In this study, we propose a novel strategy to reduce Eu 2 O 3 to Eu 2+ in the 34.88P 2 O 5 -13.57B 2 O 3 -34.88ZnO-16.67KBr (PBZB) glass system by introducing (NH 4 ) 2 HPO 4 as a reducing phosphorus source. Photoluminescence (PL), photoluminescence excitation (PLE) spectral and UV–Vis absorption spectral analyses revealed that the emission peak at 325 nm excitation originates from the 4f 6 5d 1 → 4f 7 transition of Eu 2+ , confirming the reduction efficacy of (NH 4 ) 2 HPO 4 . Furthermore, incorporating 7.14 % Mn 2+ into PBZB glass and adjusting the concentration of Eu 2 O 3 demonstrated that Eu 2+ doping significantly enhances the red emission of Mn 2+ at 630 nm. Specifically, when the Eu 2 O 3 concentration is 0.12 mol%, the Mn 2+ emission intensity reaches its peak, with a 32.6 % increase in photoluminescence quantum yield (PLQY). However, further increasing the Eu 2 O 3 concentration leads to a decrease in Mn 2+ emission intensity and the appearance of Eu 3+ emission peaks, indicating a limited reduction capacity. Emission spectrum analysis showed a Eu 3+ reduction rate of 76.09 %. The effective energy transfer mechanism from Eu 2+ to Mn 2+ was verified through spectral overlap and decay curve analysis, with calculated energy transfer efficiency being similar to the PLQY increment. This study simplifies the Eu 3+ reduction process and provides a new method for optimizing Mn 2+ red emission in glass.
Xiaoyun Qiu,Zhaochu Hu,Tao Luo,Tao He,Wen Zhang,Ming Li,Zhenli Zhu,Lijin Huang,Mingxing Gong
Preparation of homogeneous and mechanically resistant targets is essential for representative bulk analysis using laser ablation–inductively coupled plasma mass spectrometry (LA-ICP-MS). Fused glasses are preferred (for LA-ICP-MS) over pressed powder pellets owing to their greater homogeneity. However, their use is often limited by the loss of Pb and Zn during the fusion process. In this study, a novel and rapid (NH4)2HPO4–LiBO2 fusion technique using a homemade fusion furnace and graphite crucibles was established for determining major and trace elements in silicate rocks by LA-ICP-MS. Homogenous glasses were produced by fusing a mixture of ~50 mg of silicate rock powders, 10 mg of (NH4)2HPO4, and 100 mg of LiBO2 at 950 °C for 5 min in a closed fusion system. This approach ensures the complete dissolution of refractory minerals such as zircon and effectively suppresses the loss of volatile elements such as Pb and Zn. The use of a 100% oxide normalization calibration strategy provided accurate results, enabling the direct analysis of unknown samples without any prior determination of internal standard element mass fractions. Analytical results for most elements in five silicate rock reference materials generally agreed with the reference values, within 10% deviation. Precision was achieved within 5% relative standard deviation (RSD) for major elements and 10% RSD for most trace elements. The developed method is simple, rapid, and efficient, addressing the challenges of volatile element loss and incomplete dissolution of refractory minerals, which significantly benefits the application of LA-ICP-MS for bulk silicate rock analysis.
危险品化学品经营许可证（带存储）