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Accessing Mixed-Halide Upconverters Using Heterohaloacetate Precursors
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-08-12 00:00:00 , DOI: 10.1021/acs.chemmater.9b02384
K. Tauni Dissanayake 1 , Dinesh K. Amarasinghe 1 , Leopoldo Suescun 2 , Federico A. Rabuffetti 1
Affiliation  

A new type of organic–inorganic hybrid precursor to mixed-halide optical materials is described by using Ba5(CF2ClCOO)10·7H2O as an example. This heterohaloacetate belongs to the family of extended inorganic hybrids in which metal connectivity in three dimensions is achieved via metal–organooxygen–metal bridges. Thermolysis in the solid state and in solution yield crystalline BaFCl at temperatures below 300 °C. Chlorodifluoromethyl groups act as chlorine and fluorine source, making the organic moiety a de facto single-source precursor for the anionic portion of the target mixed halide. Solution thermolysis in the presence of Yb3+–Er3+ sensitizing–activator pairs yields rare-earth-doped BaFCl nanocrystals capable of NIR-to-visible photon upconversion. Analyses of the composition, morphology, structure, and luminescence of these nanocrystals demonstrate that heterohalocetates serve as dual halogen sources for mixed-halide optical materials. Findings presented in this article enlarge the synthetic toolbox to access mixed halides at temperatures compatible with solution synthesis and processing.

中文翻译:

使用杂卤代乙酸盐前体访问混合卤化物上变频器

以Ba 5(CF 2 ClCOO)10 ·7H 2 O为例,描述了一种新型的混合卤化物光学材料的有机-无机杂化前驱体。这种杂卤代乙酸盐属于扩展的无机杂化物家族,其中通过金属-有机氧-金属桥实现了三维的金属连接。固态和溶液中的热解在低于300°C的温度下产生结晶BaFCl。氯二氟甲基充当氯和氟源,使有机部分成为目标混合卤化物阴离子部分的事实上的单源前体。Yb 3+ -Er 3+存在下的溶液热解敏化活化剂对产生稀土掺杂的BaFCl纳米晶体,能够将NIR转换为可见光子。对这些纳米晶体的组成,形态,结构和发光的分析表明,杂卤化物用作混合卤化物光学材料的双卤素源。本文提供的发现扩大了合成工具箱,可在与溶液合成和处理兼容的温度下接触混合卤化物。
更新日期:2019-08-12
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