Investigation of luminescence properties of Eu-doped Si-Al-O-N glasses synthesized via sol-gel process

Assessment of the Crystallization Process of CaO–Al2O3–SiO2 Glass Probed with Tb3+ Luminescence

“…The parent CAS-H glass appeared black in color because of the presence of metallic Mo particles, in good agreement with a previous report, while the CAS-Eu was yellowish (Figure S1a,b). The Eu 2+ -doped glass produced in prior study also had a yellow color . The fluorescence spectrum of the CAS-Eu parent glass (Figure S1c) exhibited a broad emission band at approximately 470 nm resulting from Eu 2+ ions .…”

“…The Eu 2+ -doped glass produced in prior study also had a yellow color. 27 The fluorescence spectrum of the CAS-Eu parent glass (Figure S1c) exhibited a broad emission band at approximately 470 nm resulting from Eu 2+ ions. 27 Reflections attributed to metastable CaAl 2 Si 2 O 8 20 were observed in the XRD pattern obtained from the CAS-H, in agreement with a previous report, which were absent from the XRD pattern generated by the CAS-Eu (Figure S2).…”

“…27 The fluorescence spectrum of the CAS-Eu parent glass (Figure S1c) exhibited a broad emission band at approximately 470 nm resulting from Eu 2+ ions. 27 Reflections attributed to metastable CaAl 2 Si 2 O 8 20 were observed in the XRD pattern obtained from the CAS-H, in agreement with a previous report, which were absent from the XRD pattern generated by the CAS-Eu (Figure S2). This result suggests that Eu 3+ ions were preferentially reduced to Eu 2+ by carbon in the glass instead of MoO 3 during the melting stage.…”

Effect of carbon on the co-presence of metallic tungsten as a nucleation agent and Eu2+ in glass: crystallization of CaO–Al2O3–SiO2 glass probed with Eu2+ luminescence

“…3), suggesting that both metallic W particles and Eu 3+ ions in W-Eu-Glass-4.0C exhibit a greater reduction efficiency than those in W-Eu-Glass-normal. However, the blue coloration due to Eu 2+ fluorescence 32 under 254 nm irradiation was not visually distinguished between the glass specimens before and after crystallization (Fig. 2, middle).…”

“…Given the absence of dark coloration in the yellowish W-Eu-Glass-0C (Fig. 2) whose color is the same as that of Eu 2+ -doped glass specimens, 10,32,33 the carbon added during the remelting process suppressed the oxidation of both metallic W particles and Eu 2+ ions in the mixed Cullet-W and Cullet-Eu 2+ (Fig. 1), respectively.…”