Thermal behavior of precursors for synthesis of Y2SiO5:Ce phosphor via gel combustion
Thermal behavior of precursors for synthesis of Y2SiO5:Ce phosphor via gel combustion
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DOI：
10.1007/s10973-014-4315-0
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发表时间：
2015-03
影响因子：
4.4
通讯作者：
L. Muresan;A. Cadiș;I. Perhaita;O. Ponta;D. Silipas
中科院分区：
文献类型：
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作者：
L. Muresan;A. Cadiș;I. Perhaita;O. Ponta;D. Silipas
从硝酸钇-铈、TEOS 和不同的燃料（即苏氨酸、精氨酸、柠檬酸和甘氨酸）开始，通过凝胶燃烧制备了不同类型的前体。将前驱体在氮气或空气气氛中于 1400°C 下烧制，以获得具有 X2-单斜晶结构的铈激活 (Y2SiO5:Ce) 荧光粉。使用热分析研究（TG-DTG-DTA）证实了前体加热过程中涉及的过程。使用 TG/DTA-FT-IR 耦合建立了热处理过程中热分解步骤、质量损失和逸出气体成分之间的相关性。用苏氨酸、精氨酸和甘氨酸制备的前体具有相似的热行为，由于水合碳酸盐的分解，质量损失高达 10.0%。当燃烧发生在贫燃料（<0.79摩尔苏氨酸）或富燃料条件（>0.79摩尔苏氨酸）时，未反应的硝酸盐化合物或有机残留物分别被识别。柠檬酸在凝胶化过程中形成柠檬酸盐基化合物，对燃烧过程具有抑制作用。通过 FT-IR 振动带的变化揭示了向结晶良好的硅酸盐的转化，并通过 XRD 测量得到证实。根据数量和燃料类型，所有磷光体样品都观察到不同强度的蓝色发射。与苏氨酸燃烧产生具有最高发光特性的磷光体。
Different types of precursors were prepared by gel combustion starting from yttrium–cerium nitrate, TEOS, and different fuels (i.e., threonine, arginine, citric acid, and glycine). The precursors were fired at 1400 °C in nitrogen or air atmosphere in order to obtain cerium-activated (Y2SiO5:Ce) phosphors with X2-monoclinic structure. The processes involved during the heating of precursors were put in evidence using thermal analysis investigations (TG–DTG–DTA). Correlation between the thermal decomposition steps, mass loss, and composition of evolved gases during the thermal treatment was established using TG/DTA–FT-IR coupling. Precursors prepared with threonine, arginine, and glycine have a similar thermal behavior with a mass loss up to 10.0 %, due to the decomposition of hydrated carbonates. Unreacted nitrate compounds or organic residues have been identified when combustion occurs in fuel-lean (<0.79 mol threonine) or in fuel-rich conditions (>0.79 mol threonine), respectively. Citric acid forms citrate-based compounds during gelation process with inhibitory effect on the combustion process. The conversion to well-crystallized silicates was revealed by changes of FT-IR vibration bands and confirmed by XRD measurements. A blue emission with variable intensities was observed for all phosphor samples depending on the amount and fuel type. Combustion with threonine leads to phosphors with highest luminescent characteristics.