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Selective Crystallization of Four Tungstates (La2W3O12, La2W2O9, La14W8O45, and La6W2O15) via Hydrothermal Reaction and Comparative Study of Eu3+ Luminescence
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-05-18 00:00:00 , DOI: 10.1021/acs.inorgchem.8b00807 Xiaofei Shi 1, 2, 3 , Zhihao Wang 1, 2, 3 , Toshiaki Takei 4 , Xuejiao Wang 5 , Qi Zhu 1, 2 , Xiaodong Li 1, 2 , Byung-Nam Kim 3 , Xudong Sun 1, 2, 6 , Ji-Guang Li 1, 2, 3
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-05-18 00:00:00 , DOI: 10.1021/acs.inorgchem.8b00807 Xiaofei Shi 1, 2, 3 , Zhihao Wang 1, 2, 3 , Toshiaki Takei 4 , Xuejiao Wang 5 , Qi Zhu 1, 2 , Xiaodong Li 1, 2 , Byung-Nam Kim 3 , Xudong Sun 1, 2, 6 , Ji-Guang Li 1, 2, 3
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Hydrothermal reaction at 200 °C was systematically undertaken in wide ranges of solution pH (4–13) and W/La molar ratio (R = 0.5–2), without using any organic additive, to investigate the effect of hydrothermal parameter on product property and the underlying mechanism. Combined analysis by X-ray diffraction (XRD), inductively coupled plasma (ICP) spectroscopy, elemental mapping, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that either a decreasing pH or increasing R value yielded a product richer in W and, conversely, richer in La. The results were interpreted from the solution chemistry of La3+ and tungstate ions. As an outcome of our 40 well-designed experiments, four La tungstates—La2W3O12, La2W2O9, La14W8O45, and La6W2O15—were successfully obtained in a phase-pure form by calcining their hydrothermal precursors. Phase and morphology evolution, structure features, and properties of Eu3+ emission were, for the first time, comparatively investigated for the four compounds. Spectral analysis found that the 5 at. % Eu3+-doped La2W3O12 phosphor exhibits the highest quantum efficiency (∼47%), more red component, and the shortest fluorescence lifetime of luminescence (∼0.72 ms).
中文翻译：
通过水热反应选择性结晶四种钨酸盐（La 2 W 3 O 12，La 2 W 2 O 9，La 14 W 8 O 45和La 6 W 2 O 15）和Eu 3+发光的比较研究
在不使用任何有机添加剂的情况下，系统地在200°C的水热反应中对溶液pH（4–13）和W / La摩尔比（R = 0.5–2）的宽范围进行了研究，以研究水热参数对产品性能的影响以及潜在的机制。通过X射线衍射（XRD），电感耦合等离子体（ICP）光谱，元素图谱，扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行的综合分析表明，降低pH值或提高R值会产生更丰富的W，反之则富含La。结果由La 3+和钨酸根离子的溶液化学解释。经过40个精心设计的实验的结果，四个La钨酸盐-La 2 W通过煅烧它们的水热前体，成功地以纯相形式获得了3 O 12，La 2 W 2 O 9，La 14 W 8 O 45和La 6 W 2 O 15。首次对这四种化合物的相和形貌演化，Eu 3+发射进行了结构比较和性质研究。光谱分析发现5处。％Eu 3+掺杂的La 2 W 3 O 12 荧光粉显示出最高的量子效率（〜47％），更多的红色成分和最短的发光荧光寿命（〜0.72 ms）。
更新日期：2018-05-18
中文翻译：
通过水热反应选择性结晶四种钨酸盐（La 2 W 3 O 12，La 2 W 2 O 9，La 14 W 8 O 45和La 6 W 2 O 15）和Eu 3+发光的比较研究
在不使用任何有机添加剂的情况下，系统地在200°C的水热反应中对溶液pH（4–13）和W / La摩尔比（R = 0.5–2）的宽范围进行了研究，以研究水热参数对产品性能的影响以及潜在的机制。通过X射线衍射（XRD），电感耦合等离子体（ICP）光谱，元素图谱，扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行的综合分析表明，降低pH值或提高R值会产生更丰富的W，反之则富含La。结果由La 3+和钨酸根离子的溶液化学解释。经过40个精心设计的实验的结果，四个La钨酸盐-La 2 W通过煅烧它们的水热前体，成功地以纯相形式获得了3 O 12，La 2 W 2 O 9，La 14 W 8 O 45和La 6 W 2 O 15。首次对这四种化合物的相和形貌演化，Eu 3+发射进行了结构比较和性质研究。光谱分析发现5处。％Eu 3+掺杂的La 2 W 3 O 12 荧光粉显示出最高的量子效率（〜47％），更多的红色成分和最短的发光荧光寿命（〜0.72 ms）。
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