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For transparent low melting inorganic glass, which is relevant for sealing and additional applications, Pb‐containing glasses have reached the lowest melting point and best comprehensive performance. Considering potential toxicity and regulatory limitations, there is urgent need to develop Pb‐free ultra‐low melting point glass. Herein, we systemically investigated the structure and luminescence evolution of the Pb‐free ultra‐low melting quaternary tin fluorophosphate glasses (NaF‐SnF2‐SnO‐P2O5), in which varied NaF content was tuned to affect the properties of glass. With NaF content increases, the Sn‐O and P‐O bonds have been gradually transformed to Sn‐F and P‐F bonds, and the phosphrous tetrahedron PO4 has been converted to PO3F. The weaken bonding results in the decrease of the ultra‐low melting point to 329°C when NaF increased to 15 a.t.%, 29oC lower than the ternary glass. The blue shifts of both absorption and photoluminescence spectra were observed due to the higher ionic character of glass structure with NaF increases. As reported previously in the ternary tin fluorophosphate glass, the quaternary glass system also shows a phosphorescence behavior (∼1 s) due to the existence of oxygen vacancies. Additionally, the changes in oxygen vacancy defects correlate with the NaF content, thus affecting the decay time as well. The ultra‐low melting point luminescent quaternary tin fluorophosphate glasses (NaF‐SnF2‐SnO‐P2O5) may be relevant for opto‐electronic applications such as the packaging in displays or light‐emitting diodes. [ABSTRACT FROM AUTHOR]

Er3+-doped transparent perfluoride composite glass (PFCG) containing SrF 2 crystals was obtained by a one-step method. PFCG was observed to maintain the formation of a single SrF 2 crystal phase even when the Er3+ doping concentration was as high as 8 mol%. Importantly, Er3+ was enriched in the crystalline region, which promoted grain growth. This ensures effective emission of upconversion (UC). Interestingly, green and red UC emissions were found to be tunable in the range of 1–6 mol% Er3+ doping, and the UC emission and lifetime started to produce concentration quenching until 6 mol% Er3+ doping. To the best of our knowledge, this is the highest quenching concentration of Er3+ in composite-glass materials. Moreover, the dominant UC process was systematically analyzed at different doping levels. This research is expected to provide ideal candidate materials and appropriate Er3+ concentration doping level guidance in PFCG for the field of UC lasers. [ABSTRACT FROM AUTHOR]

For transparent low melting inorganic glass, which is relevant for sealing and additional applications, Pb‐containing glasses have reached the lowest melting point and best comprehensive performance. Considering potential toxicity and regulatory limitations, there is urgent need to develop Pb‐free ultra‐low melting point glass. Herein, we systemically investigated the structure and luminescence evolution of the Pb‐free ultra‐low melting quaternary tin fluorophosphate glasses (NaF‐SnF2‐SnO‐P2O5), in which varied NaF content was tuned to affect the properties of glass. With NaF content increases, the Sn‐O and P‐O bonds have been gradually transformed to Sn‐F and P‐F bonds, and the phosphrous tetrahedron PO4 has been converted to PO3F. The weaken bonding results in the decrease of the ultra‐low melting point to 329°C when NaF increased to 15 a.t.%, 29oC lower than the ternary glass. The blue shifts of both absorption and photoluminescence spectra were observed due to the higher ionic character of glass structure with NaF increases. As reported previously in the ternary tin fluorophosphate glass, the quaternary glass system also shows a phosphorescence behavior (∼1 s) due to the existence of oxygen vacancies. Additionally, the changes in oxygen vacancy defects correlate with the NaF content, thus affecting the decay time as well. The ultra‐low melting point luminescent quaternary tin fluorophosphate glasses (NaF‐SnF2‐SnO‐P2O5) may be relevant for opto‐electronic applications such as the packaging in displays or light‐emitting diodes. [ABSTRACT FROM AUTHOR]

Intense room-temperature terbium photoluminescence, with well-resolved optical bands corresponding to electron transitions 5 D 4 → 7 F j (j = 3–6) was observed from mesoporous AlPO 4 glass after immersion in solutions of terbium nitrates and subsequent heat treatment. The modification of Tb ions for the AlPO 4 network structure is revealed by XPS spectra. The PL mechanism of the formed nanocomposite is discussed through the effects of Tb concentration and excitation wavelength. Our results indicate that the mesoporous AlPO 4 glass is a suitable matrix to incorporate rare earth ions as the light emitting material. [ABSTRACT FROM AUTHOR]