silver Nanoparticles

Abstract

Phosphate glasses doped with Dy[Formula: see text] ions and containing silver nanoparticles (SNPs) were synthesized in the present work. We report photoluminescence characterization by absorption and emission spectra. The effect of Ag concentration on the thermoluminescence (TL) glow curves was studied. The scanning electron microscopy (SEM) shows the formation of SNP. Absorption spectra of the samples show the influence of the SNP in the bands 350[Formula: see text]nm at 425[Formula: see text]nm associated with the Dy[Formula: see text], in the same spectra we can see the bands 750, 800, 875, 1098, 1278[Formula: see text]nm and 1675[Formula: see text]nm belonging to the Dy[Formula: see text]. Emission spectra show two prominent bands at 480[Formula: see text]nm and 574[Formula: see text]nm and one faint band at 665[Formula: see text]nm corresponding to 4F[Formula: see text]H[Formula: see text], 4F[Formula: see text]H[Formula: see text] and 4F[Formula: see text]H[Formula: see text] transitions, respectively. All bands under 364[Formula: see text]nm pumping, and the fluorescence in the 550[Formula: see text]nm and 590[Formula: see text]nm spectral range enhanced four times. The Commission Internationale de 1’Eclairage (CIE) color coordinates were evaluated from the emission spectra to simulate white light emission from the phosphate glasses. The photostability of the samples was also studied in the UVA (315–403[Formula: see text]nm) and UVB (280–315[Formula: see text]nm) ranges. TL due to ultraviolet radiation (UVR) was studied; the glow curves show significant dependence of the TL intensity with the increment of SNPs in the samples. These results show the phosphate glasses doped with Dy[Formula: see text] and containing SNP as a potential candidate have to be used in solid-state illumination and retrospective dosimetry.

Ascorbic acid stabilised copper nanoclusters as fluorescent sensors for detection of quercetin

“…Metal nanoclusters (MNCs) as a novel uorescent material have been applied to detect toxic substances owing to excellent optical properties, stability and biocompatibility. [12][13][14][15][16] To date, a variety of metal nanoclusters have been successfully prepared through an etching synthesis method, 17 phase transfer synthesis method, 18 microwave-assisted synthesis method, 19 sonochemical synthesis method 20 and photoreduction synthesis method, 21 using Au, Ag, Pt and Cu NCs. [22][23][24][25][26][27] Compared to Ag and Au, Cu is an easily available and low-cost metal.…”