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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Microwave-assisted solid-state synthesis of NaRE(MO4)(2)phosphors (RE = La, Pr, Eu, Dy; M = Mo, W)
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Microwave-assisted solid-state synthesis of NaRE(MO4)(2)phosphors (RE = La, Pr, Eu, Dy; M = Mo, W)

机译：nare（mo4）（2）磷光体的微波辅助固态合成（Re = la，pr，eu，dy; m = mo，w）

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摘要

A synthetic method was developed to enable the microwave-assisted solid-state preparation of double molybdate and double tungstate scheelite-type phosphors of formula NaRE(MO4)(2)(RE = La, Pr, Eu, Dy; M = Mo, W). Starting from subgram-scale stoichiometric mixtures of metal carbonates and oxides and with the aid of granular activated charcoal as a microwave susceptor, ternary (NaEu(MO4)(2)), quaternary (NaLa0.95Eu0.05(MO4)(2)), and quinary phosphors (NaLa0.95Pr0.025Dy0.025(MO4)(2)) were obtained upon heating in a countertop microwave oven. The synthesis of crystalline and phase-pure materials required heating times ranging from 18 to 27 min, significantly shorter than those typically encountered in solid-state reactions assisted by conventional heating. Depending on chemical composition, the speed-up factor ranged from 30 to 40. More importantly, photoluminescence studies performed on the compositionally complex quinary molybdate NaLa0.95Pr0.025Dy0.025(MoO4)(2)showed that phosphors synthesized using microwave and conventional heating have nearly identical luminescence responses. The synthetic method described in this contribution is robust, fast, simple, and ideally suited for exploratory synthesis and rapid screening of group VI metalate phosphors, as well as for the preparation of binary precursors to these materials (e.g., Na(2)MoO(4)and Na2WO4).
机译：开发了一种合成方法，以使微波辅助固态制备双钼酸盐和双钨酸盐型磷酸磷酸酯的式Nare（MO4）（2）（Re = La，Pr，欧盟，Dy; M = Mo，W ）。从金属碳酸盐和氧化物的子图谱化化学计量混合物开始，借助颗粒状活性炭作为微波感受器，三元（NaEU（Mo4）（2）），季铵（NALA0.95EU0.05（MO4）（2））在在台面微波炉中加热时，获得静磷光体（NALA0.95PR0.025DY0.025（2））。结晶和相纯材料的合成所需的加热时间为18至27分钟，明显短于通过常规加热辅助的固态反应中遇到的那些。取决于化学成分，加速因子范围为30至40.更重要的是，在组合物复杂的乳酸NALA0.95PR0.025DY0.025（MOO4）（2）上进行的光致发光研究表明，使用微波和常规加热合成的磷光体具有几乎相同的发光响应。本贡献中描述的合成方法是坚固，快速，简单，理想的，适用于VI金属酸磷群的探索性合成和快速筛选，以及制备这些材料的二元前体（例如，Na（2）Moo（ 4）和Na2WO4）。

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